Scrubbing not working for transcoded HEVC

[Cyboc]

Quick technical summary:
- Jellyfin is running as a docker container (linuxserver, latest)
- Container host runs on J4205 CPU (iGPU should be used for transcoding)
- /dev/dri/renderD128 is passed through to container
- VAAPI is enabled for hardware acceleraction (but issue also present without hardware acceleration)
- Jellyfin Version: 10.8.11
- Architecture: X64

So my issue is that my hevc media cannot be scrubbed anymore, skipping to a specific timestamp gets the playback stuck and after a while the first frame is shown again, not playing back anymore. This has been tested with different clients (Android App, Browser) and it occurs when the client is not able to DirecPlay the media. The transcoding logs show that when skipping to a timestamp (e.g. in the middle of the movie), ffmpeg quits and multiple new transcoding logs are created, one after another.

Transcoding log before skipping:

Code:

...
[hevc @ 0x55ae128a9780] VPS 0 does not exist
[hevc @ 0x55ae128a9780] SPS 0 does not exist.
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_vaapi))
  Stream #0:1 -> #0:1 (ac3 (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
Output #0, hls, to '/config/data/transcodes/000594aacf89311ae8e021fefd64f141.m3u8':
  Metadata:
    encoder        : Lavf60.3.100
  Stream #0:0: Video: h264 (High), vaapi(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 9422 kb/s, 23.98 fps, 90k tbn
    Metadata:
      DURATION        : 01:57:36.758000000
      encoder        : Lavc60.3.100 h264_vaapi
  Stream #0:1: Audio: aac, 48000 Hz, stereo, s16, 384 kb/s (default)
    Metadata:
      DURATION        : 01:57:36.864000000
      encoder        : Lavc60.3.100 libfdk_aac
frame=    0 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed=  0x   
frame=  60 fps=0.0 q=-0.0 size=N/A time=00:00:02.68 bitrate=N/A speed=5.11x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1410.ts' for writing
frame=  140 fps=136 q=-0.0 size=N/A time=00:00:06.05 bitrate=N/A speed=5.88x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1411.ts' for writing
frame=  215 fps=140 q=-0.0 size=N/A time=00:00:09.19 bitrate=N/A speed=  6x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1412.ts' for writing
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1413.ts' for writing
frame=  292 fps=144 q=-0.0 size=N/A time=00:00:12.39 bitrate=N/A speed=6.09x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1414.ts' for writing
frame=  367 fps=145 q=-0.0 size=N/A time=00:00:15.53 bitrate=N/A speed=6.12x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1415.ts' for writing
frame=  448 fps=147 q=-0.0 size=N/A time=00:00:18.88 bitrate=N/A speed=6.21x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1416.ts' for writing
frame=  525 fps=148 q=-0.0 size=N/A time=00:00:22.08 bitrate=N/A speed=6.24x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1417.ts' for writing
frame=  603 fps=149 q=-0.0 size=N/A time=00:00:25.34 bitrate=N/A speed=6.27x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1418.ts' for writing
frame=  685 fps=151 q=-0.0 size=N/A time=00:00:28.77 bitrate=N/A speed=6.34x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f1419.ts' for writing
frame=  768 fps=152 q=-0.0 size=N/A time=00:00:32.23 bitrate=N/A speed=6.39x   
[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f14110.ts' for writing


[q] command received. Exiting.

[hls @ 0x55ae12897200] Opening '/config/data/transcodes/000594aacf89311ae8e021fefd64f14111.ts' for writing
frame=  802 fps=153 q=-0.0 Lsize=N/A time=00:00:33.45 bitrate=N/A speed=6.39x   
video:15086kB audio:1578kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

And one file after skipping:

Code:

...
[hevc @ 0x562184ac0500] VPS 0 does not exist
[hevc @ 0x562184ac0500] SPS 0 does not exist.
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_vaapi))
  Stream #0:1 -> #0:1 (ac3 (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[hevc @ 0x562184ac0500] PPS id out of range: 0
[hevc @ 0x562184ac0500] Error parsing NAL unit #0.
[hevc @ 0x562184ad3bc0] PPS id out of range: 0
[hevc @ 0x562184ad3bc0] Error parsing NAL unit #0.
[hevc @ 0x562184afb680] PPS id out of range: 0
[hevc @ 0x562184afb680] Error parsing NAL unit #0.
[hevc @ 0x562184fbfa40] PPS id out of range: 0
[hevc @ 0x562184fbfa40] Error parsing NAL unit #0.
Error while decoding stream #0:0: Invalid data found when processing input
[hevc @ 0x562184fd1980] PPS id out of range: 0
[hevc @ 0x562184fd1980] Error parsing NAL unit #0.
[hevc @ 0x562184ac0500] PPS id out of range: 0
[hevc @ 0x562184ac0500] Error parsing NAL unit #0.
Error while decoding stream #0:0: Invalid data found when processing input
[hevc @ 0x562184ad3bc0] PPS id out of range: 0
[hevc @ 0x562184ad3bc0] Error parsing NAL unit #0.
Error while decoding stream #0:0: Invalid data found when processing input
[hevc @ 0x562184afb680] PPS id out of range: 0
[hevc @ 0x562184afb680] Error parsing NAL unit #0.
Error while decoding stream #0:0: Invalid data found when processing input
    Last message repeated 1 times
....

Is anyone running a similar setup successfully or can help me to identify a solution? I really would appreciate any kind of help!