> Interesting. > May I ask which application, which container (avi, mov, mkv, ...) and > which version of ffv1 (1 or 3) you are using? I usually using Zeranoe FFmpeg builds, encoding to avi container, not know what version ffv1, just filled in vcodec , opening by avisynth (2.5.8) script with FFVideoSource (google code ffms2-2.18-rc1.7)