AV3 on the OSSC is not set up by default for the DTV output of the Dreamcast and other consoles; it expects typical VGA/PC resolutions unless you enable DTV 480p (and probably also adjust the other settings described by Harrumph). It also lacks the low-pass filtering that AV1 and AV2 have that the Dreamcast’s output would benefit from. AV1 is basically already set up for the Dreamcast’s output; if you have a BeharBros Toro, the easiest fix would be to connect that to the OSSC with a male-to-male SCART cable.
The GDEMU would have nothing to do with the video output, aside from forcing 480p for compatible games.
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