Reply To: Xbox compatibility issue with HDTV

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July 17, 2020 at 5:19 PM #39875
Zacabeb
Participant

    The optimal sample rate depends on whether each specific game runs at 640×480 or 720×480. In the former case, the optimal setting is 780 samples per line, and in the latter it’s the standard 858 samples per line (the picture is ever so slightly wider than 4:3 in that case).

    If you’re using Line2x mode with 480p and have Allow upsample2x enabled, the difference between those two sample rates gets less pronounced. Finding out whether a specific game runs at 640×480 or 720×480 requires some pixel peeping or detective work.

    Edit
    Here are the timings for square pixel 640×480 on the Xbox:

    H. samplerate: 780
    H. synclen: 58
    H. backporch: 59
    H. active: 640
    V. synclen: 6
    V. backporch: 32
    V. active: 240

    Take note if the picture appears shifted vertically. If so, reduce V. backporch to 31 or 30.