4k Transcoding Stops

[jawlessemu]

On certain 4k videos the transcoding appears to stop after a few seconds of playing. there is no error associated. The video just closes and returns to main jellyfin screen. I am trying to play on a 4k roku tv using the rokiu jellyfin app. i am running a ryzen 5600g with apu, 16GB ram. 

Below is the transcode log.

  FFmpeg.Transcode-2024-04-05_16-44-37_6d4ef85ce46c1728537747b8b265c292_8dac3476.docx (Size: 20.34 KB / Downloads: 63)

[TheDreadPirate]

The video is Dolby Vision Profile 7.6. It is transcoding to HEVC with an SDR color space but it is retaining the DV7.6 side channel data. I am betting that this is causing the issue, the DV side channel data, since only bluray player support the 7.6 profile.

As a workaround, try turning off "Allow encoding in HEVC format" in Dashboard > Playback on the server. I think it should discard the DV 7.6 side channel if it is transcoded to H264.

[jawlessemu]

Ok tried that didn't work. I was wondering if it could be that the hard drives are too slow. The Video File size is 140GB. and after trying to play 3-4 times the movie will begin to play with occasional stutters. the hard drives are a Seagate exos x20 20 tb enterprise, and a Seagate exos x16 16tb enterprise. those drives are dedicated to jellyfin only. I also run the rest of the system on a Western Digital 1TB WD Green SN350 NVMe drive.

[TheDreadPirate]

The bit rate of the video is much lower than the throughput of your HDD.  That is definitely not the problem.

Do you have tone mapping enabled?  I have some DV 7.6 content and also a Roku 4K Ultra (4800X).  When I played it the video was transcoded to HEVC without the DV 7.6 side channel.

[gnattu]

Try disable hevc in your Roku settings. The transcoding does not stop from the log but your client seems to have problem decoding that.

[jawlessemu]

  FFmpeg.Transcode-2024-04-06_06-41-54_1529a56083578f11e17de6ccec8b89b5_5e6bfa0b.txt (Size: 169.9 KB / Downloads: 43)
ok so i tried all suggestions turning off tone mapping and disabling HVEC on the roku. I also tried playing a different video were i was having the same issue as before trying the suggestions. The result was the same video doesn't start. Here is the log file for that video.[attachment=2987][attachment=2987][attachment=2987][attachment=2987][attachment=2987]

[toytown]

Can you try also playing back the video via a browser, see if we can rule out it being a server issue? I have the exact same files and its playing back perfect here via browser/android device (i don't have a roku to try) whilst transcoding.

[jawlessemu]

so i tried with browser and it transcodes and skips. however when i play via windows jellyfin standalone media player app it direct plays smooth as butter. i also used my android jellyfin app and it also plays smooth

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the issue seems to be limited to roku app and my web browser which is google chrome.