[Bug 762793] taginject does not copy the tag list it sends, so changes by other elements are propagated later

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762793

--- Comment #3 from Sjors Gielen <gnome-bugzilla at sjor.sg> ---
Created attachment 322574
  --> https://bugzilla.gnome.org/attachment.cgi?id=322574&action=edit
Test case

Test case. Contains compilation instructions. It requires any foo.mp3 in the
same directory to play, or just change the source. As said, this is a test case
that requires GStreamer Editing Services, but the actual bug is in GStreamer
(probably plugins-good), I just didn't succeed in writing a pure GStreamer test
case.

I'll shortly describe what this test case does for those not familiar with GES:

* It initializes GStreamer and GES
* It plays a GES_TYPE_TEST_CLIP, which is equivalent to GstAudioTestSrc, for 6
seconds, and right after that another for 6 seconds
* It opens foo.mp3 and plays it for 20 seconds
* It adds "taginject tags=\"..\" ! rgvolume" to the foo.mp3 clip
* At this point, a GstAudioTestSrc and foo.mp3 are playing at the same time
* At the moment the GstAudioTestSrc stops, at T+6 seconds, NLE rebuilds the
pipeline causing the taginject!rgvolume bug described here.

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