Sur d’autres sites (11949)

• wrong play audio sasamples

  7 août 2014, par Ivan Lisovich

  I have a problem with a ffmpeg and NAudio libs.
  I worked with the old ffmpeg library and there the audio plays correctly.
  read video in manage c++

  // Read frames and save to list audio frames
  
  while(av_read_frame(pFormatCtx, &packet) >= 0) 
  
  {
  
      if(packet.stream_index == videoStream) 
  
      {
  
          // reade image
  
      }
  
      else if(packet.stream_index == audioStream) 
  
      {
  
          int b = av_dup_packet(&packet);
  
          if(b >= 0) {
  
              int audio_pkt_size = packet.size;
  
              libffmpeg::uint8_t* audio_pkt_data = packet.data;
  
              while(audio_pkt_size > 0) 
  
              {
  
                  int got_frame = 0;
  
                  int len1 = libffmpeg::avcodec_decode_audio4(aCodecCtx, &frame, &got_frame, &packet);
  
                  if(len1 < 0)
  
                  {
  
                      /* if error, skip frame */
  
                      audio_pkt_size = 0;
  
                      break;
  
                  }
  
                  audio_pkt_data += len1;
  
                  audio_pkt_size -= len1;
  
                  if (got_frame)
  
                  {
  
                      int data_size = libffmpeg::av_samples_get_buffer_size ( NULL, aCodecCtx->channels, frame.nb_samples, aCodecCtx->sample_fmt, 1 );
  
                      array<byte>^ managedBuf = gcnew array<byte>(data_size);
  
                      System::IntPtr iptr = System::IntPtr( frame.data[0] );
  
                      System::Runtime::InteropServices::Marshal::Copy( iptr, managedBuf, 0, data_size );
  
                      audioData->Add(managedBuf);
  
                  }
  
              }
  
          }
  
      }
  
      // Free the packet that was allocated by av_read_frame
  
      libffmpeg::av_free_packet(&amp;packet);
  
  }
  
  </byte></byte>

  I return audioData to c# code and play in NAudio library
  play in c#

  var recordingFormat = new WaveFormat(reader.SampleRate, 16, reader.Channels);
  
  var waveProvider = new BufferedWaveProvider(recordingFormat) { DiscardOnBufferOverflow = true, BufferDuration = TimeSpan.FromMilliseconds(10000) };
  
  var waveOut = new DirectSoundOut();
  
  waveOut.Init(waveProvider);
  
  waveOut.Play();
  
  foreach (byte[] data in audioData)
  
  {
  
      waveProvider.AddSamples(data, 0, data.Length);
  
  }

  but audio not playing.
  what am I doing wrong ?

• I can’t play HEVC encoded Flv format video files with ffplay

  25 décembre 2023, par 1337zzz

  I could not decode a video file

  


  I have a video file in FLV format. Someone told me that the encoding format of this video is HEVC, so I tried to play this video with ffplay. But I found that native ffplay cannot play HEVC encoded files in flv format, so I found relevant information to decode HEVC encoded files in FLV format, but this file still cannot be played.

  


  The following is the error message, the content is that the NAL part of the analysis failed

  


  [hevc @ 0x7fba4800fc00] Invalid NAL unit size in extradata.
[flv @ 0x7fba4800f000] Could not find codec parameters for stream 0 (Video: hevc, none, 5494 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options



  


  I tried to use ffplay to play other HEVC encoded videos in FLV format, and the result was no problem. So I use a hexadecimal editor to view the file that cannot be played normally. Below is the data of the first frame of video.

  


  000003a0: xx xx xx xx xx xx xx 09 00 00 4E 00 00 00 00 00    ..........N.....
000003b0: 00 00 1E 00 00 00 00 01 00 00 00 FF E2 00 17 40    ............b..@
000003c0: 01 0C 01 FF FF 01 00 01 00 00 B0 00 00 03 00 00    ..........0.....
000003d0: 03 00 96 1D 94 09 00 1E 42 01 01 01 00 01 00 00    ........B.......
000003e0: B0 00 00 03 00 00 03 00 96 A0 01 E0 20 02 1C 5A    0..........`...Z
000003f0: 1D 96 49 0A 40 A2 01 00 07 44 01 C0 13 18 21 20    ..I.@"...D.@..!.


  


  We can see that 09 represents the video type, 4E represents the length of TAG data, and 1C represents the key frame of HEVC, but I can’t judge whether the following data is HEVC encoded data, so I suspect that the latter data may not be encoded by HEVC.

  


  Question

  


  Is there any way to detect the encoding format of the video based on the hexadecimal data, or who can tell me which video encoding format the following data is ?

  


  Thank you very much !

  


• Not able to play video file in Qt5 based Web browser on Linux ARM machine

  20 février 2016, par user3436349

  I am using Yocto Buildsystem to generate customized Linux Image with Qt5.4
  support in it for TI AM335x based ARM platform, here in Yocto I have selected
  components those are required for Qt5 based Webbrowser so as to play HTML5 audio
  and video files such as :
   qtmultimedia
   gstreamer (1.0)
   qtscript
   qtwebsockets
   qtimageformats
   libgles-omap3
   lighttpd
   gst-ffmpeg
   gst-fluendo-mp3
   gstreamer (0.10)

  Here after building the final image. I found that there are
  both gstreamer and gstreamer-1.0 directories in /usr/lib, also the
  required ffmpeg libs are located in /usr/lib/gstreamer directory.
  But I suspect the webkit by default links to /usr/lib/gstreamer-1.0
  directory and hence cannot find required libs.

  When I tried the manually copy the ffmepg related libs in /usr/lib/gstreamer-1.0
  directory from /usr/lib/gstreamer, then I got the libav related version error.

  Please guide me regarding who to configure webkit or webcore .bb file so that
  it links to both the gstreamer directories in /usr/lib and can thus play
  HTML5 audio and video files in qt5 based web-browser.