Hi,
In using multifilesrc, it reads the files continuously. But in using nvcamerasrc, the frames are generated in a period. The difference is like to run videotestsrc without/with is-live=1. So for multifilesrc, you read a frame, duplicate to 11 frames and read next frame right away. For nvcamerasrc, you get one frame every 33ms(30fps) and duplicate to 11 frames.