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• Revision 040ffb6326 : Minor adjustment in unit tests The CpuSpeedTest is extended to cover 2pass good

  13 septembre 2013, par Yaowu Xu

  Changed Paths :
   Modify /test/borders_test.cc

  
   Modify /test/cpu_speed_test.cc

  
  
  Minor adjustment in unit tests

  The CpuSpeedTest is extended to cover 2pass good quality with CpuUsed
  from 0 to 4. The BordersTest is changed to use CpuUsed 1 for faster
  turn around.

  Change-Id : I005e89adee7fe63af4b1f2a76a3a13ea826feadf

• what is a good way to calculate frame rate of a video using ffmpeg ?

  25 septembre 2013, par user1914692

  I find two possible ways :

  (Option 1)
  inVStruct.inVideoStream->r_frame_rate.num / inVStruct.inVideoStream->r_frame_rate.den

  [comment :] correct for some videos. Not always correct.
  it is libavformats guess, not exact. (see http://ffmpeg.org/pipermail/ffmpeg-devel/2005-May/003079.html )

  (Option 2)
  (double) inVStruct.inCodecContext->time_base.den / inVStruct.inCodecContext->time_base.num / inVStruct.inCodecContext->ticks_per_frame) ;

  [comment :] correct for some videos. Not always correct.

  Please recommend one for all video files.

• What is a good way to calculate the frame rate of a video file using ffmpeg ?

  25 septembre 2013, par user1914692

  I find two possible ways :

  (Option 1)
  inVStruct.inVideoStream->r_frame_rate.num / inVStruct.inVideoStream->r_frame_rate.den

  [comment :] correct for some videos. Not always correct.
  it is libavformats guess, not exact. (see http://ffmpeg.org/pipermail/ffmpeg-devel/2005-May/003079.html )

  (Option 2)
  (double) inVStruct.inCodecContext->time_base.den / inVStruct.inCodecContext->time_base.num / inVStruct.inCodecContext->ticks_per_frame) ;

  [comment :] correct for some videos. Not always correct.

  Please recommend one for all video files.