Composes with the on-chain engine, frames it, records picture and
music to one file.
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One loop is —s, so the file is that times the loop count
and cuts on the bar. Recording plays in real time; leave the tab in front, a
background tab throttles the capture.
MP4 out, H.264 and AAC, ready to upload. No conversion step. Nothing is
saved until you ask — the take appears in a player and you choose
download, or share it straight into another app on a phone.
If a platform ever refuses the file, remux it — this rewrites the container
only and does not touch the picture or the sound: ffmpeg -i in.mp4 -c copy -movflags +faststart out.mp4