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• ffmpeg av_interleaved_write_frame() : Broken pipe under windows

  7 avril 2016, par Allen

  I am using ffmpeg to convert original media file to rawvideo yuv format, ouputed the yuv to pipe, then my command tool receive the raw yuv as input, do some processing.

  e.g :

  D:\huang_xuezhong\build_win32_VDNAGen>ffmpeg -i test.mkv -c:v rawvideo -s 320x240 -f rawvideo - | my_tool -o output

  every time, when run the command, ffmpeg will dump this av_interleaved_write_frame(): Broken pipe error msg :

  Output #0, rawvideo, to 'pipe:':
  
    Metadata:
  
    encoder         : Lavf56.4.101
  
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 120:91 DAR 160:91], q=2-31, 200 kb/s, 24 fps, 24 tbn, 24 tbc (default)
  
    Metadata:
  
        encoder         : Lavc56.1.100 rawvideo
  
    Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  av_interleaved_write_frame(): Broken pipe
  
  frame=    1 fps=0.0 q=0.0 Lsize=     112kB time=00:00:00.04 bitrate=22118.2kbits/s
  
  video:112kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
  
  verhead: 0.000000%
  
  Conversion failed!

  in my souce code : it take stdin as the input file, every time, it read a frame size content from it, if the content read is less than a frame size, then continue read, until a frame is fetched, then it use the frame content to generate something.

  int do_work (int jpg_width, int jpg_height) 
  
  {
  
  int ret = 0;
  
  
  
  FILE *yuv_fp = NULL;
  
  unsigned char * yuv_buf = NULL;
  
  int frame_size = 0;
  
  int count = 0;
  
  int try_cnt = 0;
  
  
  
  frame_size = jpg_width * jpg_height * 3 / 2;
  
  va_log (vfp_log, "a frame size:%d\n", frame_size);
  
  
  
  yuv_fp = stdin;
  
  
  
  yuv_buf = (unsigned char *) aligned_malloc_int(
  
          sizeof(char) * (jpg_width + 1) * (jpg_height + 1) * 3, 128);
  
  
  
  if (!yuv_buf) {
  
      fprintf (stderr, "malloc yuv buf error\n");
  
      goto end;
  
  } 
  
  
  
  memset (yuv_buf, 0, frame_size);
  
  while (1) {
  
  
  
      try_cnt++;
  
      va_log (vfp_log, "try_cnt is %d\n", try_cnt);
  
  
  
      //MAX_TRY_TIMES = 10
  
      if (try_cnt > MAX_TRY_TIMES) {
  
          va_log (vfp_log, "try time out\n");
  
          break;
  
      }
  
  
  
      count = fread (yuv_buf + last_pos, 1, frame_size - last_pos, yuv_fp);
  
      if (last_pos + count < frame_size) {
  
          va_log (vfp_log, "already read yuv: %d, this time:%d\n", last_pos + count, count);
  
          last_pos += count;
  
          continue;
  
      }
  
  
  
      // do my work here
  
  
  
      memset (yuv_buf, 0, frame_size);
  
      last_pos = 0;
  
      try_cnt = 0;
  
  }
  
  
  
  end:
  
  if (yuv_buf) {
  
      aligned_free_int (yuv_buf);
  
  }
  
  
  
  return ret;
  
  }

  my log :

  2016/04/05 15:20:38 : a frame size:115200
  2016/04/05 15:20:38 : try_cnt is 1
  2016/04/05 15:20:38 : already read yuv : 49365, this time:49365
  2016/04/05 15:20:38 : try_cnt is 2
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 3
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 4
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 5
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 6
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 7
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 8
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 9
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 10
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 11
  2016/04/05 15:20:38 : try time out
  ```

  my question :

  when piping used ,does ffmpeg write content to pipe buffer as soon as it has content, or it will buffer some size content, then flushes them to pipe ?Maybe some internal logic that I misunderstood,any one could help explain or fix my code ?

  PS : this command run ok under linux.

• Cropping video with FFmpeg increases the tbn value too much

  5 avril 2016, par TOP

  Here is the information of original video :

   Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2016-04-05 03:00:09
  
    Duration: 00:01:50.09, start: 0.000000, bitrate: 8131 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt470bg/bt470bg/smpte170m), 1920x1080, 7995 kb/s, SAR 1:1 DAR 16:9, 44.49 fps, 90k tbr, 90k tbn, 180k tbc (default)

  Then I used this ffmpeg command to crop video :

  ffmpeg -i file.mp4 -vf "crop=480:480:0:0" -b:v 2048k -preset ultrafast cropped.mp4

  Here is the information of cropped video :

   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.28.101
  
    Duration: 00:01:50.16, start: 0.023220, bitrate: 1078 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1282x716 [SAR 1:1 DAR 641:358], 1002 kb/s, 44.49 fps, 44.49 tbr, 220455000.00 tbn, 88.98 tbc (default)

  The default video player of my phone cannot play this video. If I use MX Player I have to change the decoder to Software decoder (instead of Hardware) to open it.

  I noticed that the tbn value was increased after reencoding. The old value is 90k. The new value is 220455k. Maybe it is the reason why the default video player doesn’t work.

  Question : why is the tbn value so big ? How to avoid it ?

• Running frei0r filters with ffmpeg - "Could not find module 'pixeliz0r'."

  4 avril 2016, par ksloan

  I installed frei0r using homebrew

  MacK:tmp kevin$ brew list frei0r
  
  /usr/local/Cellar/frei0r/1.4/include/frei0r.h
  
  /usr/local/Cellar/frei0r/1.4/lib/frei0r-1/ (119 files)
  
  /usr/local/Cellar/frei0r/1.4/lib/pkgconfig/frei0r.pc
  
  /usr/local/Cellar/frei0r/1.4/share/doc/ (4 files)

  Then I installed ffmpeg with the --with-frei0r flag, and everything compiled fine

  brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-libass --with-libquvi --with-libvorbis --with-libvpx --with-opus --with-x265 --with-frei0r

  I tried telling ffmpeg where my frie0r filters were installed with

  export FREI0R_PATH=/usr/local/Cellar/frei0r/1.4/lib/frei0r-1/

  I even created symlinks from the default locations ffmpeg checks...

  MacK:tmp kevin$ ls -l  /usr/local/lib/frei0r-1
  
  lrwxr-xr-x  1 kevin  admin  33  4 Apr 04:43 /usr/local/lib/frei0r-1 -> ../Cellar/frei0r/1.4/lib/frei0r-1

  But I’m still seeing this error :

  [Parsed_frei0r_0 @ 0x7f8938f003c0] Could not find module 'perspective'.
  
  [AVFilterGraph @ 0x7f8938f00160] Error initializing filter 'frei0r' with args 'perspective'
  
  Error initializing complex filters.
  
  Invalid argument

  Full output :

  MacK:tmp kevin$ ffmpeg -i 1.mp4 -filter_complex "frei0r=perspective" out.mp4
  
  ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libvorbis --enable-libvpx --enable-libass --enable-ffplay --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libx265 --enable-nonfree --enable-vda
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.25.100
  
    Duration: 00:00:08.34, start: 0.023220, bitrate: 4293 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 4161 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [Parsed_frei0r_0 @ 0x7f8938f003c0] Could not find module 'perspective'.
  
  [AVFilterGraph @ 0x7f8938f00160] Error initializing filter 'frei0r' with args 'perspective'
  
  Error initializing complex filters.
  
  Invalid argument

  I’ve run out of ideas to try next, what am I missing ? Any help would be greatly appreciated.