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• how to use crop and overlay properly ?

  21 juin 2022, par yuno saga

  Is crop and overlay have bug when chain too many ? i got inconsistent function. for test, i create horizontal flip builder command. i try to flip the video. but its like something wrong with overlay filter. the filter not overlay in specific location.

  


  let me explain my understanding of crop filter first. crop take 4 parameters : width:height:xPosition:yPosition. in first crop=16:480:0:0. how about if i want to crop 2nd image. is right with this crop=16:480:16:0 ? or it should crop=16:480:17:0 always add 1 after first crop ?

  


  and overlay, the first overlay. overlay=x=0:y=0. how about the 2nd overlay and so on ? is it right overlay=x=16:y=0 or it should overlay=x=17:y=0. always add 1 after first overlay.

  


  i tested it, always theres glitch in video.

  


  const { spawn } = require('child_process');

function hflip(width) {
    let filterCommands = '';
    const length = Math.floor(width / 16);

    for (let i=0; i < length; i++) {
        filterCommands += `[0]crop=16:480:${i*16}:0[c${i}];`;
    }
    
    for (let i=0; i < length; i++) {
        if (i == 0) filterCommands += '[0]';
        if (i != 0) filterCommands += `[o${i}]`;
    
        filterCommands += `[c${i}]overlay=x=${832-(i*16)}:y=0`;
    
        if (i != (length - 1)) filterCommands += `[o${i+1}];`;
    }

    return filterCommands;
}


const crops = spawn('ffmpeg', [
    '-i',
    'C:/Software Development/project/input.mp4',
    '-filter_complex',
    hflip(854),
    '-c:a',
    'copy',
    '-c:v',
    'libx264',
    '-crf',
    '30',
    '-preset',
    'ultrafast',
    'C:/Software Development/project/output.mp4',
    '-y'
], {
    cwd: 'C:/Software Development/ffmpeg'
})


  


• Disable default subtitle track with ffmpeg

  23 février 2023, par anonymous

  I'm creating an MKV container with 4 different files :

  


  

  • video.mp4

  


  • audio_en.mp4

  


  • audio_es.mp4

  


  • subtitles.ass

  


  


  For that I'm using the following ffmpeg script :

  


  ffmpeg -i video.mp4 -i audio_es.mp4 -i audio_en.mp4 -i subtitles.ass \
-map 0:v -map 1:a -map 2:a -map 3:s \
-metadata:s:a:0 language=spa \
-metadata:s:a:1 language=eng \
-metadata:s:s:0 language=spa -disposition:s:0 -default \
-default -c:v copy -c:a copy -c:a copy -c:s copy result.mkv


  


  The result.mkv looks awesome, everything works as expected except for one thing : subtitles are still set as the default track, so players like VLC shows them automatically. I've already tried plenty of different ways to avoid that to happen with the disposition flag but I cannot make it work.

  


  How should I modify the script so that the MKV does not have the subtitles track marked as default ?

  


  Thanks in advance !

  


• Anomalie #4500 : L’attribut meta de paquet.xml n’est pas traité correctement

  7 juin 2020, par nicod _

  == égalité avec transtypage (plus tolérante)
  === égalité stricte (même type)

  Un test avec === évite souvent des erreurs difficiles à repérer ou à anticiper.

  https://www.php.net/manual/fr/language.operators.comparison.php