[Bug 790000] rtph264depay: doesn't update resolution if format is avc

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790000

--- Comment #28 from Olivier Crête <olivier.crete at ocrete.ca> ---
(In reply to Jan Schmidt from comment #26)
> If you renumber SPS/PPS, you also need to change every packet that contains
> a reference to the SPS and PPS ids. In any case, that's not how AVC in mp4
> works - it's quite OK to change SPS/PPS on the fly, but the muxer needs to
> append a new configuration section and avcC entry, and change the STSD entry
> for the samples so the correct SPS/PPS will be activated when that happens.
> 
> qtmux doesn't implement that, but qtdemux does - see
> gst_qtdemux_stream_check_and_change_stsd_index() in qtdemux.c.

That seems much easier, so we should implement that in qtmux I think. My
knowledtge of the isobff format is quite limited. I wonder what we can do for
flvmux (ie what do Flash & YouTube support) and what about Matroska?

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