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• Fill a BGR Frame Data in FFMPEG

  23 février 2016, par mFeinstein

  I am following the FFmpeg video enconding example here, but it makes some dummy YUV420P frames and I have a BGR image already captured from a camera.

  I am not sure how to use frame->data[] and frame->linesize[] for filling them with my BGR image instead, so I can encode an H264 video.

  ---

  EDIT :

  I have the following code (it’s called for every new picture the camera sends) after Ronald’s answer :

      .............
  
      AVFrame *bgrFrame = av_frame_alloc();
  
  
  
      bgrFrame->width = originalBGRImage.cols;
  
      bgrFrame->height = originalBGRImage.rows;
  
  
  
      ret = av_image_alloc(bgrFrame->data, bgrFrame->linesize, bgrFrame->width, bgrFrame->height, AV_PIX_FMT_BGR24, 32);
  
  
  
      /////////////////////////////////////
  
      // This works and prevents memory leak....if I remove it, it consumes all the RAM....but I can't free this memory here, since I will use it later...
  
      av_freep(&bgrFrame->data[0]);
  
      av_frame_free(&bgrFrame);
  
      return;
  
      /////////////////////////////////////
  
  
  
      ret = av_image_fill_pointers(bgrFrame->data, AV_PIX_FMT_BGR24, bgrFrame->height, originalBGRImage.data, bgrFrame->linesize);
  
  
  
      /////////////////////////////////////
  
      // Here is where I am done using the memory so I will want to free it...but this same code crashes the program.
  
      av_freep(&bgrFrame->data[0]);
  
      av_frame_free(&bgrFrame);
  
      return;
  
      /////////////////////////////////////

  So if I remove the av_freep(&bgrFrame->data[0]); at the end of the code I will have a memory leak...but leaving it there crashes....so what’s the correct way to free the used memory ?

• How to fill AVFrame with audio data

  12 décembre 2014, par Andy

  I use Win32 API to implement a desktop recording program.
  The video capture feature works, but I have no idea to put the audio in the FFmpeg encoder’s data structure.

  The below code will get the data of the default output audio.

  // Set wave format when sampling the audio
  
  WAVEFORMATEX wf; 
  
  wf->wFormatTag = WAVE_FORMAT_PCM;
  
  wf->nChannels = 1;
  
  wf->nSamplesPerSec = 12000;
  
  wf->nBlockAlign = 1;
  
  wf->wBitsPerSample = 8;
  
  wf->cbSize = 0;
  
  wf->nAvgBytesPerSec = nChannels * nSamplesPerSec * wBitsPerSample / 8;
  
  
  
  // Open wave input channel
  
  HWAVEIN hWaveIn;
  
  OpenWaveIn(&hWaveIn,&wf);
  
  
  
  // Prepare Wave In Header and allocate memory
  
  WAVEHDR waveHdr;
  
  DWORD dataSize = 240000L;
  
   PrepareWaveIn(&hWaveIn, &waveHdr, dataSize);
  
  
  
  // Start recording
  
  StartRecord(&hWaveIn);
  
  
  
  // Stop recording
  
  MMTIME mmt;
  
  StopRecord(&hWaveIn, &mmt);

  waveHdr->lpData is a pointer to locked data buffer.

  The question is how can I implement the below function let the waveHdr->->lpData can be saved to AVFrame ?

  static AVFrame *get_audio_frame(OutputStream *ost)
  
  {
  
      AVFrame *frame = ost->tmp_frame;
  
      int j, i, v;
  
      int16_t *q = (int16_t*)frame->data[0];
  
      AVRational arg;
  
      arg.num = 1;
  
      arg.den = 1;
  
  
  
      //the transform code should be put here
  
  
  
      frame->pts = ost->next_pts;
  
      ost->next_pts += frame->nb_samples;
  
      return frame;
  
  }

  Does someone know how can implement this ?

• avfilter/vsrc_testsrc : also fill alpha planes with a test pattern in {rgb,yuv}testsrc

  31 mars, par James Almer

  avfilter/vsrc_testsrc : also fill alpha planes with a test pattern in rgb,yuvtestsrc
  And add support for more formats.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavfilter/vsrc_testsrc.c
  • [DH] tests/ref/fate/filter-rgbtestsrc-rgba
  • [DH] tests/ref/fate/filter-yuvtestsrc-ayuv
  • [DH] tests/ref/fate/filter-yuvtestsrc-ayuv64
  • [DH] tests/ref/fate/filter-yuvtestsrc-vuya