[gstreamer-bugs] [Bug 571813] New: playbin2 doesn't forward tags to custom audio-sink

[GStreamer (bugzilla.gnome.org)]

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=571813

  GStreamer | gst-plugins-base | Ver: 0.10.22
           Summary: playbin2 doesn't forward tags to custom audio-sink
           Product: GStreamer
           Version: 0.10.22
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: artfwo at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.25/2.26
   GNOME milestone: Unspecified


According to the GStreamer docs, it is possible to create container elements
that look like a sink to playbin, but in reality contain a number of custom
elements linked together. This is achieved by making a GstBin, containing a
DSP-chain with a ghost pad.

But if I create a Bin which contains an "rgvolume" element, that modifies audio
output level based on received TAG events, it doesn't work in playbin2. (But
works with the classic playbin).

Other events/downstream messages probably are not forwarded as well.

I'm attaching a (python) test application to this bug. If "playbin2" at line 45
is replaced with "playbin", the volume is normalized as expected: there's a
different sound level and a proper "target-gain" value is printed to the
console.


-- 
See http://bugzilla.gnome.org/page.cgi?id=email.html for more info about why you received
this email, why you can't respond via email, how to stop receiving
emails (or reduce the number you receive), and how to contact someone
if you are having problems with the system.

You can add comments to this bug at http://bugzilla.gnome.org/show_bug.cgi?id=571813.