[Bug 753090] basetransform: check the segment condition

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753090

Myoungsun Lee <ohmygod0327 at gmail.com> changed:

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--- Comment #10 from Myoungsun Lee <ohmygod0327 at gmail.com> ---
Created attachment 310468
  --> https://bugzilla.gnome.org/attachment.cgi?id=310468&action=edit
videodecoder: check the segment status

I found the root cause.
The decoder sends invalid buffer to downstream element, even though it doesn't
send the segment event.

Please refer to patch comment.

===========
Usually, if the element finished flushing, then it sent segment event.
And then it pushed buffer.

If videodecoder has no segment value, it means videodecoder is in flushing
status except first playing time.
Videodecoder pushed the buffer even though it doesn't have  segment value.
Therefore, videodecoder have to check the segment status.

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