Audio + Canvas2D/HTML recording
using RecordRTC and ffmpeg!

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1. This demo uses HTML2Canvas Library along with RecordRTC to record/encode HTML snapshots (webp images) in WebM container.
2. It also uses RecordRTC to record audio in WAV container.
3. Then it uses ffmpeg-asm.js to transcode and merge both WAV/WebM in single MP4 container.

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