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• Revision 8db2675b97 : Adding ss_size_lookup table. Removing the old one bsize_from_dim_lookup. Now we

  8 août 2013, par Dmitry Kovalev

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_common_data.c

  
   Modify /vp9/common/vp9_common_data.h

  
   Modify /vp9/common/vp9_enums.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Adding ss_size_lookup table.

  Removing the old one bsize_from_dim_lookup. Now we have a way to determine
  block size for plane using its subsampling values (ss_size_lookup). And
  then we can find the number of pixels in the block (num_pels_log2_lookup).

  Change-Id : I6fc981da2ae093de81741d3d78eaefed11015db9

• How to tell if ffmpeg errored ?

  12 septembre 2011, par Eric

  The Situation :
  I'm using ffmpeg (via php) to convert video files. I configured my convert script to return the output (as the $error array) from the exec() command. My assumption was that if no error occurred, $error would be an empty array.

  The Problem :
  The problem is that, the script returns output even if there was no error in conversion. (I can tell that there was no error because a playable video file is output.)

  The Question :
  How does ffmpeg format its errors/output ? I want to be able to parse this and determine if an error occurred and what error it was.

  Thanks !

  Code :
  *An example of a non-error output :

  FFmpeg version git-N-29201-g37c0a44, Copyright (c) 2000-2011 the FFmpeg developers|  built on Sep  9 2011 23:29:21 with gcc 4.1.2 20080704 (Red Hat 4.1.2-50)|  configuration: --prefix=/usr/local/hgffmpeg --enable-shared --enable-nonfree --enable-avfilter --enable-filter=movie --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/hgffmpeg/include/ --extra-ldflags=-L/usr/local/hgffmpeg/lib --enable-decoder=ac3 --enable-decoder=asv1 --enable-decoder=asv2 --enable-decoder=flac --enable-decoder=wmv1 --enable-decoder=wmv2 --enable-decoder=wmv3 --enable-decoder=mpeg1video --enable-decoder=mpeg2video --enable-decoder=flv --enable-decoder=fraps --enable-decoder=h263 --enable-decoder=h264 --enable-decoder=libgsm --enable-decoder=mjpeg --enable-decoder=mpeg4 --enable-decoder=mpeg4aac --enable-decoder=mpegvideo --enable-decoder=mpeg4aac --enable-decoder=msmpeg4v1 --enable-decoder=msmpeg4v2 --enable-decoder=msmpeg4v3 --enable-decoder=pcm_alaw --enable-decoder=pcm_mulaw --enable-encoder=ac3 --enable-encoder=asv1 --enable-encoder=asv2 --enable-encoder=flac --enable-encoder=h263 --enable-encoder=flashsv --enable-encoder=flv --enable-encoder=libgsm --enable-encoder=mjpeg --enable-encoder=msmpeg4v3 --enable-encoder=pcm_alaw --enable-encoder=pcm_mulaw --enable-encoder=mpeg1video --enable-encoder=mpeg2video --enable-encoder=mpeg4 --enable-encoder=msmpeg4v1 --enable-encoder=msmpeg4v2 --enable-encoder=rv10 --enable-encoder=rv20 --enable-encoder=vorbis --enable-encoder=wmav1 --enable-encoder=wmav2 --enable-encoder=wmv1 --enable-encoder=wmv2 --disable-demuxer=v4l --disable-demuxer=v4l2 --enable-version3|  libavutil    50. 40. 1 / 50. 40. 1|  libavcodec   52.120. 0 / 52.120. 0|  libavformat  52.108. 0 / 52.108. 0|  libavdevice  52.  4. 0 / 52.  4. 0|  libavfilter   1. 79. 1 /  1. 79. 1|  libswscale    0. 13. 0 /  0. 13. 0|[mpeg1video @ 0x1f6d030] skipped MB in I frame at 5 0|[mpeg1video @ 0x1f6d030] Warning MVs not available|[mpeg1video @ 0x1f6d030] concealing 260 DC, 260 AC, 260 MV errors|[mpegvideo @ 0x1f6a660] Estimating duration from bitrate, this may be inaccurate|Input #0, mpegvideo, from '../uploads/test_vid/unencodedVideo.mpg':|  Duration: 00:00:00.01, bitrate: 104860 kb/s|    Stream #0.0: Video: mpeg1video, yuv420p, 320x200 [PAR 1:1 DAR 8:5], 104857 kb/s, 23.98 fps, 23.98 tbr, 1200k tbn, 23.98 tbc|WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s|File '../uploads/test_vid/video.flv' already exists. Overwrite ? [y/N] Not overwriting - exiting

• detecting a timeout in ffmpeg

  19 mai 2015, par Sean

  I am writing some software that uses ffmpeg extensively and it is multi threaded, with multiple class instances.

  If the network connection drops out ffmpeg hangs on reading. I found a method to assign a callback that ffmpeg fires periodically to check if it should abort or not :

  static int interrupt_cb(void *ctx) 
  
  { 
  
  
  
  // do something 
  
      return 0;
  
  } 
  
  
  
  static const libffmpeg::AVIOInterruptCB int_cb = { interrupt_cb, NULL }; 

  ...

  AVFormatContext* formatContext = libffmpeg::avformat_alloc_context( );
  
  formatContext->interrupt_callback = int_cb; 
  
  if ( libffmpeg::avformat_open_input( &formatContext, fileName, NULL, NULL ) !=0 ) {...}

  This is all fine but nowhere on the web can i find what *ctx contains and how to determine whether the callback should return 1 or 0. I can’t assign a static "abort" flag as the class has many instances. I also can’t debug the code as for some reason visual studio refuses to set a breakpoint on the return 0 ; line, claiming no executable code is associated with the location. Any ideas ?