As you asked me I am going to start a new thread for ADV7403.
I am working on sending the 480P on 656 10/8 bits.
I have used these settings for ADV7842 with 480p progressive component input and 10bit 656 output, and it worked.
0x40 reg(0x03)=0x01 //output 10 bit SDR
0x40 reg(0x19)=0xC0 //double the LLC frequency
here is the link to the conversation
Right now I need to have the same setting "480p progressive component input and 10bit 656 output" on ADV7403, I have looked into the datasheet but it looks that this is a different die. Would you please send me the script for this mode on ADV7403.