Created attachment 371117 [details] [review]
parsebin: Post STREAM_COLLECTION on EVENT_STREAM_COLLECTION

Otherwise decodebin won't get notified about STREAM_COLLECTION comming
from the sources and thus will never get informored about it. Without
being informed about the stream collection decodebin won't be able to
select any streams. It ends up not creating any output for the streams
defined from outside parserbin.

To reproduce the issue you can get the element propose on https://bugzilla.gnome.org/show_bug.cgi?id=795366 and run

    gst-launch-1.0 playbin3 uri=test://video+audio

The testsrc element will:

 * Create streams for each of its pads and make sure those are used in the stream-start event
 * Push a STREAM_COLLECTION on each of its sinkpad before pushing the caps

Without the patch from here, decodebin will never link the pad from testsrc (down the line).

commit 89d0e9cc92a86aa0227ee87406737b6d31670aea (HEAD -> master, origin/master, origin/HEAD)
Author: Thibault Saunier <tsaunier@igalia.com>
Date:   Wed Apr 18 16:06:07 2018 -0300

    parsebin: Post STREAM_COLLECTION on EVENT_STREAM_COLLECTION

    Otherwise decodebin won't get notified about STREAM_COLLECTION comming
    from the sources and thus will never get informored about it. Without
    being informed about the stream collection decodebin won't be able to
    select any streams. It ends up not creating any output for the streams
    defined from outside parserbin.

    https://bugzilla.gnome.org/show_bug.cgi?id=795364

This needs more thinking.

Did you do more thinking yet?

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