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• How to probe starting at a specific point in a video using ffmpeg/ffprobe

  28 février 2013, par user1526912

  Does anyone knows if there is an option when executing ffprobe to start probing at a specific time in a video.

  Here is an example of my script :

  ffprobe -show_frames -pretty -pretty test.mp4 > testresults.mp4

  The problem is the result files are too big because my videos are 3 minutes long.

  I just need to probe the last 40 seconds of the videos

• mp4fragment generates negative start time

  23 janvier 2018, par Benson Chang

  I found that when I use mp4fragment to generate fragmented mp4 file, ffmpeg gives negative start time rather than zero start time.

  My question is :

  1. Is this correct
  2. If not how should I fix it ?

  Following is the log of ffprobe for the original video.

  ffprobe version 3.4.1-1~16.04.york0 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.5) 20160609
  
    configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Waterside_Trail.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.32.100
  
    Duration: 00:05:01.12, start: 0.000000, bitrate: 13495 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 4096x2048 [SAR 1:1 DAR 2:1], 13358 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  The command to fragment mp4

   mp4fragment Waterside_Trail.mp4 Waterside_Trail_frag.mp4

  FFprobe result of the fragmented mp4

  ffprobe version 3.4.1-1~16.04.york0 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.5) 20160609
  
    configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Waterside_Trail_frag.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41iso5
  
   *Duration: 00:05:01.12, start: -0.023220, bitrate: 13489 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 4096x2048 [SAR 1:1 DAR 2:1], 13358 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : Bento4 Video Handler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : Bento4 Sound Handler

  And you can see the line with asterisk, there’s a negative start time of -0.023220.

• Passing negative values for dimensions with PHP FFMpeg

  10 juin 2018, par Matthew Daly

  I’m working on a legacy project that uses FFMpeg to process videos on upload. The code I inherited uses escapeshellarg() to run FFMpeg from the command line, which is problematic because it doesn’t provide any means of keeping track of progress, so I’m rewriting it using PHP-FFMpeg.

  I’m a bit stumped at the point of resizing the videos. The aspect ratio needs to remain the same, so the dimensions passed to the command line for the scale were -vf scale=-1:720, and my interpretation of the documents is that you need to pass the dimensions through as follows :

  $dimension = new FFMpeg\Coordinate\Dimension('-1', '720');
  
  $video->filters()->resize($dimension)->synchronize();

  However, the constructor of the Dimension class only accepts integers, and it’s unclear how I’d go about specifying a negative dimension here. Google hasn’t been very useful, nor have the existing issues on the project.

  Any idea how I could pass through the required dimensions ? I don’t often use FFMpeg so I’m not terribly familiar with it.