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• ffmpeg how do I choose the correct Audio track ?

  28 février 2020, par Duk

  I’m converting a few .mkv files and need to choose the right Audio track, but dont know how.

  This is the command I use :

  ffmpeg -i "movie.mkv" -vcodec h264 -acodec aac -strict -2 output.mp4

  It is recommended by the webservice where I want to upload the video.

  Let’s say the Audiotracks look like this :

  mkvmerge -i "movie.mkv"
  
  
  
  Track ID 0: video (MPEG-4p10/AVC/h.264)
  
  Track ID 1: audio (AC-3)
  
  Track ID 2: audio (TrueHD)
  
  Track ID 3: subtitles (HDMV PGS)

  How do I select "Track 1" or "Track 2" for Output ?
  And which track will be selected, if I leave the Code like that ? (and why ?)

  Thanks for help !

• Overlay animated images with transparency over a static background image using ffmpeg ?

  17 février 2015, par Jona

  I’m looking to create a video using a set of png images that have transparency merged with a static background.

  After doing a lot of digging I seems like it’s definitely possible by using the filters library.

  My initial video making without including the background is :

  ffmpeg -y -qscale 1 -r 1 -b 9600 -loop -i bg.png -i frame_%d.png -s hd720 testvid.mp4

  Using -vf I can apply the background as overlay :

  ffmpeg -y -qscale 1 -r 1 -b 9600 -i frame_%d.png -vf "movie=bg.png [wm];[in][wm] overlay=0:0 [out]" -s hd720 testvid.mp4

  However the problem is it’s overlaying the background over the input. According libacfilter I can split the input and play with it’s content. I’m wondering if I can somehow change the overlay order ?

  Any help greatly appreciated !

  UPDATE 1 :
  I’m trying to make the following filter work but I’m getting the movie without the background :

  ffmpeg -y -qscale 1 -r 1 -b 9600 -i frame_%d.png -vf "movie=bg.png [bg]; [in] split [T1], fifo, [bg] overlay=0:0, [T2] overlay=0:0 [out]; [T1] fifo [T2]" -s hd720 testvid.mp4

  UPDATE 2 :
  Got video making using -vf option. Just piped the input slit it applied image over it and overlayed the two split feeds ! Probably not the most efficient way... but it worked !

  ffmpeg -y -r 1 -b 9600 -i frame_%d.png -vf "movie=bg.png, scale=1280:720:0:0 [bg]; [in] format=rgb32, split [T1], fifo, [bg] overlay=0:0, [T2] overlay=0:0 [out]; [T1] fifo [T2]" -s hd720 testvid.mp4

• Is there any way that I can speed up the ffmpeg processing time

  20 mai 2020, par Ahmed Al-Rayan

  I am facing a problem with the processing process. I use a real joint server in a digital hosting package of $ 10 and use cloud service from Amazon s3. The problem is when uploading a video, whatever the size of the video, whether its size is 1 megabyte or 2 Giga. After the upload process, the processing process starts to upload, there is no problem But when the processing process takes a very long time so that I cannot complete it, what is the solution to that, is there a problem for me or is this process normal ?
 I use laravel-ffmpeg and through laravel queue I am cutting the video into several qualities I will attach the code to you below.

  



  public function handle()
{
    //180p
    $lowBitrate1 = (new X264('aac'))->setKiloBitrate(613);
    //270p
    $lowBitrate2 = (new X264('aac'))->setKiloBitrate(906);
    //360p
    $midBitrate1 = (new X264('aac'))->setKiloBitrate(1687);
    //540p
    $midBitrate2 = (new X264('aac'))->setKiloBitrate(2227);
    //720p
    $highBitrate1 = (new X264('aac'))->setKiloBitrate(4300);
    //1080
    $highBitrate2 = (new X264('aac'))->setKiloBitrate(7917);

FFMpeg::fromDisk('s3')
    ->open($this->movie->path)
    ->exportForHLS()
    ->onProgress(function ($percent) {
        $this->movie->update([
            'percent' => $percent
        ]);
    })
    ->setSegmentLength(10)// optional
    ->addFormat($lowBitrate1)
    ->addFormat($lowBitrate2)
    ->addFormat($midBitrate1)
    ->addFormat($midBitrate2)
    ->addFormat($highBitrate1)
    ->addFormat($highBitrate2)
    ->toDisk('s3')
    ->save("public/Movies/{$this->movie->id}/{$this->movie->id}.m3u8");
}//end of handle