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• Streaming a programatically created video to youtube using node and ffmpeg

  23 septembre 2020, par Caltrop

  I've been trying to Livestream a programmatically created image to youtube using node. I've had very limited success using FFmpeg. While I have managed to create and save an image thanks to this insightful thread, I have yet to make the code work for streaming to an RTMP server.

  


  const cp = require('child_process'),
    destination = 'rtmp://a.rtmp.youtube.com/live2/[redacted]', //stream token redacted
    proc = cp.spawn('./ffmpeg/bin/ffmpeg.exe', [
        '-f', 'rawvideo',
        '-pix_fmt', 'rgb24',
        '-s', '426x240',
        '-i', '-', //allow us to insert a buffer through stdin
        '-f', 'flv',
        destination
    ]);

proc.stderr.pipe(process.stdout);

(function loop() {
    setTimeout(loop, 1000 / 30); //run loop at 30 fps
    const data = Array.from({length: 426 * 240 * 4}, () => ~~(Math.random() * 0xff)); //create array with random data
    proc.stdin.write(Buffer.from(data)); //convert array to buffer and send it to ffmpeg
})();


  


  When running this code no errors appear and everything appears to be working, however, YouTube reports that no data is being received. Does anybody know what is going wrong here ?

  


  Update : This is really counter-intuitive but adding a slash to the destination like this 'rtmp://a.rtmp.youtube.com/live2/[redacted]/' causes ffmpeg to throw a generic I/O error. This is really weird to me. Apologies if the answer to this is obvious, I'm really inexperienced with ffmpeg.

  


• Evolution #3841 : Augmenter la taille du cache par défaut (image)

  19 octobre 2016, par b b

  D’accord pour le premier point, je passe presque toujours le cache (pas celui des images) à 100Mo sur mes sites en prod. Reste à discuter pour valider que cela n’aurait pas d’effet de bord contre productif.

  Pour le deuxième point je ne comprends pas, c’est déjà le cas non ?

• How can I split a series of clips from a video and then stitch them together without audio or video gaps ?

  16 avril 2020, par Dr. Cyber Sec

  I'm developing an application where I take a video and (1) split it up into a bunch of 1 second chunks. Then, I need to (2) stitch a subset of those chunks back together, resulting in a slice of the original video.

  



  For example, let's say I have an original, 10s clip. I split it up into 1s chunks for each second (a clip from 0s to 1s, a clip from 1s to 2s, etc.). I now need to stitch, say, seconds 2-4 together into one video.

  



  I'm currently attempting both steps using ffmpeg.

  



  For clip-cutting :

  



  ffmpeg -ss 33 -i video.ts -t 1 33to34.ts


  



  This should seek to second 33 and output a 1s clip duration, yielding a video clip containing seconds 33-34 of the original video. I noticed that ffmpeg doesn't always seek accurately, so after following the instructions in this post, which says to manually add keyframes to the parts of the video you want to cut, I tried this :

  



  First, setting the keyframes :

  



  ffmpeg -i video.ts -force_key_frames 00:00:01.000,00:00:02.000,00:00:03.000,00:00:04.000 out.ts


  



  And then cutting the clips as I did before with the new output clip.

  



  While this did get the videos to be exactly 1s long each, (which I wanted) there is a small gap (just a slight jitter) in audio when I combine the clips back together. I cannot have this, and am looking for a solution.

  



  Can anyone help me understand why this is happening and help me find a solution ? Thank you so much in advance.