[Bug 785211] New: gst-validate: considers as a failure if decoder changes width, height or framerate.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785211

            Bug ID: 785211
           Summary: gst-validate: considers as a failure if decoder
                    changes width, height or framerate.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-devtools
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 356087
  --> https://bugzilla.gnome.org/attachment.cgi?id=356087&action=edit
mpeg2 sample

Reproduce step:
gst-validate-1.0 filesrc location=sony-ct1.mpeg ! mpegvideoparse !
avdec_mpeg2video ! fakesink

It results in:
=== Got criticals. Return value set to 18 ====
     Critical error Field width from setcaps caps 'video/x-raw,
format=(string)I420, width=(int)352, height=(int)224,
interlace-mode=(string)mixed, multiview-mode=(string)mono,
multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono,
pixel-aspect-ratio=(fraction)4/3, chroma-site=(string)mpeg2,
colorimetry=(string)bt601, framerate=(fraction)30/1' is different from expected
value in caps 'pending-fields, width=(int)120, height=(int)120,
framerate=(fraction)30/1, pixel-aspect-ratio=(fraction)4/3;'

Because decoder changes resolution of src caps with real encoded size and set
them to output_state and seems gst-validate considers this as a failure.

I got same result with other vp9 files using vp9dec.

I'm wondering if this is real failure.

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