[Ffmpeg-devel] Optimizing encoding when knowing changed area

[Oleg Oksyuk]

Hello everyone,
 
I use ffmpeg to encode graphics animation produced by another program. The
contains API interface that allows to get output pixmap in RGB format and
changed area, for example (100, 100) - (200, 300). 
When encoding MPEG using FFMPEG I simply convert changed area from RGB to
YUV each 1/30 of second. But often nothing was changed or only some small
rectangle was changed. Are there any way to use knowledge about changed area
to optimize encoding?
 
Thanks,
Oleg