SOLVED: Playback error on 10-bit h264

[TheDreadPirate]

You could extract the subs and have them be external subs.

[duckrental]

I tried repackaging in a .mp4 file (without the subtitles); the same problem occurs.

Also, I've realized my initial statement that files with default sub tracks work fine is incorrect - one of the problem files I gave mediainfo for does have a default sub track. For comparison, here's mediainfo for another file, also h.264 10-bit, which works fine: https://pastebin.com/hCCG00DZ (I have edited the original post to reflect this)

[TheDreadPirate]

Finally got my Roku (for testing) setup.  I have a couple 10-bit H264 videos and they transcode successfully.

   

What OS is your Roku running? Even with my short time with this Roku it didn't update to the latest version without my prodding it and manually checking. There were a bunch of weird audio playback issues before I checked for an OS update (was on 11 now on 12). Jellyfin-Roku 2.0+ requires Roku OS 12+.

[duckrental]

I have two Roku devices, a Roku Ultra running 12.5.5 and a TCL Roku TV running 12.5.0; the issue is common to both. I'm not convinced this is a client issue, though, since the logs seem to imply the client is correctly requesting a transcode.

[tmsrxzar]

TDP can you try without subtitles in your file, from your screenshot it needed transcode for video+subtitle

in the log it works fine when that happens
TranscodeReason=SubtitleCodecNotSupported, VideoProfileNotSupported, VideoBitDepthNotSupported


but the failing file from the log only transcodes for
TranscodeReason=VideoProfileNotSupported, VideoBitDepthNotSupported

[TheDreadPirate]

No change.  Still transcodes successfully without subtitles.

   

[tmsrxzar]

just leads back to a wtf then, i have no further ideas

[duckrental]

To get an idea of how common the issue is, I went through and tried every 10-bit h.264 thing I have (or at least everything in my anime folders, because nothing else ever uses it). I found 24 series, 8 of which are affected, and 33 movies, 20 of which are affected. There's nothing obvious the affected ones have in common, except that it seems that if one episode of a release is affected, so are the rest (at least from what I've seen; I didn't check literally every file).

[duckrental]

After further investigation, I have identified the difference - the encoding level. It looks like every file that fails is encoded at level 5, and every file that works is encoded at level 3 or 4.

[TheDreadPirate]

But it should still trigger a transcode regardless.

Go ahead and submit an issue here.

https://github.com/jellyfin/jellyfin/issues

The only thing that makes sense is that there is some weird bug/interaction between Intel's drivers, your older CPU/iGPU, and Jellyfin.

Try checking if your motherboard has an updated BIOS? I've seen BIOS updates resolve some weird bugs for other users (as suggested by our resident ffmpeg expert, NyanMisaka).