The video stream goes like this: DVD(YCbCr) -> ADV7180 (8-bit ITU-R BT.656 YCrCb 4:2:2 embedded sync) -> ADV7511 -> ADV7842 or TV.
The video output of PAL 576i always right, but in the contrary NTSC 480i always has one flaw(please see attachment).
I've already checked the DVD output is correct, and the TV is OK too. Plus the TV successfully detects 480i@60Hz, which means the timing setting for ADV7511 works. So what could be the cause of NTSC display problem?