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• Modify video frames with Facebook data

  9 novembre 2014, par s kumari

  Can anyone suggest how to build web app like http://www1.lost-in-val-sinestra.com/ without flash. We want to pull the data from facebook and using pulled data edit the sample video and play in the browser. I was thinking to use php with ffmpeg to edit the video but unable to do it successfully. Can anyone suggest me better library/technology stack through which I should be able edit video and update few frames with our customized facebook data(text and images) ?

  Thanks a lot in advance

• 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 packet encoded AAC data to flv file with ffmpeg API ?

  1er juillet 2015, par Jerikc XIONG

  I have captured the Audio data from Android Microphone and encoded them by MediaCodec.

  My question is :

  How to packet encoded AAC data to flv with ffmpeg ?