[Bug 767921] videoscale: artifacts on still video

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Wim Taymans <wim.taymans at gmail.com> ---
please check if this fixes it:

commit 5e752f4edad15cb090608f45c10161398ba58fee
Author: Wim Taymans <wtaymans at redhat.com>
Date:   Wed Jun 22 16:02:37 2016 +0200

    video-converter: fix interlaced scaling some more

    Fix problem with the line cache where it would forget the first line in
    the cache in some cases.
    Keep as much backlog as we have taps. This generally works better and we
    could do even better by calculating the overlap in all taps.
    Allocated enough lines for the line cache.
    Use only half the number of taps for the interlaced lines because we
    only have half the number of lines.
    The pixel shift should be relative to the new output pixel size so scale
    it.
    Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=767921

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