CCWGTV - audio transcode results in HEVC transcoding to H264 and media will not play

Plex Players Streaming Devices
1

I have a Chromecast with Google TV (4k) connected to a fairly old TV which doesn’t support Dolby Digital or DTS, only PCM.
My server is the Nvidia Shield TV.

When I play a file with say a DD+ Atmos soundtrack, the server tries to transcode the video from HEVC to H264 and the file doesn’t play, I just get a spinning circle.
If I change the settings on the CCWGTV to force Dolby format then the file plays fine as HEVC but obviously I don’t get any sound.

Why is PMS transcoding the video rather than direct playing it and just transcoding the audio?

I also have a HD version of the CCWGTV and it’s even worse, some 4k files that play fine with the 4k version just play sound and no video.

2

When audio has to be transcoded from a HEVC file, it will transcode the video to x264.

3

After exhaustive testing the culprit is “Enable HDR tone mapping”.
With this enabled everything that needs transcoding just spins.
Disabling this and the files play ok, just a bit washed out.

I ended up returning the HD version of the CCWGTV, it just does not work well with Plex at all, any 4k files that transcoded to 1080p just had audio with a black screen.

Even the CCWGTV 4k version isn’t great, the way it handles Dolby is terrible, I don’t think it handles any downmixing so it forces everything to transcode, whereas the Firestick 4k plays everything without transcoding despite my old TV not supporting DD or DTS.

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