[Bug 745937] New: multiqueue: enters the buffering state when the use-buffering property is set

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745937

            Bug ID: 745937
           Summary: multiqueue: enters the buffering state when the
                    use-buffering property is set
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dpalmer at digisoft.tv
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When the 'use-buffering' property is set on a multiqueue, the internal
mq->buffering variable is set to TRUE, which causes the element to enter the
buffering state, and begin emitting buffering messages, regardless of buffer
levels.

decodebin sets the use-buffering property when making a decode group active.
So, an effect of the current multiqueue behaviour is that playback may pause
unnecessarily when a decode group becomes active (the multiqueue max-size-time
property is also reduced when a decode group is made active, so this bad
behaviour is only seen when the current buffer level is smaller than the new
max-size-time value).

There is no reason I can see to set mq->buffering = TRUE when use_buffering is
set; the code here also calls update_buffering(), which will set mq->buffering
= TRUE if this is warranted because of low buffer levels.

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