[Bug 703378] New: pbutils: recent caps description patch can mistakenly confuse different formats

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703378
  GStreamer | gst-plugins-base | git

           Summary: pbutils: recent caps description patch can mistakenly
                    confuse different formats
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I pushed this patch:

http://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=065f1603b0f1d2adc8477bf1f3ebe2b154885d89

The intent is to allow describing non fixed caps if they represent the same
format, but as others pointed out, a single media type may represent different
formats (eg, audio/mpeg). So this patch is too loose. Filing so the patch may
be reverted if no good solution can be found.

For context, my test case is getting caps from gupnp-dlna restrictions. These
are not fixed, and I pass them as profiles to encodebin. If encodebin can not
find elements to satisfy the profile, those caps will be passed through the
description/missing-plugin code.

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