[Bug 797321] qtmux: Add option to create a timecode trak in non-mov flavors

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797321

--- Comment #1 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 374001
  --> https://bugzilla.gnome.org/attachment.cgi?id=374001&action=edit
qtmux: Add option to create a timecode trak in non-mov flavors

Even if timecode trak is officially unsupported in non-mov flavors,
some software still supports it, e.g. Final Cut Pro X:

https://developer.apple.com/library/archive/technotes/tn2174/_index.html

The user might still expect to see the timecode information in the
non-mov file despite it being officially unsupported , because other
software e.g. QuickTime will create a timecode trak even in mp4 files.
Furthermore, software that supports timecode trak in non-mov flavors
will also display the file duration in "timecode units" instead of real
clock time, which is not necessarily the same for 29.97 fps and friends.
This might confuse users, who see a different duration for the same
framerate and amount of frames depending on whether the container is mp4
or mov.

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