[FFmpeg-devel] [PATCH 1/2] Add option -movflags write_track_title which will write track title metadata. This is useful in conjunction with the metadata flag to specify track title, especially for workflows that are including multiple audio tracks in the same file.

[Courtland Idstrom]

Hi -

Thanks for the feedback here. I'll fix that commit message. I believe this
is the most relevant reference material regarding the userdata ('udta') tag
for Quicktime:

https://developer.apple.com/library/content/documentation/QuickTime/Reference/QTRef_AtomsResources/Content/QTRef_AtomsResources4.html#//apple_ref/doc/uid/TP40004285-DontLinkChapterID_1--udta-
https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-63839

>From my reading of this, the 'udta' atom can appear as a child of a 'trak'
atom, and can have an optional child 'name', which is how this title is
being encoded. I've also verified that this is the method by which
Quicktime will encode titles if you set them per track using their user
interface.

Thanks,
-Courtland


On Sat, Mar 17, 2018 at 6:23 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com>
wrote:

> 2018-03-17 3:26 GMT+01:00, Courtland Idstrom <cidstrom at telltalegames.com>:
> > Example:
> >   ffmpeg -i in.mov -movflags write_track_title -metadata:s:a:0
> > title="Eng-FullMix"
>
> Is this defined by the QuickTime specification?
>
> The commit message should be split so the first line
> is <80 chars.
>
> Carl Eugen
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