[gstreamer-bugs] [Bug 614296] New: [basetransform] Try suggestion on bad pad alloc

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=614296
  GStreamer | gstreamer (core) | git

           Summary: [basetransform] Try suggestion on bad pad alloc
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: thiago.sousa.santos at collabora.co.uk
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=157415)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=157415)
Test toy app

When basetransform gets a pad alloc with a caps it doesn't support it simply
rejects with not-negotiated. When dynamically switching pipeline elements,
upstream might issue a pad_alloc to a basetransform element that was just added
and linked in place of another element. This pad_alloc will probably have the
same caps that was being used with the previous element and might not be
supported by the newly added basetransform.

I propose that basetransform instead of failing, suggested upstream a caps that
they could agree and keep the pipeline flowing.

I'll attach a test case in python.

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