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• dnn-layer-mathunary-test : add unit test for tan

  6 juin 2020, par Ting Fu

  dnn-layer-mathunary-test : add unit test for tan
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  
  Signed-off-by : Guo Yejun <yejun.guo@intel.com>
  

  • [DH] tests/dnn/dnn-layer-mathunary-test.c

• 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.

  


• using ffmpeg on youtube video url php

  29 novembre 2014, par king

  I am trying to get youtube video from its actual url and convert it into avi using ffmpeg could anyone help me in this

  <?php
  
   $video = "http://r3---sn-cxaauxax-cage.googlevideo.com/videoplayback?initcwndbps=471250&ipbits=0&itag=22&sparams=dur%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Cmime%2Cmm%2Cms%2Cmv%2Csource%2Cupn%2Cexpire&expire=1417308390&upn=mdUcarOb9uA&sver=3&mt=1417286760&mime=video%2Fmp4&fexp=3300113%2C3300113%2C3300134%2C3300134%2C3300137%2C3300137%2C3300161%2C3300161%2C3310366%2C3310366%2C3310705%2C3310705%2C3312478%2C3312478%2C900245%2C907259%2C927622%2C932404%2C937427%2C941458%2C943909%2C947209%2C948124%2C951501%2C952302%2C952605%2C952901%2C953000%2C953912%2C957103%2C957105%2C957201&mm=31&key=yt5&signature=5FBF01B3A073A5B1BCEF5FDC480420872E365766.FA2463D05DD20DFE72E4243723D76DC551A8E3F7&id=o-AG_18OU8gTru9RXONTqv_lYhbFcvoJgEzvbFUwObjNY6&dur=2825.984&mv=m&source=youtube&ms=au&ip=27.34.252.158";
  
  
  
         $num = 3;
  
         $secpos = 1;
  
       $thumb = "C:\\ffmpeg"; 
  
      echo "Starting ffmpeg...\n\n";
  
      echo shell_exec("ffmpeg -i $video -ss 90 -t 100  output.avi ");
  
      echo "Done.\n";
  
  ?>