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| 14 | <title>FFmpeg FAQ: 1. General Problems</title>
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| 42 |
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| 43 | <a name="SEC1"></a>
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| 44 | <table cellpadding="1" cellspacing="1" border="0">
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| 45 | <tr><td valign="middle" align="left">[ < ]</td>
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| 46 | <td valign="middle" align="left">[<a href="#SEC2" title="Next section in reading order"> > </a>]</td>
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| 55 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 56 | <td valign="middle" align="left">[Contents]</td>
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| 57 | <td valign="middle" align="left">[Index]</td>
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| 58 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 59 | </tr></table>
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| 60 | <h1 class="chapter"> 1. General Problems </h1>
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| 61 |
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| 62 | <hr size="6">
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| 63 | <a name="SEC2"></a>
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| 64 | <table cellpadding="1" cellspacing="1" border="0">
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| 65 | <tr><td valign="middle" align="left">[<a href="#SEC1" title="Previous section in reading order"> < </a>]</td>
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| 66 | <td valign="middle" align="left">[<a href="#SEC3" title="Next section in reading order"> > </a>]</td>
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| 67 | <td valign="middle" align="left"> </td>
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| 68 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 72 | <td valign="middle" align="left"> </td>
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| 73 | <td valign="middle" align="left"> </td>
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| 74 | <td valign="middle" align="left"> </td>
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| 75 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 76 | <td valign="middle" align="left">[Contents]</td>
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| 77 | <td valign="middle" align="left">[Index]</td>
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| 78 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 79 | </tr></table>
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| 80 | <h2 class="section"> 1.1 I cannot read this file although this format seems to be supported by ffmpeg. </h2>
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| 81 |
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| 82 | <p>Even if ffmpeg can read the file format, it may not support all its
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| 83 | codecs. Please consult the supported codec list in the ffmpeg
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| 84 | documentation.
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| 85 | </p>
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| 86 | <hr size="6">
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| 87 | <a name="SEC3"></a>
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| 88 | <table cellpadding="1" cellspacing="1" border="0">
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| 89 | <tr><td valign="middle" align="left">[<a href="#SEC2" title="Previous section in reading order"> < </a>]</td>
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| 90 | <td valign="middle" align="left">[<a href="#SEC4" title="Next section in reading order"> > </a>]</td>
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| 91 | <td valign="middle" align="left"> </td>
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| 92 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 97 | <td valign="middle" align="left"> </td>
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| 98 | <td valign="middle" align="left"> </td>
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| 99 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 100 | <td valign="middle" align="left">[Contents]</td>
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| 101 | <td valign="middle" align="left">[Index]</td>
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| 102 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 103 | </tr></table>
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| 104 | <h2 class="section"> 1.2 How do I encode JPEGs to another format ? </h2>
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| 105 |
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| 106 | <p>If the JPEGs are named img1.jpg, img2.jpg, img3.jpg,..., use:
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| 107 | </p>
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| 108 | <table><tr><td> </td><td><pre class="example"> ffmpeg -i img%d.jpg /tmp/a.mpg
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| 109 | </pre></td></tr></table>
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| 110 | <p><samp>`%d'</samp> is replaced by the image number.
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| 111 | </p>
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| 112 | <p><tt>`img%03d.jpg'</tt> generates <tt>`img001.jpg'</tt>, <tt>`img002.jpg'</tt>, etc...
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| 113 | </p>
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| 114 | <p>The same system is used for the other image formats.
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| 115 | </p>
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| 116 | <hr size="6">
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| 117 | <a name="SEC4"></a>
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| 118 | <table cellpadding="1" cellspacing="1" border="0">
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| 119 | <tr><td valign="middle" align="left">[<a href="#SEC3" title="Previous section in reading order"> < </a>]</td>
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| 120 | <td valign="middle" align="left">[<a href="#SEC5" title="Next section in reading order"> > </a>]</td>
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| 121 | <td valign="middle" align="left"> </td>
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| 122 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 123 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 124 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 125 | <td valign="middle" align="left"> </td>
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| 126 | <td valign="middle" align="left"> </td>
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| 127 | <td valign="middle" align="left"> </td>
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| 128 | <td valign="middle" align="left"> </td>
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| 129 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 130 | <td valign="middle" align="left">[Contents]</td>
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| 131 | <td valign="middle" align="left">[Index]</td>
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| 132 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 133 | </tr></table>
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| 134 | <h2 class="section"> 1.3 FFmpeg does not support codec XXX. Can you include a Windows DLL loader to support it ? </h2>
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| 135 |
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| 136 | <p>No. FFmpeg only supports open source codecs. Windows DLLs are not
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| 137 | portable, bloated and often slow.
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| 138 | </p>
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| 139 | <hr size="6">
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| 140 | <a name="SEC5"></a>
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| 141 | <table cellpadding="1" cellspacing="1" border="0">
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| 142 | <tr><td valign="middle" align="left">[<a href="#SEC4" title="Previous section in reading order"> < </a>]</td>
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| 143 | <td valign="middle" align="left">[<a href="#SEC6" title="Next section in reading order"> > </a>]</td>
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| 144 | <td valign="middle" align="left"> </td>
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| 145 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 146 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 147 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 148 | <td valign="middle" align="left"> </td>
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| 149 | <td valign="middle" align="left"> </td>
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| 150 | <td valign="middle" align="left"> </td>
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| 151 | <td valign="middle" align="left"> </td>
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| 152 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 153 | <td valign="middle" align="left">[Contents]</td>
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| 154 | <td valign="middle" align="left">[Index]</td>
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| 155 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 156 | </tr></table>
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| 157 | <h2 class="section"> 1.4 Why do I see a slight quality degradation with multithreaded MPEG* encoding ? </h2>
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| 158 |
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| 159 | <p>For multithreaded MPEG* encoding, the encoded slices must be independent,
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| 160 | otherwise thread n would practically have to wait for n-1 to finish, so it's
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| 161 | quite logical that there is a small reduction of quality. This is not a bug.
