Moritz Barsnick <barsnick <at> gmx.net> writes:
> > For mov, it will report "major_brand: qt", for
> > mp4 it should be "major_brand: isom".
>
> Ah, so ffmpeg does translate the atomic differences
> into differing reports? I just noticed: ffprobe too
> can display this as "TAG:major_brand=" ("-show_format").
I wouldn't say "translate". The files (mov, mp4 etc.)
start with a "ftyp" atom and (I believe) the
specifications call the content of the atom "major
brand". At least qt, isom, mp42 exist, they are all
compatible when reading, but need different handling
when writing, that's why different muxers but only
one demuxer exists.
Carl Eugen
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