Grey glitch on several frames

[martync]

Hi,

I'm using your lib for a while now and I can't solve this issue.
When there's a big mouvement, there's a grey frame surrounding a part of the rendered image.
I've played with every argument of the deepflow command with no result.
I guess it's more relevant to the deepflow discussion group but I was wondering if anyone has a clue of what's going on here. An exemple : http://i.imgur.com/C5tBiew.jpg

My image resolution is 1280 × 720