html5 - Encoding FFMPEG to MPEG-DASH – or WebM with Keyframe Clusters – for MediaSource API -

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i'm sending video stream chrome, play via mediasource api.

as understand it, mediasource supports mp4 files encoded mpeg-dash, or webm files have clusters beginning keyframes (otherwise raises error: media segment did not begin keyframe).

is there way encode in mpeg-dash or keyframed webm formats ffmpeg in real-time?

edit:

i tried ffmpeg ... -f webm -vcodec vp8 -g 1 every frame keyframe. not ideal solution. work mediastream though. way sync segments keyframes in webm not every frame needs keyframe?

reference questions on webm / mp4 , mediasource:

media source api not working custom webm file (chrome version 23.0.1271.97 m)

mediasource api , mp4

at moment ffmpeg not support dash encoding. can segment ffmpeg (https://www.ffmpeg.org/ffmpeg-formats.html#segment_002c-stream_005fsegment_002c-ssegment), recommend combining ffmpeg , mp4box. use ffmpeg transcode live video, , mp4box segment , create .mpd index.

mp4box part of gpac (http://gpac.wp.mines-telecom.fr/).

here example using h264:

ffmpeg -threads 4 -f v4l2 -i  /dev/video0 -acodec libfaac -ar 44100 -ab 128k -ac 2 -vcodec libx264 -r 30 -s 1280x720  -f mp4 -y "$movie" > temp1.mp4 && mp4box -dash 10000 -frag 1000 -rap "$movie"

if need vp8 (webm), use: -vcodec libvpx , -f webm or -f ts.


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