[FFmpeg-user] moov atom way too big + udta added

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed Jun 19 16:38:28 EEST 2019

Am Mo., 17. Juni 2019 um 11:09 Uhr schrieb Mayescid Ocomance
<MayescidOcomance at gmail.com>:

> >> The file is fine, however, when I compare its structure using
> >> AtomicParsley to a file with the same specifics but created
> >> by another programm, I'm getting way too big moov atoms,
> >> which seems to be caused by way too big stscm, stszm,
> >> stco, (and ctts for audio) atoms in both streams.
> >How do you define "too big"?
> The files themselves are fine and work well. However, the basically same
> files are created by another programm with up to 5 times smaller moov atoms.

> The bigger moov atoms don't seem to add any advantage so their size seems
> to be redundantly big.

How do you know?

> Either I need help spotting the advantages or I'd like some help reducing
> the moov atom size in order to save data space.

Could you elaborate on the numbers a bit?
You write above that the moov atoms are five times bigger but what does
that mean for the overall file size?

Carl Eugen

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