Mac PMS Transcoding and I cannot work out why

Server Version#: 1.16.3.1402
Player Version#: tvOS 2.5.1 (12901)

I have just bought an Apple TV 4K to replace an ageing Mac Mini as my media player, connected to my TV. My media is on a NAS, my PMS is a 2019 Mac Mini (dedicated to PMS). NAS and Mac Mini are connected via 10GB Ethernet to a 10GB switch, which is connected to a 10GB/1GB switch via a 10GB port. Jumbo frames are turned on on the 10GB interfaces. The Apple TV is connected to a 1GB port on the 10GB/1GB switch. ATV connected to LG C8P via HDMI.

My media files are all MP4 (H264), AAC 5.1. Everything I try and watch continually pauses and even when the video plays I often lose the sound. Whilst transcoding the bandwidth graph is up and down continually. I’ve attached some logs from a recent session.

Both the server and the ATV have quality set too maximum. Direct Play is on, etc etc.

Plex Media Server Logs_2019-07-30_19-45-08.zip (3.9 MB)

I’d welcome any ideas on why the transcoding is happening.

Thanks.

search or monitor the logs for the lines with MDE:

and they will provide info on why plex is decided to transcode.

Thanks.

Just had a dig through the logs and found messages as follows:

“Selected protocol hls; container: mpegts”

“Direct Play is Disabled”

“media must be transcoded in order to use the hls protocol”

“Cannot direct stream audio due to profile or setting limitations”

Not sure if this means I have made in mistake when converting the files, or whether I have PMs setup incorrectly, or the end user device (Apple TV) is not setup properly?

Jul 30, 2019 19:38:54.561 [0x70000fa32000] DEBUG - The Landlord’s Daughter - audio.channels limitation applies: 6 > 2

The AppleTV cannot passthrough 5.1 AAC audio, only 5.1 AC3 so PMS is transcoding the audio to that. The video is not being transcoded.

If you are not using a receiver or don’t care for 5.1 audio, you can turn off the pass through option which will then use 5.1 AAC which will be decoded on the device to 2 channel.

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