[Bug 635701] rtspsrc: seeking is broken

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=635701

--- Comment #40 from Heinrich Fink <hfink at toolsonair.com> ---
I have been testing a bit with with slomo today. Failing in this context means
that simply playing the stream with gst-play-1.0 will drop a large amount of
frames constantly (i.e. it stutters heavily). 

A few other remarks:

- Using a machine with more CPU cores will make the problem worse (e.g. we
tested on a 12-core Xeon, limiting the number of CPU cores via taskset for the
test-launch process makes the problem go away)

- It only happens with gst-play-1.0 of GST HEAD, i.e. running test-launch with
slomo's test arguments above and a gst-play-1.0 from 1.4.5 stable, will not
drop any frames.

- When running test-launch and gst-play-1.0 on separate machines, different
timing through network latency might hide the race condition, although I
haven't tried using lower framerates on separate machines (which makes the
problem worse in general). So for reproducing this issue, I'd recommend running
server/client on the same machine.

Reverting gst-plugins-base back to d54d51d (just before this bug's commit)
makes the problem go away for me as well.

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