[Bug 767921] videoscale: artifacts on still video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767921

--- Comment #4 from Ezequiel Garcia <elezegarcia at gmail.com> ---
I backported the commit into my 1.8.1 build, and the result is better. However,
a pipeline that scales YUY2 frames still produces better results than a
pipeline scaling I420.

Pipelines being used to compare:

gst-launch-1.0 -v v4l2src norm=NTSC device=/dev/video0 num-buffers=3 !
videoconvert ! video/x-raw,format=I420,width=720,height=480 ! videoscale !
video/x-raw,width=360,height=240 ! jpegenc quality=100 ! multifilesink
location=i420-%d.jpg

gst-launch-1.0 -v v4l2src norm=NTSC device=/dev/video0 num-buffers=3 !
videoconvert ! video/x-raw,format=YUY2,width=720,height=480 ! videoscale !
video/x-raw,width=360,height=240 ! jpegenc quality=100 ! multifilesink
location=yuy2-%d.jpg

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