Hi, I think there is a problem with matroska file seeking : the demuxer find the nearest keyframe but it could be annoying if you have small seek time (for exemple 1s) because if you are near the next keyframe and you do "seek -1" the position in the movie will go to the next key frame and not the last, also with this small time seeking it is imposible to rewind : you stay on the last keyframe : alsa-space: free space = 65536, status=141110472, prepared -- [mkv] SEEK, relss: -1,000, flags: 00,018 524/524 0% 0% 0,0% 0 6 0% [mkv] New timecode: 15890 alsa-space: free space = 65536, status=141110472, prepared -- [mkv] SEEK, relss: -1,000, flags: 00,014 525/525 0% 0% 0,0% 0 6 0% [mkv] New timecode: 15890 alsa-space: free space = 65536, status=141110472, prepared -- [mkv] SEEK, relss: -1,000, flags: 00,018 527/527 0% 0% 0,0% 0 6 0% [mkv] New timecode: 15890 alsa-space: free space = 65536, status=141110472, prepared -- [mkv] SEEK, relss: -1,000, flags: 00,140 659/659 7% 47% 1,1% 0 6 0% [mkv] New timecode: 23898 alsa-space: free space = 65536, status=141110472, prepared -- [mkv] SEEK, relss: -1,000, flags: 00,083 677/677 6% 47% 1,3% 0 6 0% [mkv] New timecode: 23898 alsa-space: free space = 65536, status=141110472, prepared -- [mkv] SEEK, relss: -1,000, flags: 00,062 690/690 7% 47% 1,5% 0 6 0% [mkv] New timecode: 23898 Could be possible to have a seeking like avi which haven't this anoying isue. Thanks Matthieu