[Ffmpeg-devel] ScreenKast exporting
Mon Aug 28 22:08:36 CEST 2006
Bram Biesbrouck a ?crit :
> Here's the concept: the recording is stored as zlib-compressed rect-updates,
> that get decompressed on the fly and drawn to an OpenGL canvas, together with
> text-balloons, commentboxes, etc. Currently, the ffmpeg export-code grabs
> that (entire) OpenGL canvas every time something changes, but this is too
> costly, because often, only small areas get updated.
Well, I suppose you could reuse the motion estimation routines from
FFmpeg... but I imagine you'd need to have some video-compression
background to make some sense out of them.
If you grep through the source tree, you should get some of these
routines. I imagine that you'd just have to look at which functions
calls them to piece by piece get a grasp of what has to be done to run a
simple motion compensation algorithm.
You may also wanna dig the ml for a patch that added H.264 encoding support.
I'd give you an idea of what's needed to build an encoder, though H.264
isn't the easiest codec when you're a beginner.
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