[Bug 774030] New: postproc: return GST_FLOW_FLUSHING during flushing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774030

            Bug ID: 774030
           Summary: postproc: return  GST_FLOW_FLUSHING during flushing
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Currently, when gst_pad_push fails it always return GST_FLOW_ERROR.
I found this could lead to deadlock during seek, which happens very unusually.
I don't know why it returns same error value, but IMO, it should be modified.

@Victor, with the media you downloaded from me last week, you can reproduce
deadloc.
Just play it and seek repidly several times.

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