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| 162 | </p>
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| 163 | <hr size="6">
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| 164 | <a name="SEC6"></a>
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| 165 | <table cellpadding="1" cellspacing="1" border="0">
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| 166 | <tr><td valign="middle" align="left">[<a href="#SEC5" title="Previous section in reading order"> < </a>]</td>
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| 167 | <td valign="middle" align="left">[<a href="#SEC7" title="Next section in reading order"> > </a>]</td>
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| 168 | <td valign="middle" align="left"> </td>
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| 169 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 170 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 171 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 173 | <td valign="middle" align="left"> </td>
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| 174 | <td valign="middle" align="left"> </td>
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| 175 | <td valign="middle" align="left"> </td>
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| 176 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 177 | <td valign="middle" align="left">[Contents]</td>
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| 178 | <td valign="middle" align="left">[Index]</td>
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| 179 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 180 | </tr></table>
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| 181 | <h2 class="section"> 1.5 How can I read from the standard input or write to the standard output ? </h2>
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| 182 |
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| 183 | <p>Use <tt>`-'</tt> as filename.
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| 184 | </p>
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| 185 | <hr size="6">
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| 186 | <a name="SEC7"></a>
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| 187 | <table cellpadding="1" cellspacing="1" border="0">
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| 188 | <tr><td valign="middle" align="left">[<a href="#SEC6" title="Previous section in reading order"> < </a>]</td>
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| 189 | <td valign="middle" align="left">[<a href="#SEC8" title="Next section in reading order"> > </a>]</td>
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| 190 | <td valign="middle" align="left"> </td>
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| 191 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 192 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 193 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 195 | <td valign="middle" align="left"> </td>
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| 196 | <td valign="middle" align="left"> </td>
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| 197 | <td valign="middle" align="left"> </td>
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| 198 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 199 | <td valign="middle" align="left">[Contents]</td>
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| 200 | <td valign="middle" align="left">[Index]</td>
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| 201 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 202 | </tr></table>
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| 203 | <h2 class="section"> 1.6 Why does ffmpeg not decode audio in VOB files ? </h2>
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| 204 |
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| 205 | <p>The audio is AC3 (a.k.a. A/52). AC3 decoding is an optional component in ffmpeg
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| 206 | as the component that handles AC3 decoding (liba52) is currently released under
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| 207 | the GPL. If you have liba52 installed on your system, enable AC3 decoding
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| 208 | with <code>./configure --enable-a52</code>. Take care: by
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| 209 | enabling AC3, you automatically change the license of libavcodec from
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| 210 | LGPL to GPL.
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| 211 | </p>
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| 212 | <hr size="6">
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| 213 | <a name="SEC8"></a>
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| 214 | <table cellpadding="1" cellspacing="1" border="0">
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| 215 | <tr><td valign="middle" align="left">[<a href="#SEC7" title="Previous section in reading order"> < </a>]</td>
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| 216 | <td valign="middle" align="left">[<a href="#SEC9" title="Next section in reading order"> > </a>]</td>
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| 217 | <td valign="middle" align="left"> </td>
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| 218 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 219 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 220 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 222 | <td valign="middle" align="left"> </td>
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| 223 | <td valign="middle" align="left"> </td>
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| 224 | <td valign="middle" align="left"> </td>
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| 225 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 226 | <td valign="middle" align="left">[Contents]</td>
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| 227 | <td valign="middle" align="left">[Index]</td>
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| 228 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 229 | </tr></table>
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| 230 | <h2 class="section"> 1.7 Which codecs are supported by Windows ? </h2>
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| 231 |
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| 232 | <p>Windows does not support standard formats like MPEG very well, unless you
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| 233 | install some additional codecs
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| 234 | </p>
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| 235 | <p>The following list of video codecs should work on most Windows systems:
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| 236 | </p><dl compact="compact">
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| 237 | <dt> <samp>`msmpeg4v2'</samp></dt>
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| 238 | <dd><p>.avi/.asf
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| 239 | </p></dd>
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| 240 | <dt> <samp>`msmpeg4'</samp></dt>
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| 241 | <dd><p>.asf only
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| 242 | </p></dd>
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| 243 | <dt> <samp>`wmv1'</samp></dt>
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| 244 | <dd><p>.asf only
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| 245 | </p></dd>
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| 246 | <dt> <samp>`wmv2'</samp></dt>
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| 247 | <dd><p>.asf only
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| 248 | </p></dd>
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| 249 | <dt> <samp>`mpeg4'</samp></dt>
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| 250 | <dd><p>only if you have some MPEG-4 codec installed like ffdshow or XviD
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| 251 | </p></dd>
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| 252 | <dt> <samp>`mpeg1'</samp></dt>
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| 253 | <dd><p>.mpg only
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| 254 | </p></dd>
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| 255 | </dl>
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| 256 | <p>Note, ASF files often have .wmv or .wma extensions in Windows. It should also
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| 257 | be mentioned that Microsoft claims a patent on the ASF format, and may sue
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| 258 | or threaten users who create ASF files with non-Microsoft software. It is
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| 259 | strongly advised to avoid ASF where possible.
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| 260 | </p>
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| 261 | <p>The following list of audio codecs should work on most Windows systems:
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| 262 | </p><dl compact="compact">
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| 263 | <dt> <samp>`adpcm_ima_wav'</samp></dt>
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| 264 | <dt> <samp>`adpcm_ms'</samp></dt>
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| 265 | <dt> <samp>`pcm'</samp></dt>
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| 266 | <dt> <samp>`mp3'</samp></dt>
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| 267 | <dd><p>if some MP3 codec like LAME is installed
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| 268 | </p></dd>
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| 269 | </dl>
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| 270 |
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| 271 | <hr size="6">
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| 272 | <a name="SEC9"></a>
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| 273 | <table cellpadding="1" cellspacing="1" border="0">
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| 274 | <tr><td valign="middle" align="left">[<a href="#SEC8" title="Previous section in reading order"> < </a>]</td>
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| 277 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 283 | <td valign="middle" align="left"> </td>
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| 284 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 285 | <td valign="middle" align="left">[Contents]</td>
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| 286 | <td valign="middle" align="left">[Index]</td>
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| 287 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 288 | </tr></table>
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| 289 | <h2 class="section"> 1.8 Why does the chrominance data seem to be sampled at a different time from the luminance data on bt8x8 captures on Linux? </h2>
|
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| 290 |
|
|---|
| 291 | <p>This is a well-known bug in the bt8x8 driver. For 2.4.26 there is a patch at
|
|---|
| 292 | (<a href="http://mplayerhq.hu/~michael/bttv-420-2.4.26.patch">http://mplayerhq.hu/~michael/bttv-420-2.4.26.patch</a>). This may also
|
|---|
| 293 | apply cleanly to other 2.4-series kernels.
