[Bug 790989] New: compositor performance regression

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790989

            Bug ID: 790989
           Summary: compositor performance regression
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I noticed that master (55823ae92b204c5e0dc326f8309b0a10b260cbb2) induces a
massive performance regression on compositor.

gst-launch-1.0 filesrc location=/dev/zero blocksize=3110400 num-buffers=900 !
rawvideoparse width=1920 height=1080 framerate=30 format=nv12 ! queue !
compositor ! "video/x-raw, format=(string)NV12, width=(int)3840,
height=(int)2160, framerate=(fraction)30, colorimetry=(string)bt709" ! fakesink
-v

Numbers below are in seconds, running the same pipeline in 1.12.3 and master

+------+------+--------+
| Csp  | 1.12 | master |
+------+------+--------+
| NV12 | 6.69 |  15.36 |
| YUY2 | 4.57 |   9.12 |
| I420 | 6.97 |  15.66 |
+------+------+--------+

I don't see any changes in the caps between the two versions, it seems to be
internal to compositor.

Might be related to https://bugzilla.gnome.org/show_bug.cgi?id=786078

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