[Bug 766172] New: v4l2videodec: [Regressions] Should not fail if S_FMT(CAPTURE) fail after STREAMON(CAPTURE)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766172

            Bug ID: 766172
           Summary: v4l2videodec: [Regressions] Should not fail if
                    S_FMT(CAPTURE) fail after STREAMON(CAPTURE)
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

As we added output format negotiation recently, we simply used
gst_v4l2_object_set_format() to try and set the negotiated format. This cause a
regression if the driver does not support this because this function post an
error on the bus directly. In fact, it's not mandatory, most decoder have a
single output format. We still want to call S_FMT, as some driver (buggy ?)
won't work if you don't expliclty call S_FMT on the CAPTURE side.

In future rework, I would rather split the element handling from the V4L2
handling completely, so we can avoid this kind of issues.

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