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• Building A livestreaming server like youtube from scratch

  9 décembre 2022, par Dipo Ahmed

  I am trying to build a live streaming server like youtube where I can watch the video live or if I want to I can play the video from any duration I want.

  


  What I have tried so far.
I have built a node js WebSocket server where I push the video blob that I receive from the browser via MediaRecorder API every 2 seconds. This blob is then getting converted to hls by a ffmpeg process which generates 2 seconds *.ts files and a .m3u8 file which I am playing with video.js in browser.

  


  This is my ffmpeg command

  


   spawn('ffmpeg', [
        '-i', '-',
        // '-re',
        '-fflags', '+igndts',

        '-vcodec', 'h264',
        '-acodec', 'aac',

        '-preset', 'slow',
        '-crf', '22',
        // You can also use QP value to adjust output stream quality, e.g.: 
        // '-qp', '0',
        // You can also specify output target bitrate directly, e.g.:
        '-b:v', '1500K',
        '-b:a', '128K', // Audio bitrate

        '-f', 'hls',
        '-hls_time', '1',
        // '-hls_playlist_type', 'vod',
        '-hls_list_size', '2',
        '-hls_flags', 'independent_segments',
        '-hls_segment_type', 'mpegts',
        '-hls_segment_filename', `${path}/stream%02d.ts`, `${path}/stream.m3u8`,
    ]);


  


  The problem is that the video js player duration is not updating like in youtube where the video duration increases every second.

  


  Any direction will be appreciated. Please tell me if my approach is wrong and what needs to be learned for me to build this system.

  


• Added wmode=transparent to YouTube example link.

  14 juin 2011, par Jack Moore

  m example1/index.html m example2/index.html m example3/index.html m example4/index.html m example5/index.html Added wmode=transparent to YouTube example link.

• Streaming windows desktop to Youtube with ffmpeg [closed]

  23 mai 2021, par rarahim

  I've been spending days trying to stream my live desktop to Youtube using ffmpeg. There are too many questions and answers on SO about this topic but none really works for me, or perhaps because working with ffmpeg is non-trivial task with it's never ending list of available options.

  


  So far, what sort of works for me is using the following (which is a mixture of what was gathered from various sources) :

  


  


  ffmpeg -threads:v 2 -threads:a 8 -filter_threads 2 -thread_queue_size
5096 -f dshow -i video="screen-capture-recorder" -f dshow -i
audio="Stereo Mix (Realtek High Definition Audio)" -pix_fmt yuv420p
-c:v libx264 -qp:v 19 -profile:v high -rc:v cbr_ld_hq -level:v 4.2 -r:v 60 -g:v 120 -bf:v 3 -refs:v 16 -f flv rtmp ://a.rtmp.youtube.com/live2/KEY

  


  


  My questions are :

  


  


  1. how do i only stream video ? i do not want to stream audio, simply removing '-f dshow -i audio="Stereo Mix (Realtek High Definition Audio)"' causes it to fail

     


  


  2. after a while, ffmpeg starts to hog my memory causing my system to slow down terribly, what causes this and how can i fix it ?

     


  


  3. my video feed when viewed from Youtube keeps buffering rather frequently, how can this be fixed/improved ?

     


  


  


  Thanks.

  


  UPDATE :
I've managed to somewhat figure out a workaround for these issues. Not sure if these are the right solutions but they work for now.

  


  


  1. Youtube apparently requires streams to have audio component. So instead of just removing the audio device form the options, i had to put in "-f lavfi -i anullsrc" to use null audio device.

     


  


  2. The memory hog issue was improved by adding "-framerate 10" and "-r 10" to the input and output options, this reduces target frame rate to 10fps.

     


  


  3. The overall stream performance seem to be indirectly improved by doing the above actions.

     


  


  


  So finally the working simplified version of my ffmpeg command is :

  


  


  ffmpeg -framerate 10 -f dshow -i video="screen-capture-recorder" -f
lavfi -i anullsrc -vcodec libx264 -preset:v ultrafast -pix_fmt yuv420p
-f flv -r 10 rtmp ://a.rtmp.youtube.com/live2/KEY

  


  


  I'm updating here in case it might be useful to someone at some point in the future.