| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="vrde-videochannel">
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| 4 | <title>VRDP Video Redirection</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>The VRDP server can redirect video streams from the guest to the RDP client. Video frames are compressed using
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| 8 | the JPEG algorithm allowing a higher compression ratio than standard RDP bitmap compression methods. It is
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| 9 | possible to increase the compression ratio by lowering the video quality. </p>
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| 10 | <p>The VRDP server automatically detects video streams in a guest as frequently updated rectangular areas. As a
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| 11 | result, this method works with any guest operating system without having to install additional software in the
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| 12 | guest. In particular, the Guest Additions are not required. </p>
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| 13 | <p>On the client side, however, currently only the Windows 7 Remote Desktop Connection client supports this feature.
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| 14 | If a client does not support video redirection, the VRDP server falls back to regular bitmap updates. </p>
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| 15 | <p>The following command enables video redirection: </p>
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| 16 | <pre xml:space="preserve">VBoxManage modifyvm <varname>VM-name</varname> --vrde-video-channel on</pre>
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| 17 | <p>The quality of the video is defined as a value from 10 to 100 percent, representing a JPEG compression level,
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| 18 | where lower numbers mean lower quality but higher compression. The quality can be changed using the following
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| 19 | command: </p>
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| 20 | <pre xml:space="preserve">VBoxManage modifyvm <varname>VM-name</varname> --vrde-video-channel-quality 75</pre>
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| 21 | </body>
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| 22 |
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| 23 | </topic>
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