[Bug 736819] mpegtsbase: Handle STREAM_START in PUSHING mode.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736819
  GStreamer | gst-plugins-bad | git

--- Comment #3 from Edward Hervey <bilboed at bilboed.com> 2014-10-06 14:05:23 UTC ---
Small (big) issue I noticed:
* assume the new program has one or more elementary stream PID in common with
the old one (say 0x0021) of the same type (say video),
* when we get to activating the new program ... adding the pad for that
elementary stream will fail (because there already is a pad with the same name,
in this example video_0x0021),
* the new pad doesn't get exposed... but the old one gets removed
* data goes nowhere
* sad panda

This isn't the fault of this commit, but it's exacerbated by it.

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