Doom9's Forum - View Single Post - Evaluation of HEVC decoders (SW, Hybrid and HW)

cyberbeing · 24th September 2014, 18:46

I don't even have the driver from my CPU's HD4000 installed and it's disabled in the BIOS, so it's impossible that it would be used.

LAV added support for both DXVA2 & CUVID on supported NVIDIA cards (Kepler and newer?).

Use of the CUVID or DXVA2 Copyback modes is of course much slower than DXVA2 Native, especially since I'm only using a PCI-E 3.0 x8 link. Though GPU & CPU usage is also much lower when benching in these modes, since the hybrid decoder seems to become heavily bottlenecked by 3840x2160 copyback performance.

For example:

Ducks-2160p@50fps-4Mbps
LAV x64 DXVA Native (Null) 193/197/198
LAV x64 CUVID (Null) 73/78/78
LAV x64 DXVA Copyback (Null) 69/73/73

Fitness-2160p@30fps-8Mbps
LAV x64 DXVA Native (Null) 100/113/146
LAV x64 CUVID (Null) 50/57/70
LAV x64 DXVA Copyback (Null) 49/55/66

Beauty-2160p@30fps-12.3Mbps
LAV x64 DXVA Native (Null) 78/86/87
LAV x64 CUVID (Null) 43/51/55
LAV x64 DXVA Copyback (Null) 41/48/50

24th September 2014, 18:46	#18 \| Link
cyberbeing Broadband Junkie Join Date: Oct 2005 Posts: 1,859	I don't even have the driver from my CPU's HD4000 installed and it's disabled in the BIOS, so it's impossible that it would be used. LAV added support for both DXVA2 & CUVID on supported NVIDIA cards (Kepler and newer?). Use of the CUVID or DXVA2 Copyback modes is of course much slower than DXVA2 Native, especially since I'm only using a PCI-E 3.0 x8 link. Though GPU & CPU usage is also much lower when benching in these modes, since the hybrid decoder seems to become heavily bottlenecked by 3840x2160 copyback performance. For example: Ducks-2160p@50fps-4Mbps LAV x64 DXVA Native (Null) 193/197/198 LAV x64 CUVID (Null) 73/78/78 LAV x64 DXVA Copyback (Null) 69/73/73 Fitness-2160p@30fps-8Mbps LAV x64 DXVA Native (Null) 100/113/146 LAV x64 CUVID (Null) 50/57/70 LAV x64 DXVA Copyback (Null) 49/55/66 Beauty-2160p@30fps-12.3Mbps LAV x64 DXVA Native (Null) 78/86/87 LAV x64 CUVID (Null) 43/51/55 LAV x64 DXVA Copyback (Null) 41/48/50 Last edited by cyberbeing; 24th September 2014 at 19:17.