[Bug 757892] rtph264pay: send PPS/SPS before every key frame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757892

--- Comment #13 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Let's move the discussion whether to and under what circumstances to enable
this by default into a different/future bug. I just mentioned that this was my
goal because this might/should inform the API decision.

Nicolas, in many cases (RTSP, SDP, etc.) PPS/SPS are transmitted out of band
and do not have to be resent ever. The existing mode 0 is for that.

I think the functionality that this patch tries to add makes a lot of sense and
is desirable to have, even if not used by default yet.

I also think the API proposed (special value G_MAXUINT/-1) makes sense and it's
the one I had in mind as well.

I think we should push this in some form (but leave the current default as is).

I'd like to see the property description changed a little perhaps, to say "send
with every keyframe" or such instead of "send always", I think that's easier to
understand.

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