[Bug 755101] validate: scenarios: sometimes failure with changing subtitle track scenarios

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755101

--- Comment #1 from Eunhae Choi <eunhae1.choi at samsung.com> ---
Created attachment 311439
  --> https://bugzilla.gnome.org/attachment.cgi?id=311439&action=edit
validate: scenarios: set need clock sync for switching subtitle track

As soon as the track is changed, the pipeline state is set to NULL by execution
'stop' action even if there is a 'playback-time' with 5sec.

If the AV sink is not synchronized, audio fakesink and video fakesink has
different position value.

When the validate request the position information of pipeline to do 'stop'
action, the audio fakesink response of the position query with the bigger value
than 5sec. It causes 'fail' of the switching subtitle track scenarios.

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