[Bug 761545] New: playbin: caps negotiation with sink is broken

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761545

            Bug ID: 761545
           Summary: playbin: caps negotiation with sink is broken
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: rawoul at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 320420
  --> https://bugzilla.gnome.org/attachment.cgi?id=320420&action=edit
playbin log when failing

I think patch 1.7.1-31-g844aa3e introduced a regression WRT caps negotation in
playbin.

I have an audio sink who can accept MPEG-4 AAC audio, but not all profiles (for
example AAC-ELD is not supported). So I have the following caps template:
"audio/mpeg, mpegversion = (int) { 2, 4 }, framed = (boolean) true"

and a custom accept_caps function which checks the stream-format and codec_data
fields, possibly rejecting some unsupported combinations.

Since the commit above, a software decoder is not plugged anymore as fallback.

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