[Bug 778812] New: GAP events don't unblock a pipeline

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778812

            Bug ID: 778812
           Summary: GAP events don't unblock a pipeline
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: velorums at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 346044
  --> https://bugzilla.gnome.org/attachment.cgi?id=346044&action=edit
Pygi script to mux live kate subtitle stream into ogg

Live subtitles are generated in appsrc and passed to oggmux along with an audio
from audiotestsrc.

File stays empty.

I expect it to be filling with audio.

The appsrc in the example script generates GAP event at its need-data handler.
Logs show that oggmux gets it, but all threads remain blocked. Also tried:
queues everywhere, GAP buffers instead of events, sending some real text
buffers and then GAPs (it locks up when I stop generating buffers).

Note: there is a large probability that I'm doing something wrong.

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