[Libav-user] NV21 -> NV21 libswscale drops UV plane

[Ignas Brašiškis]

Hello I am tryng to use libswscale to scale NV21 resolution. While it seems
working it just converts single plane, other is zero. Is it a bug, or do I
need specify something?
I tested in these types of conversion:
NV21-> No Scale (just call to sws_scale) -> NV21
Camera YUV -> NV21 -> No scale (just call to sws_scale) -> NV21 -> YUV420P
-> display
And result is the same. Sws_scale Function drops UV plane (I pass Y and UV
planes).
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