[FFmpeg-devel] [PATCH] encoder for adobe's flash ScreenVideo2 codec

Mike Melanson mike
Tue Jul 21 17:01:34 CEST 2009

Joshua Warner wrote:
> Hi all,
> I've developed an encoder for Adobe's Flash ScreenVideo2 format, which is
> stored in flv files.  My encoder currently only supports a large subset of
> the format.  The only player that supports this codec (so far) is Adobe
> Flash Player itself, but ScreenVideo2 makes dramatic improvement in file
> size over ScreenVideo (currently in ffmpeg as flashsv) - and should be very
> useful for uploading screencasts, etc.  Most options (block size, etc) now
> just fall back on defaults because I couldn't find a general algorithm that
> produced consistantly better results than these.  All the code is in place
> to be able to change these parameters dynamically, so future improvements
> there should be easy.  The patch is attached.
> The codec is listed as flashsv2 in ffmpeg.

How did you figure out the format? I only ask because I don't know 
anyone who has been able to figure it out based on the official Adobe 
documentation (that I helped write). :)

     -Mike Melanson

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