Thanks for your reply. But is the detection work done by qemu/kvm or by spice server? <div class="gmail_quote">On Fri, Aug 3, 2012 at 3:21 PM, David Jaša <<a href="mailto:djasa@redhat.com" target="_blank">djasa@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, 徐浩 píše v Pá 03. 08. 2012 v 09:21 +0800: <div class="im">> Hi guys, > How does the video stream is detected, </div>by frequent updates to some area of the stream. <div class="im"> > and compression method change dynamicly? </div>IIRC, once video stream is detected, it's encoded as mjpeg. When the frequent updates cease, the area is retransmitted with lossless compression to avoid having visible artifacts. David > Best reguards! > _______________________________________________ > Spice-devel mailing list > <a href="mailto:Spice-devel@lists.freedesktop.org">Spice-devel@lists.freedesktop.org</a> > <a href="http://lists.freedesktop.org/mailman/listinfo/spice-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/spice-devel</a> -- David Jaša, RHCE SPICE QE based in Brno GPG Key: 22C33E24 Fingerprint: 513A 060B D1B4 2A72 7F0D 0278 B125 CD00 22C3 3E24 </blockquote></div>