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• FFMPEG x264 encoding on Android - error with lookahead

  6 janvier 2013, par Tishu

  I am using FFMPEG + x264 on Android to encode YUV420 frames to a video file. I use the following code on each frame to encode them :

  avcodec_encode_video2(gVideoWriteCodecCtx, &packet, pCurrentFrame, &gotPacket);

  On the first few calls, the frame buffer gets filled and nothing is encoded. When the first encoding happens, a call is made to x264_lookahead_get_frames. I can see there that my frame array is correctly populated, but the first item is NULL. As a consequence, in x264_weights_analyse the reference frame gotten as frames[p0] is NULL and I get an exception there.

  slicetype.c, the first frame in "frames" is NULL

  if( h->param.analyse.i_weighted_pred && b == p1 )
  
      {
  
          x264_emms();
  
          x264_weights_analyse( h, fenc, frames[p0], 1 );
  
          w = fenc->weight[0];
  
      }

  And the exception happens there, ref is NULL

  static void x264_weights_analyse( x264_t *h, x264_frame_t *fenc, x264_frame_t *ref, int b_lookahead )
  
      {
  
          int i_delta_index = fenc->i_frame - ref->i_frame - 1;

  I surely am missing something as I am sure this encoder works for most people :) Does anyone have an idea why this first frame in the "frames" array is null ?

  Many thanks

• FFMPEG x264 encoding on Android - error with lookahead

  6 janvier 2013, par Tishu

  I am using FFMPEG + x264 on Android to encode YUV420 frames to a video file. I use the following code on each frame to encode them :

  avcodec_encode_video2(gVideoWriteCodecCtx, &packet, pCurrentFrame, &gotPacket);

  On the first few calls, the frame buffer gets filled and nothing is encoded. When the first encoding happens, a call is made to x264_lookahead_get_frames. I can see there that my frame array is correctly populated, but the first item is NULL. As a consequence, in x264_weights_analyse the reference frame gotten as frames[p0] is NULL and I get an exception there.

  slicetype.c, the first frame in "frames" is NULL

  if( h->param.analyse.i_weighted_pred && b == p1 )
  
      {
  
          x264_emms();
  
          x264_weights_analyse( h, fenc, frames[p0], 1 );
  
          w = fenc->weight[0];
  
      }

  And the exception happens there, ref is NULL

  static void x264_weights_analyse( x264_t *h, x264_frame_t *fenc, x264_frame_t *ref, int b_lookahead )
  
      {
  
          int i_delta_index = fenc->i_frame - ref->i_frame - 1;

  I surely am missing something as I am sure this encoder works for most people :) Does anyone have an idea why this first frame in the "frames" array is null ?

  Many thanks

• Powershell Script Exits Handbrake CLI

  23 décembre 2014, par Arnav Attri

  With the help of google, I workaround a Powershell script for handbrake automation. Now, the issue is when the source folder is empty the Powershell script exits.

  Here’s the scenario :

  1. I downloaded someone files - automated via RSS.
  2. They are placed in source folder.
  3. Powershell script works and encoding starts and successfully gets over.
  4. Now, when the encode is completed and in case of new download/file doesn’t arrive in the source folder, the script exits.

  Code is in PasteBin which has more comments but should be easy to infer what the script does

  $inputpath = "I:\S" 
  
  $outputpath = "I:\E"
  
  
  
  $movies = ls $inputpath
  
  
  
  foreach($movie in $movies){
  
      $name = $movie.basename
  
  
  
      if(!(test-path -path "$outputpath\$name.mkv")){
  
          C:\"Program Files"\handbrake\HandBrakeCLI.exe -i "$inputpath\$movie" -o "$outputpath\$name.mkv" `
  
          -e x264 -b 1000 -2 -T -a 1,1 -E mp3 -B 112 --mixdown stereo -f mkv --detelecine --decomb `
  
          --loose-anamorphic -m -x rc-lookahead=30:ref=4:bframes=3:me=umh:subme=9:analyse=none:deblock=1:0:0:8x8dct=1
  
      }
  
  }