[Bug 710323] New: terrible framerates with ximagesrc

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=710323
  GStreamer | gst-plugins-good | 1.2.0

           Summary: terrible framerates with ximagesrc
    Classification: Platform
           Product: GStreamer
           Version: 1.2.0
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: jimmac at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


As the screen screen recording gives me 0byte files I tried to record one of my
displays, set to 1920x1200 and scaled with `xrandr --output DVI-I-1 --scale
1x0.9` with the pipeline kindly provided on #gstreamer IRC channel:

gst-launch-1.0 ximagesrc show-pointer=true startx=2560 starty=0 endx=4479
endy=1080 ! video/x-raw,framerate=30/1 ! videoconvert ! videoscale ! videorate
! vp8enc threads=12 ! webmmux name=mux ! filesink location="./video.webm"

This results in a very laggy video far from being 30fps despite my workstation
having 12 cores to chew on that. To use a less involving codec, I tried
encoding to mjpeg to little improvement. 

gst-launch-1.0 -e ximagesrc show-pointer=true startx=2560 starty=0 endx=4479
endy=1080 ! video/x-raw,framerate=30/1 ! videoconvert ! videoscale ! videorate
! queue ! jpegenc ! qtmux ! filesink location="./video.mov"

Both files attached. This is gstreamer1-plugins-good-1.2.0-1.fc20.x86_64

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