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FFMS / ffms2

An FFmpeg based source library and Avisynth/VapourSynth plugin for easy frame accurate access
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video is unseekable #407

Closed BobDLA closed 1 year ago

BobDLA commented 2 years ago

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 ff61bca13e2c5fb99c0450620c9244f415ec29c4 (other system should have the save issue also)

Thanks

https://user-images.githubusercontent.com/3804610/186893184-8e549fd8-56b1-4607-b1b8-e43c304fb540.mp4

myrsloik commented 1 year ago

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.