|
|---|
| 294 | </p>
|
|---|
| 295 | <hr size="6">
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| 296 | <a name="SEC10"></a>
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| 297 | <table cellpadding="1" cellspacing="1" border="0">
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| 298 | <tr><td valign="middle" align="left">[<a href="#SEC9" title="Previous section in reading order"> < </a>]</td>
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| 299 | <td valign="middle" align="left">[<a href="#SEC11" title="Next section in reading order"> > </a>]</td>
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| 300 | <td valign="middle" align="left"> </td>
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| 301 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 302 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 303 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 304 | <td valign="middle" align="left"> </td>
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| 305 | <td valign="middle" align="left"> </td>
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| 306 | <td valign="middle" align="left"> </td>
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| 307 | <td valign="middle" align="left"> </td>
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| 308 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
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| 309 | <td valign="middle" align="left">[Contents]</td>
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| 310 | <td valign="middle" align="left">[Index]</td>
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| 311 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
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| 312 | </tr></table>
|
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| 313 | <h2 class="section"> 1.9 How do I avoid the ugly aliasing artifacts in bt8x8 captures on Linux? </h2>
|
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| 314 |
|
|---|
| 315 | <p>Pass 'combfilter=1 lumafilter=1' to the bttv driver. Note though that 'combfilter=1'
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| 316 | will cause somewhat too strong filtering. A fix is to apply (<a href="http://mplayerhq.hu/~michael/bttv-comb-2.4.26.patch">http://mplayerhq.hu/~michael/bttv-comb-2.4.26.patch</a>)
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| 317 | or (<a href="http://mplayerhq.hu/~michael/bttv-comb-2.6.6.patch">http://mplayerhq.hu/~michael/bttv-comb-2.6.6.patch</a>)
|
|---|
| 318 | and pass 'combfilter=2'.
|
|---|
| 319 | </p>
|
|---|
| 320 | <hr size="6">
|
|---|
| 321 | <a name="SEC11"></a>
|
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| 322 | <table cellpadding="1" cellspacing="1" border="0">
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| 323 | <tr><td valign="middle" align="left">[<a href="#SEC10" title="Previous section in reading order"> < </a>]</td>
|
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| 324 | <td valign="middle" align="left">[<a href="#SEC12" title="Next section in reading order"> > </a>]</td>
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| 325 | <td valign="middle" align="left"> </td>
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| 326 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 327 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 328 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 329 | <td valign="middle" align="left"> </td>
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| 330 | <td valign="middle" align="left"> </td>
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| 331 | <td valign="middle" align="left"> </td>
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| 332 | <td valign="middle" align="left"> </td>
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| 333 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
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| 334 | <td valign="middle" align="left">[Contents]</td>
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| 335 | <td valign="middle" align="left">[Index]</td>
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| 336 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 337 | </tr></table>
|
|---|
| 338 | <h2 class="section"> 1.10 I have a problem with an old version of ffmpeg; where should I report it? </h2>
|
|---|
| 339 | <p>Nowhere. Upgrade to the latest release or if there is no recent release upgrade
|
|---|
| 340 | to Subversion HEAD. You could also try to report it. Maybe you will get lucky and
|
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| 341 | become the first person in history to get an answer different from "upgrade
|
|---|
| 342 | to Subversion HEAD".
|
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| 343 | </p>
|
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| 344 | <hr size="6">
|
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| 345 | <a name="SEC12"></a>
|
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| 346 | <table cellpadding="1" cellspacing="1" border="0">
|
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| 347 | <tr><td valign="middle" align="left">[<a href="#SEC11" title="Previous section in reading order"> < </a>]</td>
|
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| 348 | <td valign="middle" align="left">[<a href="#SEC13" title="Next section in reading order"> > </a>]</td>
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| 349 | <td valign="middle" align="left"> </td>
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| 350 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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| 351 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
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| 352 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
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| 353 | <td valign="middle" align="left"> </td>
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| 354 | <td valign="middle" align="left"> </td>
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| 355 | <td valign="middle" align="left"> </td>
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| 356 | <td valign="middle" align="left"> </td>
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| 357 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
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| 358 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 359 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 360 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 361 | </tr></table>
|
|---|
| 362 | <h2 class="section"> 1.11 -f jpeg doesn't work. </h2>
|
|---|
| 363 |
|
|---|
| 364 | <p>Try '-f image -img jpeg test%d.jpg'.
|
|---|
| 365 | </p>
|
|---|
| 366 | <hr size="6">
|
|---|
| 367 | <a name="SEC13"></a>
|
|---|
| 368 | <table cellpadding="1" cellspacing="1" border="0">
|
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| 369 | <tr><td valign="middle" align="left">[<a href="#SEC12" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 370 | <td valign="middle" align="left">[<a href="#SEC14" title="Next section in reading order"> > </a>]</td>
|
|---|
| 371 | <td valign="middle" align="left"> </td>
|
|---|
| 372 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 373 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
|
|---|
| 374 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
|
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| 375 | <td valign="middle" align="left"> </td>
|
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| 376 | <td valign="middle" align="left"> </td>
|
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| 377 | <td valign="middle" align="left"> </td>
|
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| 378 | <td valign="middle" align="left"> </td>
|
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| 379 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 380 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 381 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 382 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 383 | </tr></table>
|
|---|
| 384 | <h2 class="section"> 1.12 Why can I not change the framerate? </h2>
|
|---|
| 385 |
|
|---|
| 386 | <p>Some codecs, like MPEG-1/2, only allow a small number of fixed framerates.
|
|---|
| 387 | Choose a different codec with the -vcodec command line option.
|
|---|
| 388 | </p>
|
|---|
| 389 | <hr size="6">
|
|---|
| 390 | <a name="SEC14"></a>
|
|---|
| 391 | <table cellpadding="1" cellspacing="1" border="0">
|
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| 392 | <tr><td valign="middle" align="left">[<a href="#SEC13" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 393 | <td valign="middle" align="left">[<a href="#SEC15" title="Next section in reading order"> > </a>]</td>
|
|---|
| 394 | <td valign="middle" align="left"> </td>
|
|---|
| 395 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 396 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
|
|---|
| 397 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
|
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| 398 | <td valign="middle" align="left"> </td>
|
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| 399 | <td valign="middle" align="left"> </td>
|
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| 400 | <td valign="middle" align="left"> </td>
|
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| 401 | <td valign="middle" align="left"> </td>
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| 402 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 403 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 404 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 405 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 406 | </tr></table>
|
|---|
| 407 | <h2 class="section"> 1.13 ffmpeg does not work; What is wrong? </h2>
|
|---|
| 408 |
|
|---|
| 409 | <p>Try a 'make distclean' in the ffmpeg source directory. If this does not help see
|
|---|
| 410 | (<a href="http://ffmpeg.org/bugreports.php">http://ffmpeg.org/bugreports.php</a>).
