#1 dv_decode_full_frame with alpha

[Sun Silver]

HI,

I am developing a non linear video editor based on DV.
Many effects require an alpha channel. It would save a
significant amount of time if dv_decode_full_frame
would support decoding to an rgb or yuv colorspace
including an alpha channel. Equally good would be to
just give the number of channels per pixel. If this
defaults to 3, decode to rgb would behave like usual
and if it is set to 4 it would leave a byte after each
set of three bytes.

Cheers, Rolf