The png codec in ffmpeg can result large pngs in certain cases. I know pngs are supposed to be non-lossy but there are libraries such as libpngquant that difference between the pixel and the value predicted by the average filter.
Ffmpeg doesn't seem to support these libraries. It will be great if it could. Does anyone know if this is planned? How easy is it to port libpngquant over to ffmpeg's png encoder?