[Ffmpeg-devel] ScreenKast exporting

Bram Biesbrouck b
Thu Aug 31 21:58:43 CEST 2006

On Tuesday 29 August 2006 17:30, Karl H. Beckers wrote:
> Hi all,
> isn't the summary of this kinda:
> Bram wants to use ffmpeg to encode but then only hand the bits that
> change to the encoder. If I'm not completely mistaken, that's the major
> task of most encoders, finding out what it is that has changed and then
> only storing the deltas. Hence it sounds like what Bram's asking for is
> a way to tell the encoder "only look at this or that part of the frame"
> which is like encoding the input to the encoder, which again sounds like
> it can only make a lot of sense if you can find out what changed more
> quickly than the encoder could, which is prolly only the case if you
> KNOW what's changed without having to determine it or if you have found
> a clever motion detection algorithm. And then you could just add that to
> a codec, no?

Yes, this is exactly what I'm looking for. I know what changed, no need to 
calc any delta's. The only thing I need to know is: how do I tell the 
encoder: "You only need to look at this rectangle, all the rest didn't 
If someone could help me with that, I guess the export-time would be reduced a 

> I'm in a similar situation, and if I could know what changed I wouldn't
> need to get a complete new frame, but capture a potentially much smaller
> part and insert it into the old frame, but I can't see how you would
> determine what's changed in the new frame without looking at it (and
> therefore getting it first).
> Karl.
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