FFmpeg
A complete, cross-platform solution to record, convert and stream audio and video.
# Converting video and audio has never been so easy.
$ ffmpeg -i input.mp4 output.avi
https://www.ffmpeg.org/favicon.ico
WebRTC
https://www.youtube.com/watch?v=p2HzZkd2A40
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UDP
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VP8 / VP9 (不支持 H.265)