Can't fast forward or rewind MKV files on Fire TV Stick

[Gigabit]

Are you certain the problem files are also direct playing on other devices?  What you are describing usually indicates that there is something wrong with the MKV container.  Though the video and audio are usually fine.

What you can try is remuxing the file to repair any issues with the MKV container.

Code:

/usr/lib/jellyfin-ffmpeg/ffmpeg -fflags +genpts+igndts -i "/path/to/problem/video.mkv" -map 0 -codec copy -max_muxing_queue_size 2048 -max_interleave_delta 0 -avoid_negative_ts disabled newFile.mkv

If you are running Windows I can provide a Windows version.  If you are using docker, you can open a bash shell into the container to run that command.

This is what it says when playing the same file on Edge.



I get that you think the container is broken but that doesn't explain why every media player, device etc has worked except for the Fire TV Stick? It even plays fine on Just Player, VLC, Kodi on the same device.

I do think this is a Jellyfin bug, what information can I provide so you can fix it?