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• FFmpeg errors while hardware decoding video c++

  5 mai 2021, par AdamFull

  I am trying to figure out hardware decoding in ffmpeg in c ++. I get about the same errors on any api.
Here is the initialization code :

  


  
    AVHWDeviceType devType = av_hwdevice_find_type_by_name(HW_DECODER_NAME);

    for (int i = 0;; i++)
    {
        const AVCodecHWConfig *config = avcodec_get_hw_config(av_codec, i);
        if (!config)
        {
            fprintf(stderr, "Decoder %s does not support device type %s.\n",
                    av_codec->name, av_hwdevice_get_type_name(devType));
            return false;
        }

        if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX && config->device_type == devType)
        {
            hw_pix_fmt = config->pix_fmt;
            break;
        }
    }

    hw_device_ctx = av_hwdevice_ctx_alloc(devType);

    *av_codec_ctx = avcodec_alloc_context3(av_codec);
    if (!av_codec_ctx)
    {
        printf("Couldn't create AVCodecContext\n");
        return false;
    }

    if (avcodec_parameters_to_context(*av_codec_ctx, av_codec_params) < 0)
    {
        printf("Couldn't initialize AVCodecContext\n");
        return false;
    }

    (*av_codec_ctx)->get_format  = get_hw_format;

    //Initialize hardware context
    int err = 0;
    if ((err = av_hwdevice_ctx_create(&hw_device_ctx, devType, NULL, NULL, 0)) < 0)
    {
        fprintf(stderr, "Failed to create specified HW device.\n");
        return false;
    }

    (*av_codec_ctx)->hw_device_ctx = av_buffer_ref(hw_device_ctx);

    if (avcodec_open2(*av_codec_ctx, av_codec, NULL) < 0)
    {
        printf("Couldn't open codec\n");
        return false;
    }

    b_is_initialized = true;



  


  Here is the decoder code :

  


  int response;

    response = avcodec_send_packet(av_codec_ctx, av_packet);
    if (response < 0)
    {
        printf("Couldn't send video frame to decoder.\n");
        print_error(response);
        return false;
    }

    realloc_frame(&av_frame);

    response = avcodec_receive_frame(av_codec_ctx, av_frame);
    if (response == AVERROR(EAGAIN) || response == AVERROR_EOF)
    {
        av_frame_free(&av_frame);
        return false;
    }
    else if (response < 0)
    {
        print_error(response);
        return false;
    }

    if(hwdecoder.is_initialized())
    {
        if(!hwdecoder.decode(av_packet, &av_frame))
        {
            printf("Failed while decoding frame on gpu.\n");
        }
    }

    pts = av_frame->pts;

    // Set up sws scaler
    if (!sws_scaler_ctx)
    {
        auto source_pix_fmt = correct_for_deprecated_pixel_format((AVPixelFormat)av_frame->format);
        //Send here frame params
        sws_scaler_ctx = sws_getContext(width, height, source_pix_fmt,
                                        width, height, AV_PIX_FMT_RGB0,
                                        SWS_BICUBIC, NULL, NULL, NULL);


  


  Decoding on the processor works without problems, but when I decode on the gpu, it turns out to decode some part of the video and then during avcodec_send_packet I get the Invalid data found when processing the input error. Help please, I have been suffering for the second week.

  


  EDIT

  


  OP forgot about hwdecoder.decode method.

  


  int ret = 0; 
realloc_frame(&sw_frame);      
if ((*av_frame)->format == hw_pix_fmt)
{         
  if ((ret = av_hwframe_transfer_data(sw_frame, *av_frame, 0)) < 0)          
  {             
     fprintf(stderr, "Error transferring the data to system memory\n");               
     av_frame_free(&sw_frame);             
     return false;         
  } 
} 


  


  Error log :

  


  Couldn't send video frame to decoder.
Invalid data found when processing input
[AVHWFramesContext @ 000001E44F6EC8C0] Static surface pool size exceeded.
[h264 @ 000001E445D60940] get_buffer() failed
[h264 @ 000001E445D60940] thread_get_buffer() failed
[h264 @ 000001E445D60940] decode_slice_header error
[h264 @ 000001E445D60940] no frame!


  


  My code based on this example : https://ffmpeg.org/doxygen/4.0/hw_decode_8c-example.html

  


  On windows i used dxva2 device, configure project with cmake 3.9, and build with MSVC amd64.
On linux i used vdpau device, compiled from source ffmpeg libs, project was configured with cmake 3.9 and build with gcc 10

  


  UPDATE

  


  This code working well with cuda, but with another api's i still have problems.

  


• Why this mp4 video file can not play on ios and macos device ?

  12 janvier 2020, par Wang Xiao

  It can play on android device.
  But only can’t play iOS devices.
  This is ffprobe read that video file info :

  

• Discord api, bot play audio but i can't hear it

  5 novembre 2023, par BigMautone

  Just for fun, i'm trying to make a discord bot with python to play music from youtube. I've implemented some basic function and the bot seems to work fine,except that, once I enter the voice channel, the icon lights up and seems to play audio but I can't hear it.

  


  This is the code that I'm calling from the discord command :

  


    @commands.command(name='play')
    async def play(self, ctx, link):
        try:
            await ctx.invoke(self.connect)
            server = ctx.message.guild
            voice_channel = server.voice_client

            async with ctx.typing():
                link_info = await YTManager.yt_search(link)
                filename = link_info['filename']
                stream = link_info['stream_url']
                try:
                    voice_channel.play(discord.FFmpegPCMAudio(source=stream, **ffmpeg_settings))
                    voice_channel.source.volume = 1
                except Exception as e:
                    pprint(f"error: {e}")

            await ctx.send('**Now playing:** {}'.format(filename))
        except:
            await ctx.send("The bot is not connected to a voice channel.")


  


  Ffmpeg is ok, i've added the bin folder to path and I don't get any error in the console.
What could be the problem ?