|
|---|
| 411 | </p>
|
|---|
| 412 | <hr size="6">
|
|---|
| 413 | <a name="SEC15"></a>
|
|---|
| 414 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 415 | <tr><td valign="middle" align="left">[<a href="#SEC14" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 416 | <td valign="middle" align="left">[<a href="#SEC16" title="Next section in reading order"> > </a>]</td>
|
|---|
| 417 | <td valign="middle" align="left"> </td>
|
|---|
| 418 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 419 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
|
|---|
| 420 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
|
|---|
| 421 | <td valign="middle" align="left"> </td>
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| 422 | <td valign="middle" align="left"> </td>
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| 423 | <td valign="middle" align="left"> </td>
|
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| 424 | <td valign="middle" align="left"> </td>
|
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| 425 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 426 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 427 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 428 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 429 | </tr></table>
|
|---|
| 430 | <h2 class="section"> 1.14 How do I encode XviD or DivX video with ffmpeg? </h2>
|
|---|
| 431 |
|
|---|
| 432 | <p>Both XviD and DivX (version 4+) are implementations of the ISO MPEG-4
|
|---|
| 433 | standard (note that there are many other coding formats that use this
|
|---|
| 434 | same standard). Thus, use '-vcodec mpeg4' to encode these formats. The
|
|---|
| 435 | default fourcc stored in an MPEG-4-coded file will be 'FMP4'. If you want
|
|---|
| 436 | a different fourcc, use the '-vtag' option. E.g., '-vtag xvid' will
|
|---|
| 437 | force the fourcc 'xvid' to be stored as the video fourcc rather than the
|
|---|
| 438 | default.
|
|---|
| 439 | </p>
|
|---|
| 440 | <hr size="6">
|
|---|
| 441 | <a name="SEC16"></a>
|
|---|
| 442 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 443 | <tr><td valign="middle" align="left">[<a href="#SEC15" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 444 | <td valign="middle" align="left">[<a href="#SEC17" title="Next section in reading order"> > </a>]</td>
|
|---|
| 445 | <td valign="middle" align="left"> </td>
|
|---|
| 446 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 447 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
|
|---|
| 448 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
|
|---|
| 449 | <td valign="middle" align="left"> </td>
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| 450 | <td valign="middle" align="left"> </td>
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| 451 | <td valign="middle" align="left"> </td>
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| 452 | <td valign="middle" align="left"> </td>
|
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| 453 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 454 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 455 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 456 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 457 | </tr></table>
|
|---|
| 458 | <h2 class="section"> 1.15 How do I encode videos which play on the iPod? </h2>
|
|---|
| 459 |
|
|---|
| 460 | <dl compact="compact">
|
|---|
| 461 | <dt> <samp>`needed stuff'</samp></dt>
|
|---|
| 462 | <dd><p>-acodec aac -vcodec mpeg4 width<=320 height<=240
|
|---|
| 463 | </p></dd>
|
|---|
| 464 | <dt> <samp>`working stuff'</samp></dt>
|
|---|
| 465 | <dd><p>4mv, title
|
|---|
| 466 | </p></dd>
|
|---|
| 467 | <dt> <samp>`non-working stuff'</samp></dt>
|
|---|
| 468 | <dd><p>B-frames
|
|---|
| 469 | </p></dd>
|
|---|
| 470 | <dt> <samp>`example command line'</samp></dt>
|
|---|
| 471 | <dd><p>ffmpeg -i input -acodec aac -ab 128 -vcodec mpeg4 -b 1200 -mbd 2 -flags +4mv+trell -aic 2 -cmp 2 -subcmp 2 -s 320x180 -title X output.mp4
|
|---|
| 472 | </p></dd>
|
|---|
| 473 | </dl>
|
|---|
| 474 |
|
|---|
| 475 | <hr size="6">
|
|---|
| 476 | <a name="SEC17"></a>
|
|---|
| 477 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 478 | <tr><td valign="middle" align="left">[<a href="#SEC16" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 479 | <td valign="middle" align="left">[<a href="#SEC18" title="Next section in reading order"> > </a>]</td>
|
|---|
| 480 | <td valign="middle" align="left"> </td>
|
|---|
| 481 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 482 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
|
|---|
| 483 | <td valign="middle" align="left">[<a href="#SEC18" title="Next chapter"> >> </a>]</td>
|
|---|
| 484 | <td valign="middle" align="left"> </td>
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| 485 | <td valign="middle" align="left"> </td>
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| 486 | <td valign="middle" align="left"> </td>
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| 487 | <td valign="middle" align="left"> </td>
|
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| 488 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 489 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 490 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 491 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 492 | </tr></table>
|
|---|
| 493 | <h2 class="section"> 1.16 How do I encode videos which play on the PSP? </h2>
|
|---|
| 494 |
|
|---|
| 495 | <dl compact="compact">
|
|---|
| 496 | <dt> <samp>`needed stuff'</samp></dt>
|
|---|
| 497 | <dd><p>-acodec aac -vcodec mpeg4 width*height<=76800 width%16=0 height%16=0 -ar 24000 -r 30000/1001 or 15000/1001 -f psp
|
|---|
| 498 | </p></dd>
|
|---|
| 499 | <dt> <samp>`working stuff'</samp></dt>
|
|---|
| 500 | <dd><p>4mv, title
|
|---|
| 501 | </p></dd>
|
|---|
| 502 | <dt> <samp>`non-working stuff'</samp></dt>
|
|---|
| 503 | <dd><p>B-frames
|
|---|
| 504 | </p></dd>
|
|---|
| 505 | <dt> <samp>`example command line'</samp></dt>
|
|---|
| 506 | <dd><p>ffmpeg -i input -acodec aac -ab 128 -vcodec mpeg4 -b 1200 -ar 24000 -mbd 2 -flags +4mv+trell -aic 2 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -title X -f psp output.mp4
|
|---|
| 507 | </p></dd>
|
|---|
| 508 | <dt> <samp>`needed stuff for H.264'</samp></dt>
|
|---|
| 509 | <dd><p>-acodec aac -vcodec h264 width*height<=76800 width%16=0? height%16=0? -ar 48000 -coder 1 -r 30000/1001 or 15000/1001 -f psp
|
|---|
| 510 | </p></dd>
|
|---|
| 511 | <dt> <samp>`working stuff for H.264'</samp></dt>
|
|---|
| 512 | <dd><p>title, loop filter
|
|---|
| 513 | </p></dd>
|
|---|
| 514 | <dt> <samp>`non-working stuff for H.264'</samp></dt>
|
|---|
| 515 | <dd><p>CAVLC
|
|---|
| 516 | </p></dd>
|
|---|
| 517 | <dt> <samp>`example command line'</samp></dt>
