AppleTV 4K (1st gen) playback issues with HECV MKV file (transcoding?)

Hi there, looking for some help as I can’t seem to resolve this one no matter what settings I play with..

AppleTV 4K 1st gen is trying to play it back. Latest Plexpass server installed on a Synology DS918+ (64-bit), and using latest app on AppleTV device.

This file plays back fine on a stereo setup LG C1 TV in another room (on the native Plex app on the LG platform). However, it plays back with distorted colours. Web player does the same.

Subtitles are not enabled, playback settings are to “play original quality”, full dynamic range, as you can see below it only has one audi o track, and subtitles are OFF.

When I play the file on the AppleTV 4K 1st gen, it plays the audio, but has a spinning disc. I tried enabled the video diagnostics but it won’t even display those. The appleTV reports this:

Source: Transcode (server name)
Quality 1920x1080 @ 12.5 Mbps
Video Copy (HEVC)
Audio Copy (EAC3)
Player AVPlayer
Transcode reason App cannot direct play this item. no direct play video profile exists for protocol http, with container mkv, and video codec hevc.

Tautulli tells me the following:

  • PRODUCT Plex for Apple TV

  • PLAYER Apple TV

  • QUALITY Original (6.0 Mbps)

  • STREAM Direct Stream

  • CONTAINER Converting (MKV MP4)

  • VIDEO Direct Stream (HEVC 1080p)

  • AUDIO Direct Stream (EAC3 5.1)

  • SUBTITLE None

The AppleTV itself is set to to “off” where it says 'auto adjust quality" - which seems to have fixed my reported symptoms for others when I’ve searched. I’ve enabled and disabled to ensure it’s set.

The file info is here:

Media

  • Duration 53:07
  • Bitrate 5323 kbps
  • Width 1920
  • Height 1080
  • Aspect Ratio 1.78
  • Video Resolution 1080p
  • Container MKV
  • Video Frame Rate 24p
  • Video Profile main 10

Part

  • Duration 53:07

  • Show_WEB-DL.DDP5.1.DoVi.HEVC-NTb.mkv

  • Size 1.98 GB

  • Container MKV

  • Video Profile main 10

  • Codec HEVC

  • Bitrate 5323 kbps

  • D O V I B L Present true

  • D O V I Level 3

  • D O V I Present true

  • D O V I Profile 5

  • D O V I R P U Present true

  • D O V I Version 1.0

  • Bit Depth 10

  • Chroma Location left

  • Chroma Subsampling 4:2:0

  • Coded Height 1080

  • Coded Width 1920

  • Color Range pc

  • Frame Rate 23.976 fps

  • Height 1080

  • Level 4.0

  • Profile main 10

  • Ref Frames 1

  • Width 1920

  • Display Title 1080p DoVi (HEVC Main 10)

  • Extended Display Title 1080p DoVi (HEVC Main 10)

  • Codec EAC3

  • Channels 6

  • Bitrate 640 kbps

  • Language English

  • Language Tag en

  • Audio Channel Layout 5.1(side)

  • Sampling Rate 48000 Hz

  • Display Title English (EAC3 5.1)

  • Extended Display Title English (EAC3 5.1)

  • Codec SRT

  • Language English

  • Language Tag en

  • Display Title English (SRT)

  • Extended Display Title English (SRT)

  • Codec SRT

  • Language English

  • Language Tag en

  • Hearing Impaired true

  • Title SDH

  • Display Title English SDH (SRT)

  • Extended Display Title SDH (English SRT)

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