video is unseekable

[BobDLA]

Hi,
Thanks for your great work.
I have some videos that could play and seekable by vlc(one demo as the attachment), but got "Video track is unseekable" when FFMS_CreateVideoSource.
Could you help to check what cause the error and how to workaround?
System info :
Ubuntu 20.04 , ffmpeg version 4.2.7, ffms with commit ff61bca
(other system should have the save issue also)

Thanks

test.mp4

[myrsloik]

A bit late to reply but this happens when FFmpeg can't seek to the first frame in a file successfully meaning that it can never rewind all the way. Sometimes FFmpeg is this way. Exactly why it fails here I have no idea, mp4 usually works flawlessly. Open with Seekmode=-1 or 0 I guess. Or use BestSource that's a bit more reliable for small clips.