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• Simple Question About Subprocess popen + screen +ffmpeg + youtube-dl

  2 juin 2021, par El_Barto_404

  ffmpeg -i "$(youtube-dl -x -g "https://youtu.be/xhXq9BNndhw")" -f s16le -ac 2 -ar 48000 -acodec pcm_s16le input.raw


  


  can anyone put this inside a popen process after a screen -S Convert ?

  


  I tried already with ' ', with commas.. but nothing

  


  I built a bot on telegram which if you send :

  


  .mandala youtubelink


  


  it takes the link and converts the video from YouTube into a uncompressed file, I need it for a music bot which streams those uncompressed files.

  


  if I run in console :

  


  ffmpeg -i "$(youtube-dl -x -g "https://youtu.be/xhXq9BNndhw")" -f s16le -ac 2 -ar 48000 -acodec pcm_s16le input.raw 


  


  it works but when I try with screen and popen it doesn't.. why ?

  


  @helper.register(pattern=r'.mandala (.+)')
async def mu2342sicbfffffffot(e):
    cheater = e.pattern_match.group(1)
    cheat = cheater
    myorder2224 = ''' "$(youtube-dl -x -g "{}")" '''
    doit = (myorder2224.format(cheater))

    ###  I already try to format the variable 
    ###  and put doit after -i and 
    ###  everything was in '' and commas 
    ###  like 'ffmpeg', 'i*, doit, '-f'...
    ###  and so on but nothing.. but nope doesn't work.

    p = subprocess.call(['screen','-S','onveter',' ffmpeg -i "$(youtube-dl -x -g "https://www.youtube.com/watch?v=Sw5HQbYGoCA")" -f s16le -ac 1 -acodec pcm_s16le -ar 96k  input.pcm'],shell=True)
  await helper.control_panel.send_message(config.chat, "La sto a manna")
  time.sleep(14)
  


  


  I REPEAT ONE MORE TIME :
HOW CAN I USE THAT FFMPEG COMMAND INSIDE A POPEN SUBPROCESS AFTER A Screen -S Convert ?

  


  IF SOMEONE WANT TO KNOW WHY :
Because I want to convert youTube videos to file .raw / .pcm

  


• Node JS partial video streaming to safari

  12 juin 2021, par Thor Bilsby

  I'm trying to stream a video directly to a browser using node.js as the backend. I would like the video to be streamed from a specific time and would also like it to be partially streamed since it is a pretty large file. Right now I am doing this with fluent-ffmpeg, like this :

  


  const ffmpeg = require('fluent-ffmpeg');

app.get('/clock/', (req, res) => {
  const videoPath = 'video.mp4'; 
  const now = new Date();

  ffmpeg(videoPath)
    .videoCodec('libx264')
    .withAudioCodec('aac')
    .setStartTime(`${(now.getHours() - 10) % 24}:${now.getMinutes() - 1}:${now.getSeconds()}`)
    .format('mp4')
    .outputOptions(['-frag_duration 100','-movflags frag_keyframe+faststart','-pix_fmt yuv420p'])
    .on('end', () => {
      console.log("File has been converted succesfully");
    })
    .on('error', (err) => {
      if (err.message.toLowerCase().includes('output stream closed')) return;
      console.log('An error occoured', err);
    })
    .pipe(res, { end: true });
});


  


  This will work with Chrome, but Safari just doesn't want to stream it.
I know that the reason why it doesn't work on Safari is that Safari needs the range header. I've therefore tried to do that, but :

  


  

  1. I can't get it to work with fluent-ffmpeg.

  


  2. When I try to do it the "normal" way, without fluent-ffmpeg, it needs to load the whole video file before it plays.

  


  


  The video doesn't need to start at the specific timestamp. It would be nice tho, but I have a workaround for that if it's not possible :)

  


  So my question is : How can I get the code above to work with Safari. And if that is impossible : How can I code something that doesn't need to be loaded fully, before it can be played in Safari browsers, aka. partial video streaming.

  


• Put images on video with ffmpeg in Node.js

  27 juin 2022, par Cery

  I am creating a server-side video renderer in node.js. I need to add images on an existing video file every frame. I need to set the specific position of each frame in the rendered video. I am holding all the frames of the images in Readable. This is my code that works, but does not take into account the position of the images. How can I modify it ? Of course I have a list with images coordinates - but I don't know how to make a filter out of this.

  


  this.stream is a list of images.

  


    const filter = ["[1:v]format=argb,setpts=PTS+" + 0 + "/TB[out]",
        {
            filter: "overlay",
            options: {
                enable: "between(t," + 0 + "," + 9 + ")",
                x: "0",
                y: "0",
            },
            inputs: "[0:v][out]",
            outputs: "tmp",
        }

        ]
        const Options = [
            "-crf 16",
            "-f mp4",
            "-vcodec libx264",
            "-movflags frag_keyframe+empty_moov",
            "-pix_fmt yuv420p",
        ];

        var ffmpeg = require('fluent-ffmpeg');
        ffmpeg.setFfmpegPath(ffm.path);
        var command = ffmpeg();

        const outputStream = fs.createWriteStream(this.Path + "test.mp4");

        command.input(this.Path + "input.mp4");
        command.input(this.stream).inputFPS(23);
        command.outputOptions(Options);
        command.fps(23);

        command.complexFilter(filter, "tmp");

        command.output(outputStream);