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• Anomalie #2486 (Nouveau) : Charge du processeur après validation d’un document

  11 janvier 2012, par Steven Mouret

  Sous Spip 3.0.0-beta2 [18874] Windows 7 Firefox 9.0.1 Lorsque je modifie un document (image) dans un article, une fenêtre modale s’ouvre et me permet de faire mes modifications. Lors de l’enregistrement mon processeur s’emballe et monte à 95% d’utilisation. Cela doit venir d’un script qui tourne (...)

• FFmpeg capturing 1 FPS thumbnails

  30 juin 2019, par Gediminas

  I’m trying to programmatically export a series of thumbnail images (one image per-second) I’m not worried about the actual footage conversion and image file creation. My interest is in how would it be better to capture a valid 1 fps frame. (with no artifacts)

  This is possible using FFmpeg’s command line like this :

  ffmpeg -i test.mp4 -vf fps=1 out%d.png

  So while looking at the FFmpeg’s source code I’ve noticed that it’s using a thing called filters. While filters can do a lot of cool stuff, I’m not sure if using those wouldn’t be too much of an overhead for a relatively simple task like this ?

  I mean, while using filters, to get a correctly decoded frame (with no artifacts) FFmpeg still needs to decode all frames contiguously anyway ? So maybe in my situation it’s better to not use filters and decode frames contiguously while monitoring frame’s PTS ?

• Fluent-ffmpeg : Output with label 'screen0' doesnot exist in any diferent filter graph, or was already used elsewhere

  28 avril 2019, par mandaputtra

  I’m trying to take video frame by frame using fluent-ffmpeg, to create video masking and some kin of like experiment video editor. But when I do that by screenshots it says ffmpeg exited with code 1: Output with label 'screen0' does not exist in any defined filter graph, or was already used elsewhere.

  Here example array that I use for producing timestamps. ["0.019528","0.05226","0.102188","0.13635","0.152138","0.186013","0.236149" ...]

  // read json file that contains timestaps, array
  
  fs.readFile(`${config.videoProc}/timestamp/1.json`, 'utf8', async (err, data) => {
  
    if (err) throw new Error(err.message);
  
    const timestamp = JSON.parse(data);
  
    // screenshot happens here
  
    // loop till there is nothing on array...
  
    function takeFrame() {
  
      command.input(`${config.publicPath}/static/video/1.mp4`)
  
        .on('error', error => console.log(error.message))
  
        .on('end', () => {
  
          if (timestamp.length > 0) {
  
            // screenshot again ...
  
            takeFrame();
  
          } else {
  
            console.log('Process ended');
  
          }
  
        })
  
        .noAudio()
  
        .screenshots({
  
          timestamps: timestamp.splice(0, 100),
  
          filename: '%i.png',
  
          folder: '../video/img',
  
          size: '320x240',
  
        });
  
    }
  
    // call the function
  
    takeFrame();
  
  });

  My expected result are, I can genereta all the 600 screenshot. on one video. but the actual result is this error ffmpeg exited with code 1: Output with label 'screen0' does not exist in any defined filter graph, or was already used elsewhere and only 100 screen generated.

  [UPDATE]

  using -filter_complex as mentioned in here doenst work.

  ffmpeg exited with code 1: Error initializing complex filters.
  
  Invalid argument

  [UPDATE]

  command line arg :

  ffmpeg -ss 0.019528 -i D:\Latihan\video-cms-core\public/static/video/1.mp4 -y -filter_complex scale=w=320:h=240[size0];[size0]split=1[screen0] -an -vframes 1 -map [screen0] ..\video\img\1.png