Playback stutter of files with completely equal encodeding; both H265 and H264

Plex Players Streaming Devices
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1

Server Version#: 1.31.1.6733 (Synology NAS DS920+ and PlexPass)
Player Version#: 4.102.1

I have multiple video files using 8b HEVC encoding. Files from a certain season play back perfectly fine, while files from another season (exact same encoding; checked with MediaInfo) need to buffer for 3s and then can play for 2s.
Even after converting the files to 8b H264 encoding the stutter remains.

This behaviour is found on all my playback devices (web; Chromecast and inbuilt Samsung app). How can I solve this issue?

Hardware acceleration is enabled.

2

May I have the server DEBUG logs please ??

I don’t know what’s happening without them :slight_smile:

3

Here are the logs, hope they suffice.
I played back two files; the first one is the one that stutters and the second one plays nicely in high res.

Plex Media Server.log (1.5 MB)
Plex Transcoder Statistics.log (109.1 KB)
plex_web_debug.log (676.3 KB)

4

I apologize for the delay. I didn’t get notified of this until now.

Your log fragment tells me what’s happening.

  1. You have subtitles in the file
  2. The player (ChromeCast) is requiring the subtitles be burned into the video stream.
  3. Synology NAS machines don’t have a fast enough CPU to do this in real-time
  4. In all other regards, the HW transcoding is working.
Mar 07, 2023 11:27:16.543 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] Cleaning directory for session mznjvq2rplzeypsh5ygghz9l ()
Mar 07, 2023 11:27:16.544 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] Starting a transcode session mznjvq2rplzeypsh5ygghz9l at offset -1.0 (state=3)
Mar 07, 2023 11:27:16.544 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] TPU: hardware transcoding: using hardware decode accelerator vaapi
Mar 07, 2023 11:27:16.544 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] TPU: hardware transcoding: zero-copy support present
Mar 07, 2023 11:27:16.544 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] TPU: hardware transcoding: not using zero-copy because subtitle burning is required
Mar 07, 2023 11:27:16.544 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] [Universal] Using local file path instead of URL: /volume1/plex_content/Series/The Big Bang Theory/The Big Bang Theory (2007) Season 10 S10 (1080p BluRay x265 HEVC 10bit AAC 5.1 Vyndros)/The.Big.Bang.Theory.S10e06.The.Fetal.Kick.Catalyst.1080P.10Bit.Bluray.Aac5.1.Hevc-Vyndros.mkv
Mar 07, 2023 11:27:16.544 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] Codecs: hardware transcoding: testing API vaapi
Mar 07, 2023 11:27:16.546 [0x7f8e34ab3b38] DEBUG - [Req#67/Transcode] [FFMPEG] - Format 0x41524742 -> bgra.
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