How to use AMD AV1 hardware encoder with `MediaTranscoder`?

Question

I am using MediaTranscoder with GraphicsCaptureItem to capture screen and record to a compressed video file.

I have Radeon 860M (built into Ryzen AI 7 350), that supports hardware encoding of H.264 and AV1. Both hardware codecs are listed when I call

var codecQuery = new CodecQuery();
var videoEncoders = await codecQuery
    .FindAllAsync(CodecKind.Video, CodecCategory.Encoder, "");

Specifically, I get AMDav1Encoder with subtype {31305641-0000-0010-8000-00AA00389B71}.

So I create a MediaEncodingProfile like this:

var encodingProfile = MediaEncodingProfile.CreateAv1(VideoEncodingQuality.Auto);
encodingProfile.Video = VideoEncodingProperties.CreateAv1();
encodingProfile.Video.Bitrate = 10_000_000;
encodingProfile.Video.FrameRate.Numerator = 20;
encodingProfile.Video.FrameRate.Denominator = 1;
encodingProfile.Video.PixelAspectRatio.Numerator = 1;
encodingProfile.Video.PixelAspectRatio.Denominator = 1;
encodingProfile.Video.ProfileId = 0;
// Describe audio input
encodingProfile.Audio = MediaEncodingProfile.CreateM4a(AudioEncodingQuality.Low).Audio;
encodingProfile.Audio.SampleRate = 48000;

await _transcoder.PrepareMediaStreamSourceTranscodeAsync(_mediaStreamSource, destination, encodingProfile);

This last call fails with COMException 0xC00DA412, which seems to map to MF_E_TRANSCODE_NO_MATCHING_ENCODER, which seems to indicate transcoder is unable to find AV1 encoder. Just to be clear _transcoder.HardwareAccelerationEnabled is set to true.

What I tried so far:

Using H.264: replacing both CreateAv1 with CreateMp4 and CreateH264 works, but the it does not use AV1.
Setting ProfileId to 0 (default value was 1, and it produced the same error) - same error.
When creating source from the screen, pretend that it is actually NV12 (which was Bgra8). I thought maybe encoder only supports NV12 input. However, this still failed with MF_E_TRANSCODE_NO_MATCHING_ENCODER.

This is what I get when I inspect the encodingProfile.Video.Properties:

{23e5cad8-a3fc-4f0f-97c3-dff51d03bc92} - 1 (uint)
{c6376a1e-8d0a-4027-be45-6d9a0ad39bb6} - 4294967297 (ulong)
{48eba18e-f8c9-4687-bf11-0a74c9f96a8f} - {73646976-0000-0010-8000-00aa00389b71} (System.Guid)
{c459a2e8-3d2c-4e44-b132-fee5156c7bb0} - 42949672961 (ulong)
{20332624-fb0d-4d9e-bd0d-cbf6786c102e} - 10000000 (uint)
{1652c33d-d6b2-4012-b834-72030849a37d} - 16492674418800 (ulong)
{f7e34c9a-42e8-4714-b74b-cb29d72c35e5} - {31305641-0000-0010-8000-00aa00389b71} (this is the AV1 subtype)
{ad76a80b-2d5c-4e0b-b375-64e520137036} - 1 (uint, this is the profile)

Trying HEVC (by replacing CreateAv1 with CreateHEVC) also fails, but with 0xC00D6D60 MF_E_TRANSFORM_TYPE_NOT_SET which does not seem directly related, but suspicious because exact same HEVC code works on a machine with Nvidia GPU.

I would try to remove all the settings you change to encodingProfile.Video, start just from CreateAV1 and CreateM4a(AudioEncodingQuality.Auto), see if it works, and then change what property you need, one by one. — Simon Mourier
– Simon Mourier, Commented Jun 8 at 6:44

LOST · Accepted Answer · 2025-06-09 20:21:42Z

-1

What actually worked was skipping this line:

var encodingProfile = MediaEncodingProfile.CreateAv1(VideoEncodingQuality.Auto);
encodingProfile.Video = VideoEncodingProperties.CreateAv1(); // <- skip this
encodingProfile.Video.Bitrate = 10_000_000;

I believe the issue is that when you create VideoEncodingProperties explicitly you have to manually set all the required settings otherwise configured by MediaEncodingProfile.CreateAv1, and I've been missing some.

answered Jun 9 at 20:21

LOST

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