[Bug 793715] rtspsrc: regression with streams marked as recvonly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793715

--- Comment #11 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
One complication for heuristics here is that it is completely valid (and AFAIU
the ONVIF testsuite checks for that) to *only* have a backchannel. So if we see
a single audio stream that is recvonly (or sendonly), we can't know whether it
is a backchannel or a single audio stream.

I would suggest that for 1.14 we ignore the attributes completely unless a
backchannel is requested on rtspsrc. If a backchannel is requested, we follow
the RFC and not the broken examples in the ONVIF spec, which would then still
fail with cameras like this one here though.

For 1.16 we can hopefully come up with a better solution. I think ideally I'd
like to always look at the attributes, and if we need workarounds for broken
hardware out there we can always add a property for that.

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