[Libav-user] Failed to execute when using hardware decoding on some computers

[Cyril Drouet]

Hi,

I'm not sure if the email I sent a couple days ago was approved and sent to
everyone. If it is the case, note that I have resolved my problem.
Information can be found here:
http://stackoverflow.com/questions/34602561/failed-to-execute-0x80070057-when-decoding-video-via-ffmpeg-with-dxva2

Thanks,
Cyril

On Tue, Jan 5, 2016 at 3:16 PM, Cyril Drouet <cyril.drouet at gmail.com> wrote:

> I have successfully implemented a video player using ffmpeg. I am now
> trying to use hardware decoding but I'm facing a couple issues. I found a
> post that I followed as a starting point here:
> http://comments.gmane.org/gmane.comp.video.ffmpeg.libav.user/13523
>
> I have updated the code that setup the necessary stuff for the decoder.
> The updated code is available here:
> https://drive.google.com/file/d/0B5ufHdoDzA4ieVk5UVpxcDNzRHc/view?usp=sharing
>
> And this is how I'm using it to initialize the decoder:
>
> // Prepare the decoding context
> AVCodec *codec = nullptr;
> _codecContext = _avFormatContext->streams[_streamIndex]->codec;
> if ((codec = avcodec_find_decoder(_codecContext->codec_id)) == 0)
> {
>     std::cout << "Unsupported video codec!" << std::endl;
>     return false;
> }
>
> _codecContext->thread_count = 1;  // Multithreading is apparently not compatible with hardware decoding
> InputStream *ist = new InputStream();
> ist->hwaccel_id = HWACCEL_AUTO;
> ist->hwaccel_device = "dxva2";
> ist->dec = codec;
> ist->dec_ctx = _codecContext;
> _codecContext->coded_width = _width;
> _codecContext->coded_height = _height;
>
> _codecContext->opaque = ist;
> dxva2_init(_codecContext);
>
> _codecContext->get_buffer2 = ist->hwaccel_get_buffer;
> _codecContext->get_format = GetHwFormat;
> _codecContext->thread_safe_callbacks = 1;
>
> if (avcodec_open2(_codecContext, codec, nullptr) < 0)
> {
>     std::cout << "Video codec open error" << std::endl;
>     return false;
> }
>
> And here is the definition of GetHwFormat referenced above:
>
> AVPixelFormat GetHwFormat(AVCodecContext *s, const AVPixelFormat *pix_fmts)
> {
>     InputStream* ist = (InputStream*)s->opaque;
>     ist->active_hwaccel_id = HWACCEL_DXVA2;
>     ist->hwaccel_pix_fmt = AV_PIX_FMT_DXVA2_VLD;
>     return ist->hwaccel_pix_fmt;
> }
>
> When I open an mp4 (encoded in h264) video that is HD resolution or less,
> everything seems to be working fine. However, as soon as I try higher
> resolution videos like 3840x2160, I get the following errors repeatedly:
>
> Failed to execute: 0x80070057
> Hardware accelerator failed to decode picture
>
> I also start getting the following errors after a few seconds:
>
> co located POCs unavailable
>
> And the video is not displayed properly: I get a lot of artifacts all over
> the video and it is lagging. I checked the first error in the ffmpeg source
> code. It seems that IDirectXVideoDecoder_Execute fails because of an
> invalid parameter. Since this is happening withing ffmpeg, there must be
> something that I'm missing but I can't figure out what. The only relevant
> post that I found with this error was because of multithreading but I set
> the thread_count to 1 before opening the codec.
>
> This issue is happening on my main computer which has the following specs:
>
>    - i7-4790 CPU @ 3.6GHz
>    - RAM 16 GB
>    - Intel HD Graphics 4600
>    - Windows 8.1
>
> The same issue is not happening on my second computer which has the
> following specs:
>
>    - i7 4510U @ 2GHz
>    - RAM 8 GB
>    - NVIDIA GeForce GTX 750Ti
>    - Windows 10
>
> If I use DXVAChecker on my main computer, it says that my graphics card
> supports DXVA2 for H264_VLD_*, and I can see that the calls to the
> Microsoft API are being made (DXVA2_DecodeDeviceCreated,
> DXVA2_DecodeDeviceBeginFrame, DXVA2_DecodeDeviceGetBuffer,
> DXVA2_DecodeDeviceExecute, DXVA2_DecodeDeviceEndFrame) while my video is
> playing.
>
> I also tested on a Surface Pro 3 with an i5 4300U @ 1.9GHz (4 CPUs), 8 GB
> of RAM, Intel HD Graphics 4400, Windows 10, and the video looks good. There
> are no error messages.CPU usage is 40% less than without hardware decoding
> like the second computer mentioned above.GPU is only 1% or maybe 2% more
> (same as for the other 2 computers mentioned above) while testing the same
> video at 3840x2160
>
> Note that I tried both the Windows release available on the FFmpeg
> website, and a version that I compiled with --enable-dxva2. I have searched
> a lot already but I was unable to find what I'm doing wrong.
>
> Hopefully, someone can help me, or maybe point me to a better example?
>
>
> Thanks!
>
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