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• 360 video - FFMPEG change "zoom" for Youtube

  20 avril 2020, par Jedeme Vlakem

  I can change angle of 360 video :

  



  ffmpeg -i 15.mp4 -vf  v360=e:e:yaw=60:pitch=0:roll=0 15_exp.mp4


  



  But problem is, that I need to change "zoom" - when I use VLC player, I can roll out angle and picture is more "clean". But when I upload video to Youtube I have no option to zoom.

  



  I there any option to change view ?

  


• How to prevent screen tearing when updating stdin input to ffmpeg for youtube livestream

  8 septembre 2021, par Cameron Sima

  I am working on a livestream application that allows multiple web clients to stream video through webrtc to a 'controller' client which will add their audio track, then be able to switch between these video feeds and output the raw stream data to a server running ffmpeg, which will then send the feed to youtube live.

  


  The 'controller' client simply sets one peer video source as the 'active' stream on button press and all others as 'inactive'.

  


  The data is then sent to a node.js server like so :

  


        this.mediaSources.forEach((source, _) => {
    source.recorder.ondataavailable = (e: BlobEvent) => {
        if (source.active) {
          this.socket.emit('binarystream', e.data)
        }
      }


  


  The node server starts an ffmepg process like so :

  


  export class FfmpegService {
ffmpeg: ChildProcess
youtubeUrl = 'rtmp://a.rtmp.youtube.com/live2'

start(rtmpDestination: string) {
    this.ffmpeg = spawn('ffmpeg', this.getFfmpegOptions(rtmpDestination), 
        { shell: process.env.NODE_ENV !== 'production' }
    )
}

stop() {
    if (this.ffmpeg) {
        this.ffmpeg.stdin.end()
        this.ffmpeg.kill('SIGINT')
        this.ffmpeg = null
    }
}

feedStream(data: any) {
    this.ffmpeg.stdin.write(data)
}

private getFfmpegOptions(streamKey: string): string[] {
    const rtmpDestination = this.youtubeUrl + '/' + streamKey
    return [
        '-i','-',
        '-c:v', 'libx264', 
        '-preset', 'fast', '-tune', 'zerolatency',  // video codec config: low latency, adaptive bitrate
        '-c:a', 'aac', '-ar', '44100', '-b:a', '64k', // audio codec config: sampling frequency (11025, 22050, 44100), bitrate 64 kbits
        '-y', //force to overwrite
        '-use_wallclock_as_timestamps', '1', // used for audio sync
        '-async', '1', // used for audio sync
        //'-filter_complex', 'aresample=44100', // resample audio to 44100Hz, needed if input is not 44100
        //'-strict', 'experimental', 
        '-bufsize', '300k',
        '-pix_fmt', 'yuv420p',
        '-f', 'flv', rtmpDestination
    ];
}


  


  Everything works as expected in a youtube live session. The only problem is when switching between input streams, there is about 5 seconds of screen tearing before settling down. From all outward appearances, the switch happens immediately and seamlessly. I feel this can be attenuated/solved by tweaking the ffmpeg options but I'm pretty new to ffmpeg. I have tried increasing/decreasing -bufsize and -preset cli options, but nothing has worked so far.

  


• How to convert 1080px mp4 video to 360p,480,720px,1080 like available in Youtube via ffmpeg

  14 février 2016, par Deep dhaliwal

  This is code.. I am in doubt about "-b" what about it. What about it ? Is it correct ? Please check and give improved version

  ffmpeg -i 'input.mp4' -ab 192k -ar 44000 -r 24 -aspect 4:3 -b 899k -vcodec mpeg4 -s 640*360 'output.mp4'