|
|---|
| 518 | <dd><p>ffmpeg -i input -acodec aac -ab 128 -vcodec h264 -b 1200 -ar 48000 -mbd 2 -coder 1 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -title X -f psp -flags loop -trellis 2 -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 output.mp4
|
|---|
| 519 | </p></dd>
|
|---|
| 520 | </dl>
|
|---|
| 521 |
|
|---|
| 522 | <hr size="6">
|
|---|
| 523 | <a name="SEC18"></a>
|
|---|
| 524 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 525 | <tr><td valign="middle" align="left">[<a href="#SEC17" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 526 | <td valign="middle" align="left">[<a href="#SEC19" title="Next section in reading order"> > </a>]</td>
|
|---|
| 527 | <td valign="middle" align="left"> </td>
|
|---|
| 528 | <td valign="middle" align="left">[<a href="#SEC1" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 529 | <td valign="middle" align="left">[<a href="#SEC1" title="Up section"> Up </a>]</td>
|
|---|
| 530 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 531 | <td valign="middle" align="left"> </td>
|
|---|
| 532 | <td valign="middle" align="left"> </td>
|
|---|
| 533 | <td valign="middle" align="left"> </td>
|
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| 534 | <td valign="middle" align="left"> </td>
|
|---|
| 535 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 536 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 537 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 538 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 539 | </tr></table>
|
|---|
| 540 | <h1 class="chapter"> 2. Development </h1>
|
|---|
| 541 |
|
|---|
| 542 | <hr size="6">
|
|---|
| 543 | <a name="SEC19"></a>
|
|---|
| 544 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 545 | <tr><td valign="middle" align="left">[<a href="#SEC18" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 546 | <td valign="middle" align="left">[<a href="#SEC20" title="Next section in reading order"> > </a>]</td>
|
|---|
| 547 | <td valign="middle" align="left"> </td>
|
|---|
| 548 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 549 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 550 | <td valign="middle" align="left">[ >> ]</td>
|
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| 551 | <td valign="middle" align="left"> </td>
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| 552 | <td valign="middle" align="left"> </td>
|
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| 553 | <td valign="middle" align="left"> </td>
|
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| 554 | <td valign="middle" align="left"> </td>
|
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| 555 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 556 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 557 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 558 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 559 | </tr></table>
|
|---|
| 560 | <h2 class="section"> 2.1 When will the next FFmpeg version be released? / Why are FFmpeg releases so few and far between? </h2>
|
|---|
| 561 |
|
|---|
| 562 | <p>Like most open source projects FFmpeg suffers from a certain lack of
|
|---|
| 563 | manpower. For this reason the developers have to prioritize the work
|
|---|
| 564 | they do and putting out releases is not at the top of the list, fixing
|
|---|
| 565 | bugs and reviewing patches takes precedence. Please don't complain or
|
|---|
| 566 | request more timely and/or frequent releases unless you are willing to
|
|---|
| 567 | help out creating them.
|
|---|
| 568 | </p>
|
|---|
| 569 | <hr size="6">
|
|---|
| 570 | <a name="SEC20"></a>
|
|---|
| 571 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 572 | <tr><td valign="middle" align="left">[<a href="#SEC19" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 573 | <td valign="middle" align="left">[<a href="#SEC21" title="Next section in reading order"> > </a>]</td>
|
|---|
| 574 | <td valign="middle" align="left"> </td>
|
|---|
| 575 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 576 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 577 | <td valign="middle" align="left">[ >> ]</td>
|
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| 578 | <td valign="middle" align="left"> </td>
|
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| 579 | <td valign="middle" align="left"> </td>
|
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| 580 | <td valign="middle" align="left"> </td>
|
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| 581 | <td valign="middle" align="left"> </td>
|
|---|
| 582 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 583 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 584 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 585 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 586 | </tr></table>
|
|---|
| 587 | <h2 class="section"> 2.2 Why doesn't FFmpeg support feature [xyz]? </h2>
|
|---|
| 588 |
|
|---|
| 589 | <p>Because no one has taken on that task yet. FFmpeg development is
|
|---|
| 590 | driven by the tasks that are important to the individual developers.
|
|---|
| 591 | If there is a feature that is important to you, the best way to get
|
|---|
| 592 | it implemented is to undertake the task yourself.
|
|---|
| 593 | </p>
|
|---|
| 594 |
|
|---|
| 595 | <hr size="6">
|
|---|
| 596 | <a name="SEC21"></a>
|
|---|
| 597 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 598 | <tr><td valign="middle" align="left">[<a href="#SEC20" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 599 | <td valign="middle" align="left">[<a href="#SEC22" title="Next section in reading order"> > </a>]</td>
|
|---|
| 600 | <td valign="middle" align="left"> </td>
|
|---|
| 601 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 602 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 603 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 604 | <td valign="middle" align="left"> </td>
|
|---|
| 605 | <td valign="middle" align="left"> </td>
|
|---|
| 606 | <td valign="middle" align="left"> </td>
|
|---|
| 607 | <td valign="middle" align="left"> </td>
|
|---|
| 608 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 609 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 610 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 611 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 612 | </tr></table>
|
|---|
| 613 | <h2 class="section"> 2.3 Are there examples illustrating how to use the FFmpeg libraries, particularly libavcodec and libavformat ? </h2>
|
|---|
| 614 |
|
|---|
| 615 | <p>Yes. Read the Developers Guide of the FFmpeg documentation. Alternatively,
|
|---|
| 616 | examine the source code for one of the many open source projects that
|
|---|
| 617 | already incorporate ffmpeg at (<a href="projects.php">projects.php</a>).
