gst-plugins-base: videoconvert: prevent bad interlaced conversions

[Sebastian Dröge]

On Fr, 2013-03-22 at 17:24 -0700, David Schleef wrote:
> Module: gst-plugins-base
> Branch: master
> Commit: adc9694ed70870549fc8f4a6257f3b132ea31733
> URL:    http://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=adc9694ed70870549fc8f4a6257f3b132ea31733
> 
> Author: David Schleef <ds at schleef.org>
> Date:   Fri Mar  8 14:49:31 2013 -0800
> 
> videoconvert: prevent bad interlaced conversions
> 
> Don't allow conversion that changes vertical subsampling if video
> is interlaced.

This breaks backwards compatibility though... as previously videoconvert
could convert between any color formats in any case.

What's wrong with changing the subsampling of interlaced video by
changing it for each field separately (and e.g. not taking the average
value of components from different fields) and then interleaving the
fields again?
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