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• Recursively converting all files in folder using FFMpeg and placing them in different output folder

  10 janvier 2020, par Cecila Tarjon

  I want to remux some videos to MP4 so that I can play them on my Roku as well as my Plex. I have reviewed the approaches suggested in the answers to the questions
  How would I write a batch file to run an ffmpeg command on an entire directory ? and How do you convert an entire directory with ffmpeg ?, but this doesn’t quite solve my problem.

  I am currently using the command prompt to navigate to the directory in question and then running the command line :

  for %i in (*.mkv) do c:\ffmpeg\bin\ffmpeg -i "%i" -c copy -map 0 %userprofile%\documents\Plex\mp4\%~ni.mp4"

  I would like to be able to run this from a higher level (i.e., %userprofiles%\Documents\Plex\MKV instead of ...\mkv\show\season) and have it run on all subfolders.

  I would also ideally like for it to output to the mp4\show\season level for the same place it gets them from.

  How can I accomplish this ?

  Once I know it will work in a regular command window, I will be converting it to a batch file so I can run as needed.

• Can someone please explain to me why is this happening

  17 juillet 2015, par user2270995

  I am trying to show the frame decoded in FFMPEG in a UIImageView.The method given below stepFrame is called at the interval of 1/30 second. The setImage method does the conversion for the frame and sets the image for ImageView.

  Now if i call setImage inside stepFrame after frame has finished decoding the image doesn’t show in the ImageView. But if i call setImage after calling stepFrame the image shows fine in ImageView.

  - (BOOL)stepFrame
  
  {
  
   // AVPacket packet;
  
   int frameFinished=0;
  
  
  
   while (!frameFinished && av_read_frame(pFormatCtx, &packet) >=0 )
  
   {
  
      // Is this a packet from the video stream?
  
      if(packet.stream_index==videoStream) 
  
      {
  
          // Decode video frame
  
          avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
      }
  
  
  
      if (frameFinished) // this block of code if my source of confusion
  
      {
  
          [self setImage]; 
  
      }
  
  
  
      if (packet.stream_index==audioStream) 
  
      {
  
          // NSLog(@"audio stream");
  
          // audio stuff
  
      }
  
   } 
  
    return frameFinished!=0;
  
  }
  
  
  
  
  
  -(void)setImage
  
  {
  
    if (!pFrame->data[0])
  
       return;
  
    [self convertFrameToRGB]; // uses sws_scale to write the converted frame to picture
  
    imageview.image = [self imageFromAVPicture:picture width:outputWidth height:outputHeight];
  
  }

• avformat/ivfenc : Set the "number of frames" in IVF header

  3 juillet 2023, par Dai, Jianhui J

  avformat/ivfenc : Set the "number of frames" in IVF header
  Should set "number of frames" to bytes 24-27 of IVF header, not
  
  duration.
  
  It is described by [1], and confirmed by parsing all IVF files in [2].
  This commit also updates the md5sum of refs to pass fate-cbs.
  [1] Duck IVF - MultimediaWiki
  
  https://wiki.multimedia.cx/index.php/Duck_IVF
  [2] webm/vp8-test-vectors
  
  https://chromium.googlesource.com/webm/vp8-test-vectors
  Signed-off-by : Jianhui Dai <jianhui.j.dai@intel.com>
  
  Signed-off-by : Ronald S. Bultje <rsbultje@gmail.com>
  

  • [DH] libavformat/ivfdec.c
  • [DH] libavformat/ivfenc.c
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-03-deltaq
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-06-bilinear
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-09-lf_deltas
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-10-show-existing-frame
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-10-show-existing-frame2
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-segmentation-aq-akiyo
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-segmentation-sf-akiyo
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-tiling-pedestrian
  • [DH] tests/ref/fate/cbs-vp9-vp91-2-04-yuv440
  • [DH] tests/ref/fate/cbs-vp9-vp91-2-04-yuv444
  • [DH] tests/ref/fate/cbs-vp9-vp92-2-20-10bit-yuv420
  • [DH] tests/ref/fate/cbs-vp9-vp93-2-20-10bit-yuv422
  • [DH] tests/ref/fate/cbs-vp9-vp93-2-20-12bit-yuv444