|
|---|
| 618 | </p>
|
|---|
| 619 | <hr size="6">
|
|---|
| 620 | <a name="SEC22"></a>
|
|---|
| 621 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 622 | <tr><td valign="middle" align="left">[<a href="#SEC21" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 623 | <td valign="middle" align="left">[<a href="#SEC23" title="Next section in reading order"> > </a>]</td>
|
|---|
| 624 | <td valign="middle" align="left"> </td>
|
|---|
| 625 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 626 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 627 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 628 | <td valign="middle" align="left"> </td>
|
|---|
| 629 | <td valign="middle" align="left"> </td>
|
|---|
| 630 | <td valign="middle" align="left"> </td>
|
|---|
| 631 | <td valign="middle" align="left"> </td>
|
|---|
| 632 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 633 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 634 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 635 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 636 | </tr></table>
|
|---|
| 637 | <h2 class="section"> 2.4 Can you support my C compiler XXX ? </h2>
|
|---|
| 638 |
|
|---|
| 639 | <p>No. Only GCC is supported. GCC is ported to most systems available and there
|
|---|
| 640 | is no need to pollute the source code with <code>#ifdef</code>s
|
|---|
| 641 | related to the compiler.
|
|---|
| 642 | </p>
|
|---|
| 643 | <hr size="6">
|
|---|
| 644 | <a name="SEC23"></a>
|
|---|
| 645 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 646 | <tr><td valign="middle" align="left">[<a href="#SEC22" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 647 | <td valign="middle" align="left">[<a href="#SEC24" title="Next section in reading order"> > </a>]</td>
|
|---|
| 648 | <td valign="middle" align="left"> </td>
|
|---|
| 649 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 650 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 651 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 652 | <td valign="middle" align="left"> </td>
|
|---|
| 653 | <td valign="middle" align="left"> </td>
|
|---|
| 654 | <td valign="middle" align="left"> </td>
|
|---|
| 655 | <td valign="middle" align="left"> </td>
|
|---|
| 656 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 657 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 658 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 659 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 660 | </tr></table>
|
|---|
| 661 | <h2 class="section"> 2.5 Can I use FFmpeg or libavcodec under Windows ? </h2>
|
|---|
| 662 |
|
|---|
| 663 | <p>Yes, but the MinGW tools <em>must</em> be used to compile FFmpeg. You
|
|---|
| 664 | can link the resulting DLLs with any other Windows program. Read the
|
|---|
| 665 | <em>Native Windows Compilation</em> and <em>Visual C++ compatibility</em>
|
|---|
| 666 | sections in the FFmpeg documentation to find more information.
|
|---|
| 667 | </p>
|
|---|
| 668 | <hr size="6">
|
|---|
| 669 | <a name="SEC24"></a>
|
|---|
| 670 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 671 | <tr><td valign="middle" align="left">[<a href="#SEC23" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 672 | <td valign="middle" align="left">[<a href="#SEC25" title="Next section in reading order"> > </a>]</td>
|
|---|
| 673 | <td valign="middle" align="left"> </td>
|
|---|
| 674 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 675 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 676 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 677 | <td valign="middle" align="left"> </td>
|
|---|
| 678 | <td valign="middle" align="left"> </td>
|
|---|
| 679 | <td valign="middle" align="left"> </td>
|
|---|
| 680 | <td valign="middle" align="left"> </td>
|
|---|
| 681 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 682 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 683 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 684 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 685 | </tr></table>
|
|---|
| 686 | <h2 class="section"> 2.6 Can you add automake, libtool or autoconf support ? </h2>
|
|---|
| 687 |
|
|---|
| 688 | <p>No. These tools are too bloated and they complicate the build. Moreover,
|
|---|
| 689 | since only <samp>`gcc'</samp> is supported they would add little advantages in
|
|---|
| 690 | terms of portability.
|
|---|
| 691 | </p>
|
|---|
| 692 | <hr size="6">
|
|---|
| 693 | <a name="SEC25"></a>
|
|---|
| 694 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 695 | <tr><td valign="middle" align="left">[<a href="#SEC24" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 696 | <td valign="middle" align="left">[<a href="#SEC26" title="Next section in reading order"> > </a>]</td>
|
|---|
| 697 | <td valign="middle" align="left"> </td>
|
|---|
| 698 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 699 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 700 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 701 | <td valign="middle" align="left"> </td>
|
|---|
| 702 | <td valign="middle" align="left"> </td>
|
|---|
| 703 | <td valign="middle" align="left"> </td>
|
|---|
| 704 | <td valign="middle" align="left"> </td>
|
|---|
| 705 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 706 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 707 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 708 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 709 | </tr></table>
|
|---|
| 710 | <h2 class="section"> 2.7 Why not rewrite ffmpeg in object-oriented C++ ? </h2>
|
|---|
| 711 |
|
|---|
| 712 | <p>ffmpeg is already organized in a highly modular manner and does not need to
|
|---|
| 713 | be rewritten in a formal object language. Further, many of the developers
|
|---|
| 714 | favor straight C; it works for them. For more arguments on this matter,
|
|---|
| 715 | read "Programming Religion" at (<a href="http://lkml.org/faq/lkmlfaq-15.html">http://lkml.org/faq/lkmlfaq-15.html</a>).
|
|---|
| 716 | </p>
|
|---|
| 717 | <hr size="6">
|
|---|
| 718 | <a name="SEC26"></a>
|
|---|
| 719 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 720 | <tr><td valign="middle" align="left">[<a href="#SEC25" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 721 | <td valign="middle" align="left">[<a href="#SEC27" title="Next section in reading order"> > </a>]</td>
|
|---|
| 722 | <td valign="middle" align="left"> </td>
|
|---|
| 723 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 724 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 725 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 726 | <td valign="middle" align="left"> </td>
|
|---|
| 727 | <td valign="middle" align="left"> </td>
|
|---|
| 728 | <td valign="middle" align="left"> </td>
|
|---|
| 729 | <td valign="middle" align="left"> </td>
|
|---|
| 730 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 731 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 732 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 733 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 734 | </tr></table>
|
|---|
| 735 | <h2 class="section"> 2.8 Why are the ffmpeg programs devoid of debugging symbols ? </h2>
|
|---|
| 736 |
|
|---|
| 737 | <p>The build process creates ffmpeg_g, ffplay_g, etc. which contain full debug
|
|---|
| 738 | information. Those binaries are strip'd to create ffmpeg, ffplay, etc. If
|
|---|
| 739 | you need the debug information, used the *_g versions.
