FFmpeg硬件解码器初始化失败如何处理

Question

我在项目中使用 FFmpeg.AutoGen 库，发现使用硬件解码的 video 发生崩溃。 所以我回到示例并在那里进行了测试，发现了相同的结果。

示例报告以下内容

Current directory: D:\...\Ruslan-B\FFmpeg.AutoGen\FFmpeg.AutoGen.Example\bin\Debug\net6.0
Running in 64-bit mode.
FFmpeg binaries found in: D:\...\Ruslan-B\FFmpeg.AutoGen\FFmpeg\bin\x64
FFmpeg version info: 5.0-full_build-www.gyan.dev
Use hardware acceleration for decoding?[n]
y
Select hardware decoder:
1. AV_HWDEVICE_TYPE_CUDA
2. AV_HWDEVICE_TYPE_DXVA2
3. AV_HWDEVICE_TYPE_QSV
4. AV_HWDEVICE_TYPE_D3D11VA
5. AV_HWDEVICE_TYPE_OPENCL
6. AV_HWDEVICE_TYPE_VULKAN
Selected [2]

Decoding...
[mpegts @ 0000012917fced00] parser not found for codec klv, packets or times may be invalid.
[h264 @ 000001293b424080] Reinit context to 1920x1088, pix_fmt: yuv420p
[mpegts @ 0000012917fced00] parser not found for codec klv, packets or times may be invalid.
[AVHWDeviceContext @ 000001293b9a6940] Using D3D9Ex device.
codec name: h264
[h264 @ 000001293b8a5040] Decoder GUIDs reported as supported:
[h264 @ 000001293b8a5040] {ee27417f-5e28-4e65-beea-1d26b508adc9}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {bf22ad00-03ea-4690-8077-473346209b7e}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {e07ec519-e651-4cd6-ac84-1370cceec851}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {bcc5db6d-a2b6-4af0-ace4-adb1f787bc89}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {1b81bea4-a0c7-11d3-b984-00c04f2e73c5}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {1b81be68-a0c7-11d3-b984-00c04f2e73c5}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {d79be8da-0cf1-4c81-b82a-69a4e236f43d}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {f9aaccbb-c2b6-4cfc-8779-5707b1760552}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {705b9d82-76cf-49d6-b7e6-ac8872db013c}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {c528916c-c0af-4645-8cb2-372b6d4adc2a}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {07cfaffb-5a2e-4b99-b62a-e4ca53b6d5aa}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {91cd2d6e-897b-4fa1-b0d7-51dc88010e0a}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {90b899ea-3a62-4705-88b3-8df04b2744e7}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {442b942a-b4d9-4940-bc45-a882e5f919f3}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {8c56eb1e-2b47-466f-8d33-7dbcd63f3df2}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {5b11d51b-2f4c-4452-bcc3-09f2a1160cc0}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {75fc75f7-c589-4a07-a25b-72e03b0383b3}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]  1[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {107af0e0-ef1a-4d19-aba8-67a163073d13}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]  1[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {463707f8-a1d0-4585-876d-83aa6d60b89e}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {a4c749ef-6ecf-48aa-8448-50a7a1165ff7}[h264 @ 000001293b8a5040]  1[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {76988a52-df13-419a-8e64-ffcf4a336cf5}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {80a3a7bd-89d8-4497-a2b8-2126af7e6eb8}[h264 @ 000001293b8a5040]  1[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {a74ccae2-f466-45ae-86f5-ab8be8af8483}[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {1b81be94-a0c7-11d3-b984-00c04f2e73c5}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {1b81bea2-a0c7-11d3-b984-00c04f2e73c5}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] {49761bec-4b63-4349-a5ff-87ffdf088466}[h264 @ 000001293b8a5040]  0[h264 @ 000001293b8a5040]
[h264 @ 000001293b8a5040] No decoder device for codec found
[h264 @ 000001293b8a5040] Failed setup for format dxva2_vld: hwaccel initialisation returned error.
[h264 @ 000001293b8a5040] Reinit context to 1920x1088, pix_fmt: yuv420p
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at FFmpeg.AutoGen.ffmpeg+<>c.<.cctor>b__7_466(FFmpeg.AutoGen.AVFrame*, FFmpeg.AutoGen.AVFrame*, Int32)
   at FFmpeg.AutoGen.ffmpeg.av_hwframe_transfer_data(FFmpeg.AutoGen.AVFrame*, FFmpeg.AutoGen.AVFrame*, Int32)
   at FFmpeg.AutoGen.Example.VideoStreamDecoder.TryDecodeNextFrame(FFmpeg.AutoGen.AVFrame ByRef)
   at FFmpeg.AutoGen.Example.Program.DecodeAllFramesToImages(FFmpeg.AutoGen.AVHWDeviceType)
   at FFmpeg.AutoGen.Example.Program.Main(System.String[])

错误/消息

...
[h264 @ 0000013533bfb040] No decoder device for codec found
[h264 @ 0000013533bfb040] Failed setup for format dxva2_vld: hwaccel initialisation returned error.
[h264 @ 0000013533bfb040] Reinit context to 1920x1088, pix_fmt: yuv420p

在通话中报告给

error = ffmpeg.avcodec_receive_frame(_pCodecContext, _pFrame);

ffmpeg.avcodec_receive_frame的结果（错误）是0。所以没有明显的错误。 但这些消息显然表明硬件解码器无法处理视频。

调用

ffmpeg.av_hwframe_transfer_data()

时抛出异常

if (_pCodecContext->hw_device_ctx != null)
{
    ffmpeg.av_hwframe_transfer_data(_receivedFrame, _pFrame, 0).ThrowExceptionIfError();
    frame = *_receivedFrame;
}

我的问题是我怎样才能事先确定这一点而不使用硬件解码器？即回退到软件解码器。

编辑： 我发现对于 Truck.ts 视频，在调用

_pCodecContext->hwaccel

后，

ffmpeg.avcodec_receive_frame(_pCodecContext, _pFrame);

为空，但对于硬件解码器正在工作的视频，

_pCodecContext->hwaccel

为非空。

将代码更新为

if (_pCodecContext->hw_device_ctx != null && _pCodecContext->hwaccel != null)
{
    ffmpeg.av_hwframe_transfer_data(_receivedFrame, _pFrame, 0).ThrowExceptionIfError();
    frame = *_receivedFrame;
}

似乎足以捕获错误。 检查硬件解码器是否工作的正确方法是正确的方法还是有更好的方法？

Answer 1

您必须检查

_pFrame->hw_frames_ctx

不为空。
如果硬件失败，框架中的

hw_frames_ctx

将为空