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• node-fluent-ffmpeg doesn't resize videos correctly when given specific size

  8 décembre 2019, par Yagiz

  Version information

  • fluent-ffmpeg version : 2.1.2
  • ffmpeg version : ffmpeg version 4.1.3
  • OS : mac os x mojave 10.14.3

  Code to reproduce

  First cut the videos using this command :

  const cutVideo = async (currentWord) => {
  
      return new Promise((resolve, reject) => {
  
          console.log('cutting video', currentWord.file)
  
          ffmpeg(currentWord.file)
  
              .videoCodec('libx264')
  
              // .addOptions('-vf "setdar=ratio=16/9:max=1000"')
  
              .on('start', command => console.log('command', command))
  
              .on('error', reject)
  
              .on('end', resolve)
  
              .withSize('640x360')
  
              .withAspect('16:9')
  
              .applyAutopadding(true, 'black')
  
              .saveToFile(currentWord.file.replace('-unfinished', ''), './')
  
      })
  
  }

  Later merge them together using .mergeToFile() command :

  const mergeFilesAsync = async function(files, folder, filename)
  
  {
  
      return new Promise((resolve, reject) => {
  
          console.log('merging files', files)
  
          var cmd = ffmpeg({ logger: console })
  
              .videoCodec('libx264')
  
              .on('start', command => console.log('command', command))
  
              .on('error', reject)
  
              .on('end', resolve)
  
  
  
          for (var i = 0; i < files.length; i++)
  
          {
  
              const currentWord = files[i]
  
              cmd.input(currentWord.file.replace('-unfinished', ''))
  
          }
  
  
  
          cmd.mergeToFile(folder + "/" + filename, folder);
  
      });
  
  }

  Expected results

  The videos resized in cutVideo function should have 640x360 size with 16:9 aspect ratio.

  Observed results

  The first video processed had a dimension of : 850 × 480, the output after processing it is : 642 × 360 (It should be 640x360)

  The second video processed had a dimension of : 1152 × 480, the output after processing it is : 638 × 360

  The third video processed had a dimension of 853 × 480, the output after processing it is : 642 × 360

  FFmpeg command produced by fluent-ffmpeg :

  ffmpeg -i /Users/yagiz/Desktop/video-creator/what's-unfinished.mp4 -y -vcodec libx264 -filter:v scale=w='if(gt(a,1.7777777777777777),640,trunc(360*a/2)*2)':h='if(lt(a,1.7777777777777777),360,trunc(640/a/2)*2)',pad=w=640:h=360:x='if(gt(a,1.7777777777777777),0,(640-iw)/2)':y='if(lt(a,1.7777777777777777),0,(360-ih)/2)':color=black /Users/yagiz/Desktop/video-creator/what's.mp4
  
  cutting video /Users/yagiz/Desktop/video-creator/up?-unfinished.mp4

  and

  ffmpeg -i /Users/yagiz/Desktop/video-creator/up?-unfinished.mp4 -y -vcodec libx264 -filter:v scale=w='if(gt(a,1.7777777777777777),640,trunc(360*a/2)*2)':h='if(lt(a,1.7777777777777777),360,trunc(640/a/2)*2)',pad=w=640:h=360:x='if(gt(a,1.7777777777777777),0,(640-iw)/2)':y='if(lt(a,1.7777777777777777),0,(360-ih)/2)':color=black /Users/yagiz/Desktop/video-creator/up?.mp4

  I think that 1.77777 value in this command produces a lower bound or an upper bound of the actual item.

  Any idea where the issue lies ?

  Thanks !

• OpenCV - Generate adaptive background for video

  17 avril 2019, par bozzmob

  I want to achieve something like this-

  Reference Video

  Say I have a video which is a vertical video(Dimension- 720x1280). I want to create a horizontal video with adaptive background like the video I’ve shown.
  I have written some code for reading and writing to a file.

  video_index = 0
  
  cap = cv2.VideoCapture(videofiles[0])
  
  
  
  # video resolution: 1920x1080 px
  
  out = cv2.VideoWriter("video.mp4v",
  
                        cv2.VideoWriter_fourcc(*'MP4V'),
  
                        30, (1920, 1080), 1)

  What is the effect of having background to the video which smudges on the sides called in opencv/ffmpeg or otherwise ?
  How do I achieve this effect using code or tools(I am open to using OSS desktop tools) ?

