The DVDO ultra only deinterlaces, it can’t upscale. It’s feeded with 576i, from a PAL PS2, and it outputs 576p.
If I chain the dvdo to OSSC, through AV3, it treats 576p as 625p and outputs 800×600@50hz (I think it should be 640×480@50Hz).
Pressing the info button, it shows:
That must be a bug.