| 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>
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| 8 | The VRDP server can redirect video streams from the guest to the
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| 9 | RDP client. Video frames are compressed using the JPEG algorithm
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| 10 | allowing a higher compression ratio than standard RDP bitmap
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| 11 | compression methods. It is possible to increase the compression
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| 12 | ratio by lowering the video quality.
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| 13 | </p>
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| 14 | <p>
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| 15 | The VRDP server automatically detects video streams in a guest
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| 16 | as frequently updated rectangular areas. As a result, this
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| 17 | method works with any guest operating system without having to
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| 18 | install additional software in the guest. In particular, the
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| 19 | Guest Additions are not required.
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| 20 | </p>
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| 21 | <p>
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| 22 | On the client side, however, currently only the Windows 7 Remote
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| 23 | Desktop Connection client supports this feature. If a client
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| 24 | does not support video redirection, the VRDP server falls back
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| 25 | to regular bitmap updates.
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| 26 | </p>
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| 27 | <p>
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| 28 | The following command enables video redirection:
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| 29 | </p>
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| 30 | <pre xml:space="preserve">VBoxManage modifyvm <varname>VM-name</varname> --vrde-video-channel on</pre>
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| 31 | <p>
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| 32 | The quality of the video is defined as a value from 10 to 100
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| 33 | percent, representing a JPEG compression level, where lower
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| 34 | numbers mean lower quality but higher compression. The quality
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| 35 | can be changed using the following command:
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| 36 | </p>
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| 37 | <pre xml:space="preserve">VBoxManage modifyvm <varname>VM-name</varname> --vrde-video-channel-quality 75</pre>
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| 38 | </body>
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| 39 |
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| 40 | </topic>
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