Hardware transcode problems, Ryzen 3600+AMD RX 570

[Icy13]

Server Version#: 1.16.4.1469
Player Version#: Roku app (6.3.13.5830-82b237149-Plex)

I’m having problems (buffering, hiccups) using just one 1080 x265 to 1080x264 transcode on my Rx570 (sapphire 4gb pulse, if it’s relevant)

I tried progressively upping the throttle limit on hw encode from 90sec->5min->10min->60min.

It seems like right when the throttle buffer is exceeded, I start to have problems with hardware transcode. There is also usually a hiccup in the first 10-45sec of playback (when, it appears, transcoding is ramping up)

Swapping back to CPU (ryzen 3600), I have flawless transcode. This suggests to me that it’s no other part of my setup (or network) other than hardware vs. software transcode.

(system is ryzen 3600, 32gb ram, Rx570, server on ssd, media on hdd windows storage space)

I’ve talked to someone with an Rx570 on reddit and it seems like the issue MIGHT be x265 to x264 Hardware transcode (my card, and the reference Rx570 have Hardware chips for both). That person’s rig manages 10 1080p transcodes on a Rx570 hw decode/encode (limited only by network)

So, perhaps it is something to do with dealing with two different hardware encode/decode chips BUT I think that’s something that handled by plex, yeah?

If the issue is that x265 to x264 can’t work, then can we have either a toggle in settings or an automatic hardware/software negotiation?

[KarlDag]

You confuse some things. The cpu doesn’t use hardware transcoding, but software transcoding.

Also the rx570 supports he can transcoding, but I’m not sure it supports 10bit hdr files.

[Icy13]

Sorry if I was unclear. I posted additional specs to be clear the bottleneck can’t be any other components as they are all much more powerful than needed.

As to whether it supports hdr 10bit, not sure, but it was being triggered to transcode the file (I could see video encode in task manager for gpu, windows 10) and the quality was fine but it had frequent buffering problems as described.