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• Is this transcoding the video ?

  2 août 2018, par Michael Minton

  I have an application used in government and subject to regulation that prevents transcoding or altering the video quality in any way.

  I’m attempting to utilize FFmpeg to change a video into an MP4 by copying the raw streams to a new container.

  This is the command being used :

  ffmpeg.exe -y -i INPUT.ASF -c:av copy OUTPUT.MP4

  Notice the -c:av copy. The FFmpeg documentation says, “a special value copy (output only) to indicate that the stream is not to be re-encoded.“

  Visually the videos before and after appear to be identical quality with no pixelation on the ships.

  Is this altering the video quality or could this be considered transcoding ?

• Issue with video compression using HLS from laravel protonemedia/laravel-ffmpeg package

  29 mars 2023, par Mateo Kantoci

  I'm using laravel-ffmpeg package in order to compress videos and save it as .m3u8.
In another words, I have a job that is gathering all uncompressed files and compress them 1by1 and save them to google cloud storage. Furthermore, compression is using exportForHLS from package and throws an error :

  


  ProtoneMedia\LaravelFFMpeg\Exporters\HLSPlaylistGenerator::getStreamInfoLine(): Return value must be of type string, null returned in /var/www/html/ipaparazzo/vendor/pbmedia/laravel-ffmpeg/src/Exporters/HLSPlaylistGenerator.php:32


  


  In some cases compression works but my job is failing for most of the time.

  


  Anyone experienced similar issue ?

  


  P.S. It is working as expected when using public storage.

  


  This is my code exactly as per laravel-ffmpeg documentation :

  


  ->exportForHLS()
->setSegmentLength(10) // optional
->setKeyFrameInterval(48) // optional
->addFormat($lowBitrate, function($media) {
    $media->scale(426, 240);
})
->addFormat($midBitrate, function($media) {
    $media->scale(640, 360);
})
->addFormat($highBitrate, function($media) {
    $media->scale(640, 480);
})
->onProgress(function ($percentage) {
   echo "{$percentage}% transcoded\n";
})
->toDisk('gcs2')
->save($videoPath)
->cleanupTemporaryFiles();


  


• Extract video clip from MP4 of exacting length [closed]

  21 janvier, par Wes

  The tools I've tried so far are only gives me approximations to the start and end times that I specify. They are usually off by a few seconds.

  


  I need a tool to extract video and audio at exact start and stop times, ideally to the millisecond. It would be preferable to do so without any easily noticeable loss in video quality from the original. I would also prefer to keep the audio in the video.