[Spice-devel] [PATCH 1/2] server: Don't send stream frames that are identical to the last one

[Yonit Halperin]

On 08/25/2010 11:49 AM, alexl at redhat.com wrote:
> From: Alexander Larsson<alexl at redhat.com>
>
> This happens e.g. with the vlc player when paused, as it still draws
> a continuous stream of frames (bug #28817). It may also help slightly
> if a video contains identical frames in a row for other reasons.
>
> We detect frame equality using the adler32 checksum. There is a small
> chance of checksum collisions, but that will just cause one frame to
> be skipped, or if it is the last frame it will be fixed when the stream
> ends and we get the lossless data for the region.
> ---

Ack, but I'm not sure we should add efficiency overhead for all streams 
(audio and video wise) if only VLC behaves in such manner.
Maybe we can add it only for low bandwidth,  and/or preform sampling of 
every X frames, and then if they are equal check if all the frames are 
equal.