The stripes or the animation?
What I did was, I was looking at a layer style for photoshop that had a basic plain stripe pattern on it, and then I put it on a new layer above where Im working and made the fill 0% so all you see is the pattern and change the transparency and blend mode as needed etc, and clipping mask so it's in the right places and all.
Then I duplicated that layer and moved it so it was next to the first one, and then merged them into one stripe layer.
For the animation I just moved that layer over 1 nudge per 0 second frame.
But looking at your stripes makes me think I can make them a little bit more dynamic perhaps. Iunno what I'm just rambling and inspired!
Sorry if you don't use photoshop and it doesn't make any sense to you