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• Different brightness merging multiple BMP files into MP4 using ffmpeg

  14 février 2023, par jamana

  I want to edit a small video frame/image by image without losing quality (or without losing much of it). I have used ffmpeg to split into images using the following line :

  


  ffmpeg -i test.mp4 $filename%%03d.bmp

  


  This worked fine. I tried merging the images back using several lines including :

  


  ffmpeg -re -f image2 -framerate 30 -i $filename%%03d.bmp -c:v prores_aw -pix_fmt yuv422p10le test.mkv

  


  Though, this results in a difference between brightness/contast between original and merged videos. The merged file would be a bit darker (you have to look close) than original file. What can I do to fix this ?

  


  Thanks for your time.

  


• How do I transform python AudioSegment extraction to an ffmpeg command ?

  22 mars 2021, par Alexis Wilke

  I have a python script which loads an MP4 file and saves the audio to an OGG file like so :

  


  movie = AudioSegment.from_file(f"movie.mp4", format="mp4")
movie.export(f"audio.ogg", format="ogg")


  


  I want to extract that to a bash script which will run once at the we create our Debian packages. To do so, I prefer bash and no python. Is the following command equivalent ?

  


  ffmpeg -i movie.mp4 -vn audio.ogg


  


  It seems to work (the audio sounds the same), but I wanted to make sure that it was as close as possible to the original conversion. The resulting files can't just be compared apparently.

  


• FFmpeg child process closed, code null, signal SIGSEGV

  22 novembre 2022, par AMRITESH GUPTA

  I have been working on a project where I am trying to get users' audio and video and stream it to youtube live. I tested my code on my windows machine, and everything is working fine, but when I deploy my server code on Heroku, I get this error FFmpeg child process closed, code null, signal SIGSEGV.

  


  I used https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest.git for Heroku buildpack.

  


  Code snippet :

  


  const inputSettings = ['-i', '-', '-v', 'error'];

const youtubeSettings = () => {
    
    return [
        // video codec config: low latency, adaptive bitrate
        '-c:v',
        'libx264',
        '-preset',
        'veryfast',
        '-tune',
        'zerolatency',
        '-g:v',
        '60',
  
        // audio codec config: sampling frequency (11025, 22050, 44100), bitrate 64 kbits
        '-c:a',
        'aac',
        '-strict',
        '-2',
        '-ar',
        '44100',
        '-b:a',
        '64k',
  
        //force to overwrite
        '-y',
  
        // used for audio sync
        '-use_wallclock_as_timestamps',
        '1',
        '-async',
        '1',
  
        '-f',
        'flv',
        youtubeURL,
      ]
    
}

const ffmpegInput = inputSettings.concat(youtubeSettings());


io.on('connection', (socket) => {
    console.log(`socket connected to ${socket.id}`)
    
    try{

    const ffmpg = child_process.spawn('ffmpeg',ffmpegInput)

    ffmpg.on('close', (code, signal) => {
        console.log(
          'FFmpeg child process closed, code ' + code + ', signal ' + signal
        );
        // ws.terminate()
      })

    ffmpg.stdin.on('error', (e) => {
        console.log('FFmpeg STDIN Error', e)
    })

    // FFmpeg outputs all of its messages to STDERR.  Let's log them to the console.
    ffmpg.stderr.on('data', (data) => {
        console.log('FFmpeg STDERR:', data.toString());
    })

    socket.on('message', (msg) => {
        console.log('DATA', msg)
        ffmpg.stdin.write(msg);
    })

    // If the client disconnects, stop FFmpeg.
    socket.conn.on('close', (e) => {
        console.log('kill: SIGINT')
        ffmpg.kill('SIGINT')
    })
}
catch(err){
    console.log(err);
}


  


  Heroku logs