[Bug 675189] [0.11] [matroskademux] Send gap event for subtitle streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=675189
  GStreamer | gst-plugins-good | 0.11.x

--- Comment #4 from Matej Knopp <matej.knopp at gmail.com> 2012-06-19 05:39:10 UTC ---
Guys, this one is actually more important than it seems (possibly applies for
other muxers as well), not sending gap event causes the pipeline to stall.

Decodebin will not block the subtitle stream on sticky events (because doing
that would possible block the stream before allocation query, which is
serialized now), so caps and segment event will not block the GstDecodePad.

source_pad_blocked_cb in gstdecodebin2 needs a non-sticky event or data to
trigger the blocking.

Otherwise, if the subtitle pad does not get blocked, other pads will not get
exposed.

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