[Bug 755999] gstharness: add gst_harness_set_single_segment

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755999

--- Comment #9 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
If you add a demuxer to an already-running pipeline then it depends a bit on
the pipeline what needs to be done IMHO:

1) If demuxer input is in TIME format like from a live input (mpeg-ts or asf
over RTP; mpeg-ts-over-udp, etc.) then the demuxer should produce output
buffers on ~ the same running time line as the input buffers. So no problem.

2) If demuxer input is e.g. from a file, the demuxer will produce output
timestamps from running time 0, in which case you need to offset those manually
to the current or desired running time, otherwise the beginning or all of the
output will get dropped when synced against.

Or maybe you want to do something entirely different here and I'm just confused
because you use the same single-segment terminology but want something else
than what identity does for the same thing.

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