[Bug 726221] New: could not receive CAPS event in demux's sink pad.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726221
  GStreamer | gstreamer (core) | 1.2.3

           Summary: could not receive CAPS event in demux's sink pad.
    Classification: Platform
           Product: GStreamer
           Version: 1.2.3
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: zmafox at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=271689)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=271689)
details of aiurdemux plugin

I am porting gstreamer plugins from 1.0.9 to 1.2.3 and find out that demux
could not receive caps event which was send from typefind element.
I uses a universal demux(aiurdemux) and many caps are available for demux's
sink pad. Caps event should be send to the demux's sink pad to tell the file
type so that i can load the library according to the type of file.

I checked the source code and find that there is a commit to remove the caps
event and I want to know the reason because it breaks the rules of caps
negotiation. If demux would not handle the caps event, they should drop the
event themselves in event handler of sink pad.

attachment is the details of aiurdemux.

Steps to Reproduce:
gst-launch-1.0 playbin uri=file:///xxx.mp4

related commit:
gstreamer/gstreamer.git
commit 922815996f166f42a1ff148a5ef2561c97a5d973
Author: Sebastian Dröge <sebastian.droege at collabora.co.uk>
Date:   Mon Apr 29 12:39:20 2013 +0200

    typefind: Remove code that would cause caps to be sent twice

    Whenever we set typefind->caps we will also send a caps event downstream.

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