The problem is that the DVD is not on input A, it is on the video input. Try changing the input on the projector. Input A is for component video but the receiver is sending composite video.
The whole thing is also a mess and not wired right. There are audio outputs going to video inputs...
To really diagnose this we would need to see the connections on the projector and the DVD player. But first I would plug in the video feed on the DVD input. In the one picture it looks like it's hanging out a little.
Brian