•   
  • 1
  • 4
  • 5
  • 6
  • 7
  • 8(current)
2017 Apple TV 4K - using the Kodi fork - MrMC review
OK - an update - found the Codec info screen from settings in MrMc.

I have a feeling the Apple TV 4K may be hardware decoding this 4:2:2 2160p50 HEVC? The sample clip plays in MrMC (with terrible A/V sync) with a reported CPU load of just 11%, and the video codec is reported as 'hevc (Rext)'. There were 14 skipped frames, none dropped.  (Could 'Rext' suggest it's being played by an external hardware player in tvOS?)

My AVCi100 100Mbs 4:2:2 1080i25 (containing a 1080p25 source) plays OK, albeit with a reported CPU ~201% load, and is reported as 'h264 (High 4:2:2 Intra)'. There were 3 skipped frames, none dropped. (This doesn't play reliably - sometimes it refuses to play)

(Yes I realise MrMC isn't Kodi - but the Apple TV 4K is a very versatile and powerful platform - and one of the only platforms that has automatic frame rate switching on the major DRM services like Netflix and Amazon Prime...) It also has limitations with regard to HD Audio bit streaming (no DTS:x or Dolby True HD with Atmos), and also has 23.976 vs 24.000 and 59.94 vs 60.00 issues in some situations AIUI?
Reply
I wonder if anyone can help?

I'm playing back a 2160p24 HDR file (.mkv) that has a TrueHD Atmos audio encode. This is reflected in the MrMC info stats. However, when the ATV outputs it to my TV, it seems to be decoding it and sending it out as LPCM, as the TV isn't indicating it's receiving either a TrueHD nor Atmos audio track. I've checked the ATV and MrMC settings and they seem fine. I am using the free version of MrMC though, is that the issue?

Paul
Reply
The ATV doesn't support passthrough of audio tracks, so MrMC decodes it and sends as LPCM. The only Atmos that's supported is EAC3+Atmos.
Denon X6500H 7.2.4 -> LG OLED65C9P
Main: Odroid N2 CoreELEC
Other Devices: Apple TV 4K, RPi 4, NVIDIA Shield Pro (2017)
Retired devices: Zidoo X9S, Xiaomi Mi Box, All the old RPi’s
Reply
(2020-07-03, 16:18)timstephens24 Wrote: The ATV doesn't support passthrough of audio tracks, so MrMC decodes it and sends as LPCM. The only Atmos that's supported is EAC3+Atmos.

Thanks. I thought it stripped the Atmos extension data from the TrueHD stream and just sent it as TrueHD. Must have misread.

Paul
Reply
  •   
  • 1
  • 4
  • 5
  • 6
  • 7
  • 8(current)



Logout Mark Read Team Forum Stats Members Help
2017 Apple TV 4K - using the Kodi fork - MrMC review2
This forum uses Lukasz Tkacz MyBB addons.