This spike was WORK IN PROGRESS and is UNSUPPORTED.

My idea is to make use of the MediaStream Recording API to stream desktop or mobile video on the fly to the HTTP Live Streaming format, for other terminals to consume.
The server receives the webm files, converts them to mpegts files, updates the playlist.m3u8 and hosts all these correctly, live.

I'm using MediaStreamRecorder to polyfill the MediaStream Recording API, capturing video/webm 10 second files to the server.
The ffmpeg toolset is used to do the video processing heavy-lifting tasks (probing video info and webm to mpegts conversion).

NOTE: For capturing purposes, Google Chrome only captures video, while Firefox captures both video and audio.

How to install

FFMPEG on Mac OSX

brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libcaca --with-libquvi --with-libvidstab --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-openssl --with-opus --with-rtmpdump --with-speex --with-theora --with-tools --with-x265

FFMPEG on Ubuntu Linux

(I tried to log these steps the best I could but didn't start from a clean ubuntu distro so if you find additional/incorrect info, please let me know)

get up-to-date additional dependencies

sudo add-apt-repository ppa:mc3man/trusty-media

sudo apt-get update

sudo apt-get dist-upgrade

sudo apt-get install faac libde265 libquvi-dev libvncserver-dev libvpx-dev x264 x265 libass-dev libfdk-aac-dev libcaca-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libopus-dev librtmp-dev libtheora-dev libvorbis-dev libvo-aacenc-dev libvo-amrwbenc-dev libwebp-dev libx265-dev

we will now compile ffmpeg from source

wget https://www.ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2

tar xf ffmpeg-snapshot.tar.bz2

cd ffmpeg

./configure --enable-version3 --enable-gpl --enable-nonfree --enable-shared --enable-libcaca --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libquvi --enable-librtmp --enable-libtheora --enable-libv4l2 --enable-libvo-aacenc --enable-libvorbis --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-x11grab --disable-avutil

make

sudo make install

Additional dependencies

npm install

How to use

node serve.js &

in the browser, visit http://<host>:8001

accept video and mic sharing notification

press start

after the first chunk is sent and processed (in 10-15 seconds) you'll be able to use the URL: http://<host>:8001/videos/<hash>/playlist.m3u8 on a browser video player, ffplay|vlc|mplayer...
During live recording, the playlist returns only the last N chunks on purpose.

When you press stop the last chunk is marked as last and the playlist gets closed, so the whole recording can be replayed later.

Besides capturing webms and converting to HLS, the server also serves video files correctly (with ranged request support and correct mime types for mp4, webm, m3u8 and ts files).

TODO

improve page.html

• display recording time
• hide irrelevant buttons
• improve dimensions
• if possible, display stream optionally

m3u8 integrity

m3u8 almost perfect

ffprobe -v quiet -show_entries format=start_time,duration <file>.ts

start_time accumulation logic not clear

https://trac.ffmpeg.org/ticket/3353

firefox problem

sent files not correctly processed (ffprobe returns no duration!!!)

multi-profile

• generate index playlist (listing profile playlists)
• generate multiple profile mpegts files at once
• update multiple playlists

Example ffmpeg commands

ffprobe -v quiet -print_format json -show_format -show_streams j6cffc_0.ts

ffmpeg -i j6cffc_0.webm -vcodec libx264 -acodec libfaac -r 25 -profile:v baseline -b:v 800k -b:a 48k -f mpegts -y j6cffc_0.ts

HLS NOTES

Sample HLS files:

• http://www.flashls.org/playlists/test_001/stream.m3u8
• http://www.flashls.org/playlists/test_001/stream_1000k_48k_640x360.m3u8
• http://www.flashls.org/playlists/test_001/stream_1000k_48k_640x360_000.ts

Spec notes

• EXT-X-TARGETDURATION http://tools.ietf.org/html/draft-pantos-http-live-streaming-13#section-3.4.2
• EXT-X-ALLOW-CACHE http://www.wowza.com/forums/content.php?496-How-to-control-Apple-HLS-client-caching-%28EXT-X-ALLOW-CACHE%29
• EXTINF http://tools.ietf.org/html/draft-pantos-http-live-streaming-13#section-3.3.2
• EXT-X-ENDLIST - if ommitted, player assumes live and keeps fetching playlist