Synology ds918+ hw transcoding 4k not working

Server Version#: 1.19.1.2701
Player Version#:

I run plex server on my Synology ds918+. Bought Plex Pass in order to use hw-transcoding and thought I should be able to play most kind of videos. When I try to play a video on my Apple TV 4k using the Plex App (experimental player) it takes like 1 minute before it starts playing and after that, I can watch a couple of seconds before I get some popup saying that the server could not handle this video. If I use Infuse on my Apple TV, the video plays without any problem. All my devices are connected trough wired gigabit ethernet. Is this expected? I thought my synology in combination with plex pass were supposed to be able to handle this or was I wrong?

The media file I am trying to play is:

  • Codec HEVC
  • Bitrate 42076 kbps
  • Bit Depth 10
  • Chroma Subsampling 4:2:0
  • Coded Height 2080
  • Coded Width 3840
  • Color Primaries bt2020
  • Color Range tv
  • Color Space bt2020nc
  • Color Trc smpte2084
  • Frame Rate 23.976 fps
  • Height 2076
  • Level 5.1
  • Profile main 10
  • Ref Frames 1
  • Width 3840
  • Display Title 4K (HEVC Main 10 HDR)

May I see the log files please?

It might be better if you :

  1. Start Playback
  2. Let play for 15 seconds
  3. Stop Playback
  4. Wait 30 seconds for logs to flush
  5. Settings - Server - Troubleshooting - Download logs
  6. Attach the ZIP file here.

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