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• How to segment a video and then concatenate back into original one with ffmpeg

  23 décembre 2016, par steve

  I am surveying on distributed video transcoding with FFmpeg. I have found that there is a good script on https://github.com/nergdron/dve/blob/master/dve.

  The script mainly uses the segment and concatenate filters of FFmpeg. I want to do a simple test first. However, I can not split the video into segments and then concatenate back to original video (with the same codec). I have tried with the following command :

  a. Chunk the video

  ffmpeg -fflags +genpts -i Test.avi -map 0 -codec copy -f segment -segment_format avi -v error chunk-%03d.seg

  b. Building the chunking list :

  #!/bin/bash -e
  
  set -e
  
  echo "ffconcat version 1.0" > concat.txt
  
  for f in `ls chunk-*.seg | sort`; do
  
  echo "file $f" >> concat.txt
  
  done

  c. Concatenate the chunks

  ffmpeg  -y -v error -i concat.txt -f concat -map 0 -c copy -f avi output.avi

  Then when I run ffprobe I get the following message which says it is a non-interleaved AVI :

      ffprobe version N-82301-g1bbb18f Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 35.100 / 55. 35.100
  
    libavcodec     57. 66.101 / 57. 66.101
  
    libavformat    57. 57.100 / 57. 57.100
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 66.100 /  6. 66.100
  
    libswscale      4.  3.100 /  4.  3.100
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  [avi @ 00000000028e3700] non-interleaved AVI
  
  Input #0, avi, from 'output.avi':
  
    Metadata:
  
      encoder         : Lavf57.57.100
  
    Duration: 74:43:47.82, start: 0.000000, bitrate: 17 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 112 kb/s

  I have tried a few other things without success. Any help would be greatly appreciated. Thanks in advance !!

• Why does the compiler convert bool to integer and back to bool instead of returning the bool itself ?

  22 juin 2016, par Jack

  I was reading VideoFileWriter class from AForge.Video.FFMPEG assembly via ILSPY (I was interested to see how a particular method works) and found this :

  public bool IsOpen {
  
      [return: MarshalAs(UnmanagedType.U1)]
  
      get {
  
          return ((this.data != null) ? 1 : 0) != 0;
  
      }
  
  }

  What’s the reason to do that bool to integer than back to bool conversion rather just do this.data != null ?

• Changelog : Add back "version next"

  6 mars 2015, par Michael Niedermayer

  Changelog : Add back "version next"
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] Changelog