• PHP/FFmpeg can not save video

  19 mai 2019, par tour travel

  The error is :

  [Sun May 19 11:41:03.158185 2019] [php7:error] [pid 32405] [client
  85.133.232.4:35172] PHP Fatal error : Uncaught Alchemy\BinaryDriver\Exception\ExecutionFailureException : ffmpeg
  failed to execute command ’/usr/bin/ffmpeg’ ’-y’ ’-i’ ’Sample.mp4’
  ’-async’ ’1’ ’-metadata:s:v:0’ ’start_time=0’ ’-f’ ’webm’ ’-vcodec’
  ’libvpx’ ’-acodec’ ’libvorbis’ ’-b:v’ ’1000k’ ’-refs’ ’6’ ’-coder’ ’1’
  ’-sc_threshold’ ’40’ ’-flags’ ’+loop’ ’-me_range’ ’16’ ’-subq’ ’7’
  ’-i_qfactor’ ’0.71’ ’-qcomp’ ’0.6’ ’-qdiff’ ’4’ ’-trellis’ ’1’ ’-b:a’
  ’128k’ ’-vf’ ’[in]scale=320:240 [out]’ ’export-webm.webm’ in
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php:100\nStack
  trace :\n#0
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php(72) :
  Alchemy\BinaryDriver\ProcessRunner->doExecutionFailure(’’/usr/bin/ffmpe...’)\n#1
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php(209) :
  Alchemy\BinaryDriver\ProcessRunner->run(Object(Symfony\Component\Process\Process),
  Object(SplObjectStorage), false)\n#2
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php(137) :
  Alchemy\BinaryDr in
  /vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Media/AbstractVideo.php on
  line 106a

  What I trying to do is, save video :

  require '/vendor/autoload.php';
  
  $ffmpeg = FFMpeg\FFMpeg::create();
  
  $ffprobe = FFMpeg\FFProbe::create();
  
  $video = $ffmpeg->open('Sample.mp4');
  
  $video
  
      ->filters()
  
      ->resize(new FFMpeg\Coordinate\Dimension(320, 240))
  
      ->synchronize();
  
  $video
  
      ->save(new FFMpeg\Format\Video\X264('aac'), 'export-x264.mp4')

  What I have done :

  I searched and similar topics tell me to set permission to my files and folders, I set user and also set 755 to files and folders but still I have this error and no success, any idea ?

  Errorlog :

  Fatal error : Uncaught
  Alchemy\BinaryDriver\Exception\ExecutionFailureException : ffmpeg
  failed to execute command ’/usr/bin/ffmpeg’ ’-y’ ’-i’ ’Sample.mp4’
  ’-async’ ’1’ ’-metadata:s:v:0’ ’start_time=0’ ’-vcodec’ ’libx264’
  ’-acodec’ ’aac’ ’-b:v’ ’1000k’ ’-refs’ ’6’ ’-coder’ ’1’
  ’-sc_threshold’ ’40’ ’-flags’ ’+loop’ ’-me_range’ ’16’ ’-subq’ ’7’
  ’-i_qfactor’ ’0.71’ ’-qcomp’ ’0.6’ ’-qdiff’ ’4’ ’-trellis’ ’1’ ’-b:a’
  ’128k’ ’-vf’ ’[in]scale=320:240 [out]’ ’-pass’ ’1’ ’-passlogfile’
  ’/tmp/ffmpeg-passes5ce11d01dc0038yfbl/pass-5ce11d01dc0c7’
  ’export-x264.mp4’ in
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php:100
  Stack trace : #0
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php(72) :
  Alchemy\BinaryDriver\ProcessRunner->doExecutionFailure(’’/usr/bin/ffmpe...’)

  1 /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php(209) :

  Alchemy\BinaryDriver\ProcessRunner->run(Object(Symfony\Component\Process\Process),
  Object(SplObjectStorage), false) #2 /vendor/alchemy/binary-driver in
  /vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Media/AbstractVideo.php on
  line 106