SOLVED: Subtitles locking up playback

[BourbonDoc]

Good afternoon!

I'm relatively new to the home server space but have gotten a setup I'm pretty happy with running Jellyfin on TrueNAS Scale. I've run into a problem that I've been able to identify with the help of reddit searches, but I can't understand a workable solution. When I turn subtitles on for some files it ends up transcoding and making my potato of a NAS peg 100% and stutter playback so as to be unwatchable. Happens in browser (chrome and firefox), firestick, and LG tv playback. It sounds like this is an issue with file types and having to "burn in" subtitles, but I haven't found a good answer on what to do about that. I would be eternally grateful if someone could ELI5 how to mitigate this problem.

Running latest versions of all involved software as of posting. NAS is a NUC with i7-5557U CPU and 16GB ram.

Thanks in advance!

[TheDreadPirate]

Did you enable hardware acceleration?

[BourbonDoc]

I tried a few and they all crashed on playback attempt, including the Intel based one. I did try disabling HEVC and AV1 transcoding and that improved playback but still had the cpu pegged at 100%.

[TheDreadPirate]

What settings did you use? Can you share screenshots of Dashboard > Playback? CPU usage isn't unusual if the audio needs to be transcoded. As long as the video transcoding is being offloaded to the iGPU.

[BourbonDoc]

What settings did you use?  Can you share screenshots of Dashboard > Playback?  CPU usage isn't unusual if the audio needs to be transcoded.  As long as the video transcoding is being offloaded to the iGPU.

All pretty much default

[TheDreadPirate]

Select VAAPI for the hardware acceleration drop down. Then use this table (the Broadwell column) to check the appropriate codec boxes your iGPU supports (not much).

https://en.wikipedia.org/wiki/Intel_Quic...d_encoding

Do not check low power encoding nor tone mapping.

[BourbonDoc]

Select VAAPI for the hardware acceleration drop down.  Then use this table (the Broadwell column) to check the appropriate codec boxes your iGPU supports (not much).

https://en.wikipedia.org/wiki/Intel_Quic...d_encoding

Do not check low power encoding nor tone mapping.

That ended up with a little lower CPU usage (~85-90%), but playback completely stopped and wouldn't resume after a few seconds. Tried it a few times with the same result. Maybe my potato just can't handle it.

[TheDreadPirate]

How much free disk space do you have? Transcodes and remuxes are written to disk.

[BourbonDoc]

How much free disk space do you have?  Transcodes and remuxes are written to disk.

About 800Gb. Which seems like plenty.

[TheDreadPirate]

Can you a fresh jellyfin log and ffmpeg log?

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Also, what plugins do you have installed? Do you have the "Transcode Killer" plugin installed?