[Bug 769048] qtmux: prores-related fixes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769048

Vivia Nikolaidou <vivia at ahiru.eu> changed:

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--- Comment #5 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 334015
  --> https://bugzilla.gnome.org/attachment.cgi?id=334015&action=edit
0001-qtmux-Write-additional-atoms-for-prores-video.patch

New patches attached. Please review and feedback.

There is no information on the caps about whether the interlaced content is TFF
or BFF. I added a custom top-fields-first boolean which means that all prores
encoders will have to provide this field. Currently this information is on each
frame and not on the caps, which might be a bit late in our case (or at least,
make the implementation more complicated). If you have a better idea, please
let me know.

Note that, on the libav side, there's no work done yet for top vs bottom fields
first, we just assume it's TFF until there's a final decision on how to handle
this.

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