[Bug 782949] matroskamux: reject H264 AVC on-the-fly codec_data changes (e.g. from rtph264depay)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782949

--- Comment #12 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Well. There is a regression in behaviour of sorts, yes.

As I see it, the commit and the resultant rtph264depay behaviour is entirely
correct.

Some may see this as a regression and may say "but it worked", but avc1 just
doesn't support this on-the-fly change and the created files are somewhat
broken.

If in doubt I'd revert the commit in the 1.12 branch for now, until we've had
time to update muxers to error out or do the right thing when caps change.

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