|
|---|
| 740 | </p>
|
|---|
| 741 | <hr size="6">
|
|---|
| 742 | <a name="SEC27"></a>
|
|---|
| 743 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 744 | <tr><td valign="middle" align="left">[<a href="#SEC26" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 745 | <td valign="middle" align="left">[<a href="#SEC28" title="Next section in reading order"> > </a>]</td>
|
|---|
| 746 | <td valign="middle" align="left"> </td>
|
|---|
| 747 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 748 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 749 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 750 | <td valign="middle" align="left"> </td>
|
|---|
| 751 | <td valign="middle" align="left"> </td>
|
|---|
| 752 | <td valign="middle" align="left"> </td>
|
|---|
| 753 | <td valign="middle" align="left"> </td>
|
|---|
| 754 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 755 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 756 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 757 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 758 | </tr></table>
|
|---|
| 759 | <h2 class="section"> 2.9 I do not like the LGPL, can I contribute code under the GPL instead ? </h2>
|
|---|
| 760 |
|
|---|
| 761 | <p>Yes, as long as the code is optional and can easily and cleanly be placed
|
|---|
| 762 | under #ifdef CONFIG_GPL without breaking anything. So for example a new codec
|
|---|
| 763 | or filter would be OK under GPL while a bugfix to LGPL code would not.
|
|---|
| 764 | </p>
|
|---|
| 765 | <hr size="6">
|
|---|
| 766 | <a name="SEC28"></a>
|
|---|
| 767 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 768 | <tr><td valign="middle" align="left">[<a href="#SEC27" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 769 | <td valign="middle" align="left">[<a href="#SEC29" title="Next section in reading order"> > </a>]</td>
|
|---|
| 770 | <td valign="middle" align="left"> </td>
|
|---|
| 771 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 772 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 773 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 774 | <td valign="middle" align="left"> </td>
|
|---|
| 775 | <td valign="middle" align="left"> </td>
|
|---|
| 776 | <td valign="middle" align="left"> </td>
|
|---|
| 777 | <td valign="middle" align="left"> </td>
|
|---|
| 778 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 779 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 780 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 781 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 782 | </tr></table>
|
|---|
| 783 | <h2 class="section"> 2.10 I want to compile xyz.c alone but my compiler produced many errors. </h2>
|
|---|
| 784 |
|
|---|
| 785 | <p>Common code is in its own files in libav* and is used by the individual
|
|---|
| 786 | codecs. They will not work without the common parts, you have to compile
|
|---|
| 787 | the whole libav*. If you wish, disable some parts with configure switches.
|
|---|
| 788 | You can also try to hack it and remove more, but if you had problems fixing
|
|---|
| 789 | the compilation failure then you are probably not qualified for this.
|
|---|
| 790 | </p>
|
|---|
| 791 | <hr size="6">
|
|---|
| 792 | <a name="SEC29"></a>
|
|---|
| 793 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 794 | <tr><td valign="middle" align="left">[<a href="#SEC28" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 795 | <td valign="middle" align="left">[<a href="#SEC30" title="Next section in reading order"> > </a>]</td>
|
|---|
| 796 | <td valign="middle" align="left"> </td>
|
|---|
| 797 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 798 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 799 | <td valign="middle" align="left">[ >> ]</td>
|
|---|
| 800 | <td valign="middle" align="left"> </td>
|
|---|
| 801 | <td valign="middle" align="left"> </td>
|
|---|
| 802 | <td valign="middle" align="left"> </td>
|
|---|
| 803 | <td valign="middle" align="left"> </td>
|
|---|
| 804 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 805 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 806 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 807 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 808 | </tr></table>
|
|---|
| 809 | <h2 class="section"> 2.11 Visual C++ produces many errors. </h2>
|
|---|
| 810 |
|
|---|
| 811 | <p>Visual C++ is not compliant to the C standard and does not support
|
|---|
| 812 | the inline assembly used in FFmpeg.
|
|---|
| 813 | If you wish - for whatever weird reason - to use Visual C++ for your
|
|---|
| 814 | project then you can link the Visual C++ code with libav* as long as
|
|---|
| 815 | you compile the latter with a working C compiler. For more information, see
|
|---|
| 816 | the <em>Visual C++ compatibility</em> section in the FFmpeg documentation.
|
|---|
| 817 | </p>
|
|---|
| 818 | <p>There have been efforts to make FFmpeg compatible with Visual C++ in the
|
|---|
| 819 | past. However, they have all been rejected as too intrusive, especially
|
|---|
| 820 | since MinGW does the job perfectly adequately. None of the core developers
|
|---|
| 821 | work with Visual C++ and thus this item is low priority. Should you find
|
|---|
| 822 | the silver bullet that solves this problem, feel free to shoot it at us.
|
|---|
| 823 | </p>
|
|---|
| 824 | <hr size="6">
|
|---|
| 825 | <a name="SEC30"></a>
|
|---|
| 826 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 827 | <tr><td valign="middle" align="left">[<a href="#SEC29" title="Previous section in reading order"> < </a>]</td>
|
|---|
| 828 | <td valign="middle" align="left">[ > ]</td>
|
|---|
| 829 | <td valign="middle" align="left"> </td>
|
|---|
| 830 | <td valign="middle" align="left">[<a href="#SEC18" title="Beginning of this chapter or previous chapter"> << </a>]</td>
|
|---|
| 831 | <td valign="middle" align="left">[<a href="#SEC18" title="Up section"> Up </a>]</td>
|
|---|
| 832 | <td valign="middle" align="left">[ >> ]</td>
|
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| 833 | <td valign="middle" align="left"> </td>
|
|---|
| 834 | <td valign="middle" align="left"> </td>
|
|---|
| 835 | <td valign="middle" align="left"> </td>
|
|---|
| 836 | <td valign="middle" align="left"> </td>
|
|---|
| 837 | <td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 838 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 839 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 840 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 841 | </tr></table>
|
|---|
| 842 | <h2 class="section"> 2.12 I have a file in memory / a API different from *open/*read/ libc how do i use it with libavformat ? </h2>
|
|---|
| 843 |
|
|---|
| 844 | <p>You have to implement a URLProtocol, see libavformat/file.c in FFmpeg
|
|---|
| 845 | and libmpdemux/demux_lavf.c in MPlayer sources.
