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• Extract just the audio link from a youtube video without converting

  19 janvier 2017, par kamron shaw

  I know there are hundreds of sites to convert youtube video to mp3. Most of them do it by first downloading the video and then converting it to mp3(or any other audio format) on their server using youtube-dl, ffmpeg or similar programs.

  What I want to know is, is there any way I can just extract the audio link for any youtube video ? I don’t know if it’s possible but I saw a couple of websites doing it .

  First Website : Openaisearch.com
  This website simply gives a download link for the audio(getting it from youtube videos). I searched for a song and saw the download url, it looked something like this :

  https://redirector.googlevideo.com/videoplayback?source=youtube&requiressl=yes&clen=3814013&upn=dzwY9aUVYME&lmt=1469875393441562&expire=1484854959&mime=audio%2Fmp4&nh=IgpwcjAxLnNlYTA5Kg01Mi45NS4yMTYuMTAy&itag=140........... 

  I believe that this is not done by first downloading and converting the video to audio format(Correct me if I am wrong).
  Although the file which gets downloaded after using this link is without any extension, but adding ".m4a" at the end of downloaded file does the work.

  Second Website : http://keepvid.com/ ?url=https ://www.youtube.com/watch?v=PT2_F-1esPk

  Again similar website with similar audio link. You can check by visiting the URL and see link of audio files.

  Any idea how these websites get that "googlevideo.com" link ? Do they scrap the youtube video links or something ?

  Thanks.

• webm live input to HLS live output

  15 avril 2021, par Lewis Tyler

  I have ben struggling with this for quite some time ; Essentially what I'm trying to do is broadcast my webcam from within the Browser to Ffmpeg on the server to convert into a .m3u8 HLS live stream. But I am having a few problems with video playback I initially thought it was CORS and cross origin headers however now I am thinking its to do with the way I'm trying to encode the media.

  


  I did a ffprobe on the input this was the response ;

  


  SERVER:key destination set to:1618380585-6666-863686008-4444-21
FFMPEG:Input #0, matroska,webm, from 'pipe:':
  Metadata:
    encoder         : Chrome
  Duration: 
FFMPEG:N/A, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
    Stream #0:1(eng): Video: h264 (Constrained Baseline), yuv420p, 640x480, SAR 1:1 DAR 4:3, 30.30 fps, 30 tbr, 1k tbn, 60 tbc (default)


  


  I am wondering if someone could help with the ffmpeg parameters ; I am currently using the following ;

  


      var ops=[
        '-r', '17',
        '-i','-',
        '-strict', '-2',
        '-vf', 'scale=w=1280:h=720:force_original_aspect_ratio=decrease',
        '-c:a', 'aac',
        '-ar', '48000',
        '-b:a', '128k',
        '-c:v', 'h264',
        '-profile:v', 'main',
        '-crf', '20',
        '-g', '48',
        '-keyint_min', '48',
        '-sc_threshold', '0',
        '-hls_time', '4',       
        '-hls_segment_filename', '/var/www/html/streams/segments/streamKey-date-%02d.ts',
        '-hls_base_url', '/streams/segments/',
        '/var/www/html/streams/streamKey.m3u8'
    ];


  


  I have also run into other problems and I was also wondering if i needed to build ffmpeg differently ; here is the current build I am running ; I only wonder this becuase when i try to add the -hls_playlist_type live parameter I get a response of not found.

  


  ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...


  


  EDIT

  


  I have also included an example .m3u8

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:5.647056,
/streams/segments/1618380585-6666-863686008-4444-21-668-00.ts
#EXTINF:2.823533,
/streams/segments/1618380585-6666-863686008-4444-21-668-01.ts
#EXTINF:5.647056,
/streams/segments/1618380585-6666-863686008-4444-21-668-02.ts
#EXTINF:0.294122,
/streams/segments/1618380585-6666-863686008-4444-21-668-03.ts
#EXT-X-ENDLIST


  


• How to setup live video stream from webcam to the server, and then beyond ? [closed]

  15 mai 2020, par Parth Sarthi

  I have an application, that is written in Node and Nuxt, to host online exams. My clients are now demanding youtube like livestream for their students. I can't use WebRTC because there will be thousands of students watching the live video, so I don't think teacher's bandwidth will be able to deliver that.

  



  Now I want to know what other options do I have ? How do I send video stream from teacher's laptop to the server in real time ? I am assuming getUserMedia ? Then how do I convert the live stream incoming from the teacher into something like HLS ? I am assuming ffmpeg ? but what commands will do that actually ? cause i can't seem to find any which will take in Media Stream and convert it into HLS. And lastly how do I server it back to the students.

  



  I have already setup the live chat for every classroom with socket.io so I am stuck here.