How modify the priority of vpdma at hdvpss module

Hi, 

I have a question about the vpdma at hdvpss module.

I used the platform of DM8167, and I want to realize the following link:

capture  VIP0 --> merge(inQue0)-->

capture  VIP1 --> merge(inQue0) --> framesOut --> hostFramesIn  hostFramesOut --> framesIn --> encode --> bitsOut --> ...

VIP0 output 2464*2096@25fps for the mjpeg encode

VIP1 output 2464*2096@25fps for the h.264 encode

However, the encoded data of jpeg and h.264 have noise as follow:

I thought it may be the priority of vpdma at hdvpss is lower, how should I modify the priority?

May be you give me some advises about the question.

Thanks