I’ve seen a lot of similar posts but none with any real solutions, plus I seem to have an additional wrinkle. I’m trying to watch a particular 4k movie on a Roku Ultra. The video stream as reported by Plex is 4K (HEVC Main 10 HDR. The audio is EAC3 5.1. Direct Play is set to auto, with quality s…

Remote Logging is only accessible by the devs, I can’t see them. From your PMS logs I see that tone-mapping has been triggered. Does your TV support HDR?

Playback the file on the Roku that is causing the transcode and then get me the log from both the Roku, Roku Logs | Plex Support , and your PMS, Plex Media Server Logs | Plex Support .

Thanks for the quick response. I did remote logging on the Roku, so I hope that’s acceptable. I attempted playing the file at 10:33pm Pacific time, on this account. The PMS log is attached here. (File removed)

Thanks for catching that. I had forgotten that the other difference between the three Roku Ultras is that two of them are connected to HDR TVs and the problem one is not. As an experiment, though, I tried disabling tone mapping on the server but the Roku attached to the non-HDR TV still transcodes…

I’m having trouble accessing the local logs from the Roku right now, but here’s a server log from my latest attempt, which was at 10:31pm.(File removed) (File removed)

Ok. So your TV doesn’t support 10-bit video, period. HDR or not. So PMS is transcoding it to 8-bit h264. So with tone-mapping disabled, it will look horrible, but with tone mapping enabled, the new 8-bit is color corrected.

Whether it looks terrible or not isn’t the issue. I’d like to figure out why it’s transcoding video with tone mapping disabled.

Or are you saying that because the TV doesn’t do 10-bit video, the transcoding happens whether or not tone mapping is happening? By the way, this is running in a VM, which I understand doesn’t allow hardware transcoding. If it ran on a relatively recent Intel CPU natively, would it solve the perfo…

[image] euggersh: because the TV doesn’t do 10-bit video, the transcoding happens Yes [image] euggersh: If it ran on a relatively recent Intel CPU natively, would it solve the performance issue? It could but no guarantees. 10-bit HEVC still might not be supported. You’d have to chec…

Unnecessarily transcoding video when audio needs transcoding

General Discussions

TeknoJunky January 4, 2021, 10:40pm 12

you may or may not find some additional useful info @ Plex, 4k, transcoding, and you

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Unnecessarily transcoding video when audio needs transcoding

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