[gstreamer-bugs] [Bug 580133] New: Regression in baseparse since last release

GStreamer (bugzilla.gnome.org) bugzilla-daemon at bugzilla.gnome.org
Fri Apr 24 09:01:39 PDT 2009

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  GStreamer | gst-plugins-bad | Ver: git
           Summary: Regression in baseparse since last release
           Product: GStreamer
           Version: git
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: thaytan at mad.scientist.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified

Commit ad2c7bffe7d94c79184904b14101cbc93eeb9ebd breaks the unit tests.

If I interpret the problem correctly, the old logic sent a newsegment, and then
flushed any data in the adapter (presumably because it comes from the old

The new logic flushes the adapter whenever there is a pending newsegment event,
but doesn't send the newsegment until there is a complete frame. This leaves it
in a state where until there is a single input buffer containing a full frame,
the parser continuously flushes the adapter (containing part of a frame), and
never pushes the newsegment event.

See gstbaseparse.c:886 for the offending gst_adapter_clear() code.

I would guess that the fix is to move the gst_adapter_clear() to a better
location, possibly when the pending newsegment event is enqueued in the first
place - as presumably any data after then comes from the new segment and needs
to be separated from the old, incomplete, frames.

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