|
|---|
| 846 | </p>
|
|---|
| 847 | <hr size="6">
|
|---|
| 848 | <a name="SEC_About"></a>
|
|---|
| 849 | <table cellpadding="1" cellspacing="1" border="0">
|
|---|
| 850 | <tr><td valign="middle" align="left">[<a href="#SEC1" title="Cover (top) of document">Top</a>]</td>
|
|---|
| 851 | <td valign="middle" align="left">[Contents]</td>
|
|---|
| 852 | <td valign="middle" align="left">[Index]</td>
|
|---|
| 853 | <td valign="middle" align="left">[<a href="#SEC_About" title="About (help)"> ? </a>]</td>
|
|---|
| 854 | </tr></table>
|
|---|
| 855 | <h1>About This Document</h1>
|
|---|
| 856 | <p>
|
|---|
| 857 | This document was generated on <i>June, 30 2006</i> using <a href="http://texi2html.cvshome.org/"><i>texi2html 1.76</i></a>.
|
|---|
| 858 | </p>
|
|---|
| 859 | <p>
|
|---|
| 860 | The buttons in the navigation panels have the following meaning:
|
|---|
| 861 | </p>
|
|---|
| 862 | <table border="1">
|
|---|
| 863 | <tr>
|
|---|
| 864 | <th> Button </th>
|
|---|
| 865 | <th> Name </th>
|
|---|
| 866 | <th> Go to </th>
|
|---|
| 867 | <th> From 1.2.3 go to</th>
|
|---|
| 868 | </tr>
|
|---|
| 869 | <tr>
|
|---|
| 870 | <td align="center"> [ < ] </td>
|
|---|
| 871 | <td align="center">Back</td>
|
|---|
| 872 | <td>previous section in reading order</td>
|
|---|
| 873 | <td>1.2.2</td>
|
|---|
| 874 | </tr>
|
|---|
| 875 | <tr>
|
|---|
| 876 | <td align="center"> [ > ] </td>
|
|---|
| 877 | <td align="center">Forward</td>
|
|---|
| 878 | <td>next section in reading order</td>
|
|---|
| 879 | <td>1.2.4</td>
|
|---|
| 880 | </tr>
|
|---|
| 881 | <tr>
|
|---|
| 882 | <td align="center"> [ << ] </td>
|
|---|
| 883 | <td align="center">FastBack</td>
|
|---|
| 884 | <td>beginning of this chapter or previous chapter</td>
|
|---|
| 885 | <td>1</td>
|
|---|
| 886 | </tr>
|
|---|
| 887 | <tr>
|
|---|
| 888 | <td align="center"> [ Up ] </td>
|
|---|
| 889 | <td align="center">Up</td>
|
|---|
| 890 | <td>up section</td>
|
|---|
| 891 | <td>1.2</td>
|
|---|
| 892 | </tr>
|
|---|
| 893 | <tr>
|
|---|
| 894 | <td align="center"> [ >> ] </td>
|
|---|
| 895 | <td align="center">FastForward</td>
|
|---|
| 896 | <td>next chapter</td>
|
|---|
| 897 | <td>2</td>
|
|---|
| 898 | </tr>
|
|---|
| 899 | <tr>
|
|---|
| 900 | <td align="center"> [Top] </td>
|
|---|
| 901 | <td align="center">Top</td>
|
|---|
| 902 | <td>cover (top) of document</td>
|
|---|
| 903 | <td> </td>
|
|---|
| 904 | </tr>
|
|---|
| 905 | <tr>
|
|---|
| 906 | <td align="center"> [Contents] </td>
|
|---|
| 907 | <td align="center">Contents</td>
|
|---|
| 908 | <td>table of contents</td>
|
|---|
| 909 | <td> </td>
|
|---|
| 910 | </tr>
|
|---|
| 911 | <tr>
|
|---|
| 912 | <td align="center"> [Index] </td>
|
|---|
| 913 | <td align="center">Index</td>
|
|---|
| 914 | <td>index</td>
|
|---|
| 915 | <td> </td>
|
|---|
| 916 | </tr>
|
|---|
| 917 | <tr>
|
|---|
| 918 | <td align="center"> [ ? ] </td>
|
|---|
| 919 | <td align="center">About</td>
|
|---|
| 920 | <td>about (help)</td>
|
|---|
| 921 | <td> </td>
|
|---|
| 922 | </tr>
|
|---|
| 923 | </table>
|
|---|
| 924 |
|
|---|
| 925 | <p>
|
|---|
| 926 | where the <strong> Example </strong> assumes that the current position is at <strong> Subsubsection One-Two-Three </strong> of a document of the following structure:
|
|---|
| 927 | </p>
|
|---|
| 928 |
|
|---|
| 929 | <ul>
|
|---|
| 930 | <li> 1. Section One
|
|---|
| 931 | <ul>
|
|---|
| 932 | <li>1.1 Subsection One-One
|
|---|
| 933 | <ul>
|
|---|
| 934 | <li>...</li>
|
|---|
| 935 | </ul>
|
|---|
| 936 | </li>
|
|---|
| 937 | <li>1.2 Subsection One-Two
|
|---|
| 938 | <ul>
|
|---|
| 939 | <li>1.2.1 Subsubsection One-Two-One</li>
|
|---|
| 940 | <li>1.2.2 Subsubsection One-Two-Two</li>
|
|---|
| 941 | <li>1.2.3 Subsubsection One-Two-Three
|
|---|
| 942 | <strong><== Current Position </strong></li>
|
|---|
| 943 | <li>1.2.4 Subsubsection One-Two-Four</li>
|
|---|
| 944 | </ul>
|
|---|
| 945 | </li>
|
|---|
| 946 | <li>1.3 Subsection One-Three
|
|---|
| 947 | <ul>
|
|---|
| 948 | <li>...</li>
|
|---|
| 949 | </ul>
|
|---|
| 950 | </li>
|
|---|
| 951 | <li>1.4 Subsection One-Four</li>
|
|---|
| 952 | </ul>
|
|---|
| 953 | </li>
|
|---|
| 954 | </ul>
|
|---|
| 955 |
|
|---|
| 956 | <hr size="1">
|
|---|
| 957 | <p>
|
|---|
| 958 | <font size="-1">
|
|---|
| 959 | This document was generated on <i>June, 30 2006</i> using <a href="http://texi2html.cvshome.org/"><i>texi2html 1.76</i></a>.
|
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| 960 | </font>
|
|---|
| 961 | <br>
|
|---|
| 962 |
|
|---|
| 963 | </p>
|
|---|
| 964 | </body>
|
|---|
| 965 | </html>
|
|---|
