--check-features differences between Windows / Linux versions

[bavdevc]

Hello Rigaya,

I tested on the same hardware (AMD 5700G) using your precompiled 7.08 version with the latest AMF 1.4.26 on Windows 10 and Linux with the latest AMD drivers.

result:
amf_linux_caps_vce_7.08.txt
amf_windows_caps_vce_7.08.txt

then I tested different supported input formats with the hardware decoder:

• H264 / 8bit -> Windows OK - Linux OK
• H265 / 8bit -> Windows OK - Linux OK
• H265 / 10bit -> Windows OK - Linux AMF_FAIL

The VCEEnc check features command returns the same on Windows and Linux:

H.265/HEVC decode features
10bit depth: yes
acceleration: Hardware-accelerated
max streams: 0

--> But the AMFVideoDecoderHW_H265_MAIN10 as input result in an AMF_FAIL - so I checked the AMF SDK - there is an example called CapabilityManager (https://github.com/GPUOpen-LibrariesAndSDKs/AMF/blob/master/amf/public/samples/CPPSamples/CapabilityManager/CapabilityManager.cpp) that shows the API features:
amf_linux_caps.txt
amf_windows_caps.txt

There are some differences between Windows and Linux: (DX11 <> Vulkan)
Windows version:

Codec AMFVideoDecoderHW_H265_MAIN10 is Hardware-accelerated
Decoder input:
Width: [32-7680]
Height: [32-4320]
Vertical alignment: 32 lines.
Interlaced support: YES
Total of 0 pixel format(s) supported:
Total of 1 memory type(s) supported:
0: HOST (native)
Decoder output:
Width: [32-7680]
Height: [32-4320]
Vertical alignment: 32 lines.
Interlaced support: YES
Total of 3 pixel format(s) supported:
0: NV12 (native)
1: BGRA
2: RGBA
Total of 1 memory type(s) supported:
0: DX11 (native)

Linux version:

Codec AMFVideoDecoderHW_H265_MAIN10 is Not supported
Decoder input:
Decoder output:

==> Does that mean the decoder AMFVideoDecoderHW_H265_MAIN10 does not work under linux because of Vulkan limitations or is this feature not implemented in the AMD amdgpu-pro stack? Or does it work at your end and I have a config error with that AMDGPU driver stack?

[rigaya]

I think result of CapabilityManager.cpp is true (AMFVideoDecoderHW_H265_MAIN10 does not work under linux) and VCEEnc detection is wrong.

Actually, VCEEncC is checking HEVC 10bit decode support by combination of AMFVideoDecoderHW_H265 support and P010 format support, which seems to be causing false detection.

I think I should updated to simply checking AMFVideoDecoderHW_H265_MAIN10 support in the future.

[bavdevc]

Thank you for the clarification!

I also did some tests with VCEEnc debug log activated:

MPEG2 Input (not supported on linux)

0122-07-27 22:53:29 4E1092C0 [AMFDecoderUVDImpl] Debug: AMFDecoderUVDImpl::Init(NV12, 1920, 1080)
[A] 00122-07-27 22:53:29 4E1092C0 [AMFVideoStreamParserImpl] Debug: AMFVideoStreamParserImpl::Init(NV12, 1920, 1080)
[A] 00122-07-27 22:53:29 4E1092C0 [AMFVideoStreamParserImpl] Debug: AMFVideoStreamParserImpl::Terminate()
[A] 00122-07-27 22:53:29 4E1092C0 [AMFDecodeEngineImplVulkan] Warning: InitDecoder() - WARRNING: Vulkan supports H264 and HEVC only for now
[A] 00122-07-27 22:53:29 4E1092C0 [AMFDecodeEngineImplVulkan] Error: ../../../../../runtime/src/components/DecoderUVD/DecodeEngines/Vulkan/DecodeEngineVulkan.cpp(79):InitDecoder() - ERROR: Vulkan decoder unsupported codec - AMF_CODEC_ID=1, width=1920, height=1080, maxWidth=0, maxHeight=0
[A] 0Failed to init decoder: AMF_FAIL

HEVC 10bit input (not supported by linux driver)

0122-07-27 22:57:26 FFA1A2C0 [AMFDecoderUVDImpl] Debug: AMFDecoderUVDImpl::Init(P010, 3840, 2160)
[A] 00122-07-27 22:57:26 FFA1A2C0 [AMFVideoStreamParserImpl] Debug: AMFVideoStreamParserImpl::Init(P010, 3840, 2160)
[A] 00122-07-27 22:57:26 FFA1A2C0 [AMFVideoStreamParserImpl] Debug: AMFVideoStreamParserImpl::Terminate()
[A] 00122-07-27 22:57:26 FFA1A2C0 [AMFDecodeEngineImplVulkan] Error: ../../../../../runtime/src/components/DecoderUVD/DecodeEngines/Vulkan/DecodeEngineVulkan.cpp(121):InitDecoder() Codec is not supported by HW
[A] 0Failed to init decoder: AMF_FAIL

HEVC 8bit input

0122-07-27 23:11:45 B1A2F2C0 [AMFDecoderUVDImpl] Debug: AMFDecoderUVDImpl::Init(NV12, 1920, 1080)
[A] 00122-07-27 23:11:45 B1A2F2C0 [AMFVideoStreamParserImpl] Debug: AMFVideoStreamParserImpl::Init(NV12, 1920, 1080)
[A] 00122-07-27 23:11:45 B1A2F2C0 [AMFVideoStreamParserImpl] Debug: AMFVideoStreamParserImpl::Terminate()
[A] 00122-07-27 23:11:45 B1A2F2C0 [AMFDecodeEngineImplVulkan] Info: InitDecoder() OK! Video Vulkan HW DECODER (1920x1080) for input stream
[A] 0Initialized decoder

So far with vaapi and current mesa the AMD HW decoder (vcn_dec) is in better shape than AMD's own AMF implementation on linux.

[bavdevc]

btw. could someone with a discrete graphics test that linux-hevc-10bit decoder, please? If it's the same for the GPUs as for the APUs, I would open an issue at AMD AMF component.

I'm not sure if the error/missing implementation is only for the xnacks(APU) or all GPUs when using linux.

[bavdevc]

Hello @rigaya - I opened an issue at AMD/AMF with all the bugs/missing features - it's number 348 in GPUOpen-LibrariesAndSDKs/AMF

Do you want me to close this vceenc issue or do you want to keep it open for the AMFVideoDecoderHW_H265_MAIN10 change in --check-features option?

[rigaya]

Thank you for the issue in AMF SDK.

Please keep this issue open till I change AMFVideoDecoderHW_H265_MAIN10 in --check-features, which will be changed in next release.

[rigaya]

VCEEnc 7.09 will fix AMFVideoDecoderHW_H265_MAIN10 detection in --check-features.

[bavdevc]

fixed in VCEEnc, AMD still working on their issue