There is a black gap at the top of image when using a external Signal Generator(NTSC-M) .
However,image produced by chips(adv7282m 480P) themselves is 720x480 size is normal.
Please refer to the attached file to get detailed description.
I hope to get your help,thanks!
Hi Yuanyuan Guo,
Do you have ACE enabled?
If so your issue could be the same as the one detailed at the link below: