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• Why won't Apple players play this ffmpeg-generated video ? [duplicate]

  3 octobre 2018, par Giuseppe

  This question already has an answer here :

  • ffmpeg PNG to mp4 - Black screen
    
    1 answer
    

  I generated a short mp4 from a stack of PNG images, with no audio, like so :

  ffmpeg -r 24 -i t-%03d.png -r 24 -c:v libx264 test.mp4

  On my MacBook, the resulting video plays just fine with VLC or Chrome. With iTunes or Final Cut Pro, on the other hand, the progress bar moves as if playing was in progress, but the screen is blank. Finally, Safari and QuickTime complain that the format is invalid.

  Here is ffprobe’s output :

  ffprobe version 4.0.2 Copyright (c) 2007-2018 the FFmpeg developers
  
    built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:00:20.17, start: 0.000000, bitrate: 3918 kb/s
  
      Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuvj444p(pc), 1600x1200 [SAR 1:1 DAR 4:3], 3916 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

• Choose your favourite logo

  28 septembre 2018, par Matomo Core Team — Community

  We’ve been searching for a new logo and we are now down to the final three designs. We want you, the community, to help us choose our logo as we set the scene for a refreshed and vibrant new look for Matomo.

  Please choose your favourite Matomo logo from the three options below. Voting limited to once per person :)

  • Choose your favorite logo*
    • 
    • 
    • 

  
  
  
  
  

• FFMPEG Concat filter - Output video skips second file

  16 octobre 2018, par Rune Aspvik

  I am using the ffmpeg concat filter to join video files. I am aware the files must be exactly the same format for concat to work without encoding. However, the output of these two files are not seemless. The video will stop when it switches to second video file.

  Here is the output of the two video files.

  SKYbum:~ Aspvik$ ffmpeg -i /Users/Aspvik/Desktop/newIntro.mp4 -i /Users/Aspvik/Downloads/wetransfer-008789/Middle.mp4 
  
  ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/Aspvik/Desktop/newIntro.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.12.100
  
    Duration: 00:00:08.87, start: 0.000000, bitrate: 7160 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 7159 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/Aspvik/Downloads/wetransfer-008789/Middle.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Netcam Studio 1.6.1.0
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:19.47, start: 0.033008, bitrate: 676 kb/s
  
      Stream #1:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 674 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  The command I’m using for the concat is :

  ffmpeg -f concat -safe 0 -i /Users/Aspvik/Desktop/files.txt -codec copy -y /Users/Aspvik/Desktop/video.mp4

  Can anyone see what could be wrong ?