AMD GPUs encoding/decoding limit?

[WereCatf]

Do AMD GPUs have a limit on the number of simultaneous encodes or decodes? NVIDIA does have a 2-job limit on encoding with consumer-hardware, but e.g. Intel doesn't have any such and the only limits come simply from the physical amount of resources the iGPU has.

[emosun]

dont think theres a limit. Just keep opening video files and see how many videos can run at a single time I think you'll run out of screen real estate before you hit the limit

[mariushm]

I think the limit is 16 simultaneous streams but when it comes to encoding, you have additional limitations

 

See https://github.com/obsproject/obs-amd-encoder/wiki/Hardware-Support#AVCSVC_H264-6

Scroll down all the way to the bottom ... VCE 3.4 is used on RX 4xxx and higher, VCE 4.0 is used on Vega

 

For encoding you have here the maximum fps depending on quality profile you choose :

VCE 3.4 : https://github.com/obsproject/obs-amd-encoder/wiki/Hardware-VCE3.4

 

Values for RX 480 (should be about the same for RX 570 / RX 580 etc)

Res. 		Speed 	Balanced Quality Speed 	Balanced Quality
		AVC 			HEVC 		
	
426x240 	1605,1 	1374,4 	921,4 	960,0 	961,1 	957,7
640x360 	957,1 	758,5 	462,0 	915,2 	492,8 	489,8
854x480 	598,0 	462,3 	270,8 	486,1 	483,0 	482,2
960x540 	497,9 	378,0 	217,4 	483,8 	328,9 	328,7
1280x720 	297,5 	223,7 	126,1 	246,1 	245,2 	245,7
1366x768 	262,8 	197,7 	111,2 	244,9 	220,6 	214,9
1920x1080 	135,5 	102,4 	56,6 	141,3 	124,0 	123,8
2560x1440 	79,1 	58,8 	32,2 	82,6 	71,1 	71,2
3840x2160 	35,8 	26,4 	17,8 	36,9 	33,2 	33,2
16:10 	- 	- 	- 	- 	- 	-
1280x800 	269,8 	201,9 	113,8 	246,5 	245,3 	245,8
1440x900 	213,9 	159,9 	89,2 	196,8 	165,3 	165,4
1920x1200 	125,0 	93,1 	51,3 	123,6 	110,5 	110,3