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• Video streaming to YouTube using JavaScript and Java

  28 septembre 2020, par user1597121

  I'm trying to stream live video from a user's browser to YouTube Live. I already have the following working :

  


  

  1. Capture video from the webcam using navigator.mediaDevices.getUserMedia

  


  2. Send video data to the server via WebSocket by periodically invoking this function :

  


  


  function getFrame(video)
{
    var canvas = document.createElement('canvas');
    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    canvas.getContext('2d').drawImage(video, 0, 0);

    return canvas.toDataURL('image/png', 1);
}


  


  

  3. Creating a live broadcast and stream on YouTube via their API and receiving the RTMP info where they expect the video stream to be sent.

  


  


  This is where I seem to be stuck. I'm not sure how to send the video data from my Java server to YouTube's RTMP endpoint. I've looked into using Red5 or ffmpeg, but haven't been able to find an example where the data is continually being sent via WebSocket. Rather, there's always some "stream" that is being redirected to YouTube, coming in on a dedicated port, or perhaps from a pre-recorded video file.

  


  I have very limited knowledge of how video streaming works, so that's presumably making things more difficult than they should be. I'd really appreciate some help with getting this figured out. Thank you !

  


• Stream to youtube using Hardware Encoding

  28 août 2021, par Renan F.

  I'm currently streaming to youtube using NVIDIA hardware encoding to reduce the load on the CPU, with this code :

  


  ffmpeg -framerate 30 -f gdigrab -i desktop -f lavfi -i anullsrc -c:v h264_nvenc -f flv "rtmp://a.rtmp.youtube.com/live2/KEY"


  


  My screen resolution is 2560x1080, but this is the result i get in youtube :


  


  There are huge empty spaces on both sides, and the resolution is not so good, even selecting "HD" on youtube.

  


  I tried to specify in the last parameter before flv,
-s 2560x1080 but I could not see any difference.

  


  Also would like to ask if someone knows what -qp 0 does, I could not find it in the documentation, it does appear here :

  


  https://trac.ffmpeg.org/wiki/Capture/Desktop

  


  Under hardware encoding.

  


  Looking for any advice, taking in mind I'm trying to reduce the CPU usage and keep a normal/good resolution.

  


• Using ffmpeg to restream youtube videos

  2 juin 2020, par ILoveCake

  I want to restream 3 youtube videos (each one is a live webcam) in this way : they would run one after the other, but each one runs for only 1 minute. All this in a loop. So my live stream would eventually look like this :
cam1, cam2, cam3, cam1, cam2, cam3, ...
I have tried to used youtube-dl and ffmpeg (these are my preferred command line tools) to download each stream, let it run for 1 minute and restream it. The problem is that I have to start ffmpeg each time. So when it stops and starts again, the live stream stops and starts again (after about 15 seconds). Here is my code (for bash) :

  



  The main script : (FILE is an array with the 3 URLs for the videos)

  



  for URL in "${FILE[@]}"
do
  timeout 1m /usr/local/bin/get_livestream.sh $URL
done



  



  and get_livestream.sh :

  



  youtube-dl -q -o - -- $1 | ffmpeg -re -loglevel warning -hide_banner \&#xA;  -i - -s 960x540 -c:v libx264 -b:v 2M -c:a copy \&#xA;  -strict -2 -flags &#x2B;global_header -bsf:a aac_adtstoasc -bufsize 2100k \&#xA;  -f flv rtmp://live.twitch.tv/app/<key>&#xA;</key>