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Autres articles (44)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
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  • Websites made ​​with MediaSPIP

    2 mai 2011, par

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  • Creating farms of unique websites

    13 avril 2011, par

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Sur d’autres sites (7722)

  • 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.

  • swscale/x86/swscale : Fix undefined left shifts of negative numbers

    28 septembre 2019, par Andreas Rheinhardt
    swscale/x86/swscale : Fix undefined left shifts of negative numbers

    This affected many FATE-tests : The number of failing tests went down
    
from 663 to 344. (Both numbers exclude tests that failed because of
    
unaligned accesses in code that is inside #if HAVE_FAST_UNALIGNED.)
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libswscale/x86/swscale.c

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