[Bug 743994] validate: Misc patches to fix bugs and implement small features

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743994
  GStreamer | gst-devtools | unspecified

--- Comment #3 from Thibault Saunier <tsaunier at gnome.org> 2015-02-04 14:38:39 UTC ---
Created an attachment (id=296107)
 View: https://bugzilla.gnome.org/attachment.cgi?id=296107
 Review: https://bugzilla.gnome.org/review?bug=743994&attachment=296107

validate: Wait for switch-track to complete before executing next action

This action type can take some time, we need to make sure that the
combiner/input-selector element properly pushed a buffer marked
as DISCONT to concider the action is done.

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