Ivor Hewitt wrote:

In that case I don't understand the bob logic for the PutImage calls. The
adjustments to the y position affect the destination position not the source.
The logic appears to only make sense where dest resolution is the same as the
source resolution, I can't see how it could/would work otherwise....

For example say the source fields are vertically interleaved frames A and B:-
ABABAB

which is scaled (badly) to the destination say to:-
ABBABBAB

My belief is that, at least for the nVidia XvMC driver, scaling takes place after it pulls the fields apart. If it were open source we could find out for sure :-(

-Doug

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