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Rewrite an MP4, MOV, Matroska or WebM file as MP4 with the movie header first, without re-encoding.
coreav remux INPUT OUTPUT rewrites an MP4, MOV, Matroska or WebM file as MP4 by stream copy, with the movie header first (faststart), so a player can start before the whole file has arrived.
A stream that MP4 cannot carry is dropped and listed in the summary (coreav.remux/1). For a Matroska or WebM source, a video stream that MP4 cannot carry fails the remux instead, so a video never silently becomes an audio-only file. --drop-unsupported drops it and writes the other streams.
coreav remux input.mkv output.mp4
coreav remux --streams 0,2 input.mov output.mp4
Rewrite an MP4/MOV, Matroska or WebM file as MP4 with the movie header first (faststart), without re-encoding
Usage: coreav remux [OPTIONS] <INPUT> <OUTPUT>
Arguments:
<INPUT> The file to rewrite
<OUTPUT> Where to write the MP4 file: a new file, or `-` for standard output
Options:
--streams <STREAM> Stream indexes to keep, comma separated (default: every stream MP4 can carry; for Matroska and WebM, a video stream it cannot carry fails the remux unless --drop-unsupported is given)
--fail-on-unsupported Fail instead of dropping a stream that MP4 cannot carry
--drop-unsupported Matroska and WebM sources: also drop a video stream that MP4 cannot carry (or that the allowlist leaves out), writing the other streams; by default that fails, so a video never silently becomes an audio-only file. MP4 sources drop such streams anyway
--allow <CODEC> Codecs to accept, comma separated, as for `coreav probe`
--strict Reject the whole file when a stream's codec is not allowed
--force Overwrite OUTPUT if it exists (a symbolic link is replaced, not written through; the new file keeps the old one's permissions)
-h, --help Print help