The HVX-200 shoots in DVCPro format which utilizes 4:2:2 chroma subsampling, as opposed to HDV’s 4:2:0. I’ve never seen a side by side test of keying DV vs. HDV, but i’m almost be willing to put my money on the DV, given that HDV is more compressed.
And DV is already poor source material for keying footage.
Some will say that Keylight in AE will pull a good key from DV, but I doubt that key would hold up in a myriad of compositing scenarios. Might look okay against certain tones, but it’s still going to be over-jagged, noisy, or over soft around the edges.
And honestly, not even 4:2:2 will give you perfect keys for every scenario.
So try to go with the best you have access to.
Joey Foreman
Editor/Animator
Nowhere Productions, Athens, GA