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• FFMPEG does HTTP range request only once (HTML5 MediaStream/WebM)

  17 décembre 2018, par Youssef Gamil

  The Issue

  I am trying to pass HTML5 MediaStream coming from a browser’s webcam to a Socket.IO namespace which is buffered and be accessible to FFMPEG through HTTP endpoint in form of HTTP partial/range requests. Although, it works on perfectly on Firefox/Chrome.

  Here, I have wrapped a sample and pushed it to a GitHub repo

  Environment

  • FireFox or Chrome (but not Safari)
  • Node & NPM

  Install

  • npm i from the project directory

  Run

  • npm start : to start the express server
  • Open http://localhost:3000 in Firefox or Chrome, and accept the webcam access dialog.
  • npm run ffmpeg -i http://localhost:3000/view output.webm : TODO : this doesn’t output the full stream
    • http://localhost:3000/view will be visible once it was opened in Firefox/Chrome and they’ll keep requesting till the end of stream or server down.
    • note, npm run ffmpeg ... is a just a shortcut to ffmpeg executable dependency which should be installed at startup in node_modules/@ffmpeg-installer/linux-x64/ffmpeg (which may differ depending on your OS)

  FFMPEG Log

  What I get after running ffmpeg -v trace -i http://localhost:3000/view -y tmp.mp4 :

  Reading option '-v' ... matched as option 'v' (set logging level) with argument 'trace'.
  
  Reading option '-i' ... matched as input url with argument 'http://localhost:3000/view'.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option 'tmp.mp4' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument trace.
  
  Applying option y (overwrite output files) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url http://localhost:3000/view.
  
  Successfully parsed a group of options.
  
  Opening an input file: http://localhost:3000/view.
  
  [NULL @ 0x65f1c40] Opening 'http://localhost:3000/view' for reading
  
  [http @ 0x65f2540] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'
  
  [tcp @ 0x65f4000] Original list of addresses:
  
  [tcp @ 0x65f4000] Address 127.0.0.1 port 3000
  
  [tcp @ 0x65f4000] Interleaved list of addresses:
  
  [tcp @ 0x65f4000] Address 127.0.0.1 port 3000
  
  [tcp @ 0x65f4000] Starting connection attempt to 127.0.0.1 port 3000
  
  [tcp @ 0x65f4000] Successfully connected to 127.0.0.1 port 3000
  
  [http @ 0x65f2540] request: GET /view HTTP/1.1
  
  User-Agent: Lavf/58.18.104
  
  Accept: */*
  
  Range: bytes=0-
  
  Connection: close
  
  Host: localhost:3000
  
  Icy-MetaData: 1
  
  
  
  
  
  [http @ 0x65f2540] header='HTTP/1.1 206 Partial Content'
  
  [http @ 0x65f2540] http_code=206
  
  [http @ 0x65f2540] header='X-Powered-By: Express'
  
  [http @ 0x65f2540] header='Access-Control-Allow-Origin: *'
  
  [http @ 0x65f2540] header='Content-Range: bytes 0-1391616/1073741824'
  
  [http @ 0x65f2540] header='Accept-Ranges: bytes'
  
  [http @ 0x65f2540] header='Content-Length: 1391616'
  
  [http @ 0x65f2540] header='Connection: close'
  
  [http @ 0x65f2540] header='Content-Type: video/webm'
  
  [http @ 0x65f2540] header='Date: Mon, 17 Dec 2018 10:15:14 GMT'
  
  [http @ 0x65f2540] header=''
  
  Probing matroska,webm score:100 size:2048
  
  Probing mp3 score:1 size:2048
  
  [matroska,webm @ 0x65f1c40] Format matroska,webm probed with size=2048 and score=100
  
  st:0 removing common factor 1000000 from timebase
  
  st:1 removing common factor 1000000 from timebase
  
  [matroska,webm @ 0x65f1c40] Before avformat_find_stream_info() pos: 317 bytes read:3837 seeks:0 nb_streams:2
  
  [matroska,webm @ 0x65f1c40] All info found
  
  [matroska,webm @ 0x65f1c40] rfps: 29.750000 0.016025
  
  [matroska,webm @ 0x65f1c40] rfps: 29.833333 0.013167
  
  [matroska,webm @ 0x65f1c40] rfps: 29.916667 0.012378
  
  [matroska,webm @ 0x65f1c40] rfps: 30.000000 0.013659
  
  [matroska,webm @ 0x65f1c40] rfps: 29.970030 0.012960
  
  [matroska,webm @ 0x65f1c40] stream 0: start_time: 0.000 duration: -9223372036854776.000
  
  [matroska,webm @ 0x65f1c40] stream 1: start_time: -0.001 duration: -9223372036854776.000
  
  [matroska,webm @ 0x65f1c40] format: start_time: -0.001 duration: -9223372036854.775 bitrate=0 kb/s
  
  [matroska,webm @ 0x65f1c40] After avformat_find_stream_info() pos: 467388 bytes read:469955 seeks:0 frames:115
  
  Input #0, matroska,webm, from 'http://localhost:3000/view':
  
    Metadata:
  
      encoder         : QTmuxingAppLibWebM-0.0.1
  
    Duration: N/A, start: -0.001000, bitrate: N/A
  
      Stream #0:0(eng), 41, 1/1000: Video: vp8, 1 reference frame, yuv420p(progressive), 640x480, 0/1, SAR 1:1 DAR 4:3, 1k tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng), 74, 1/1000: Audio: opus, 48000 Hz, stereo, fltp, delay 312 (default)
  
  Successfully opened the file.
  
  Parsing a group of options: output url tmp.mp4.

• avformat/http: simplify chained_options copying

  15 novembre 2014, par Michael Niedermayer

  avformat/http: simplify chained_options copying
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/http.c

• avformat/http: support auto reconnect

  12 mars 2015, par Zhang Rui

  avformat/http: support auto reconnect
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/http.c