[Bug 764629] qtdemux: Support sidx based seek in pull mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764629

--- Comment #9 from Seungha Yang <sh.yang at lge.com> ---
(In reply to Tim-Philipp Müller from comment #8)
> Maybe something like CFF/Ultraviolet? (Although I've never seen sidx in
> those, and if I remember correctly tfra is mandatory there, but it could be
> similar)

- Actually, tfra and sidx have very similar structure but sidx have some
sophisticated additional info. 

- ISO/IEC 14496-12 document said tfra is not mandatory if my understanding is
correct

Definition
Box Type:    ‘tfra’
Container:    Movie Fragment Random Access Box (‘mfra’)
Mandatory:    No
Quantity:    Zero or one per track
Each entry contains the location and the presentation time of the random
accessible sample. It indicates that the sample in the entry can be random
accessed. Note that not every random accessible sample in the track needs to be
listed in the table.
The absence of this box does not mean that all the samples are sync samples.
Random access information in the ‘trun’, ‘traf’ and ‘trex’ shall be set
appropriately regardless of the presence of this box.

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