Inconsistent playback of 4k UHD across devices and apps

[fuelraccoon12]

Can you try remuxing one of these files with this ffmpeg command?

Open a command prompt

Code:

cd C:\Program Files\Jellyfin
ffmpeg.exe -fflags +genpts+igndts -i "C:\path\to\video.mkv" -map 0 -codec copy -max_muxing_queue_size 2048 -max_interleave_delta 0 -avoid_negative_ts disabled newFile.mkv

Much appreciated. Ran that and reviewing the file now and will follow up. Can you tell me what we're doing with this?

If your friends are not on WAN which might have issues with such high bitrate files, did you put your transcode cache on a slow disk where it will suffer when huge IO writes?

Also, the server will update databases during the playback for status updating, which means the jellyfin database should be put on an SSD at best. Hanging in IO thread could also cause what you described.

Your symptoms mostly look like an IO hang to me and that is usually caused by too slow disks.

Should have included that information in the original post. Everything is LAN local, wired connection. Jellyfin, database, and transcoding directories on SSD, Samsung 970 Evo Plus. The actual video track is on the aforementioned Storage Spaces array, spinning disks.

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Can you try remuxing one of these files with this ffmpeg command?

Open a command prompt

Code:

cd C:\Program Files\Jellyfin
ffmpeg.exe -fflags +genpts+igndts -i "C:\path\to\video.mkv" -map 0 -codec copy -max_muxing_queue_size 2048 -max_interleave_delta 0 -avoid_negative_ts disabled newFile.mkv

Same behavior on my PC, playing in Brave web browser, Direct Streaming. Stuttering at same spot. File size did change, increased about 2100 KB. Is this test enough or should I look at other playback?