Where are possible framesizes documented? I noticed QVGA and VGA work, but not HVGA.
Only those are supported, for anything else you have to use set_window/window
// Override standard resolutions
csi->resolution[OMV_CSI_FRAMESIZE_HD][0] = 1280;
csi->resolution[OMV_CSI_FRAMESIZE_HD][1] = 800;
csi->resolution[OMV_CSI_FRAMESIZE_VGA][0] = 640;
csi->resolution[OMV_CSI_FRAMESIZE_VGA][1] = 400;
csi->resolution[OMV_CSI_FRAMESIZE_QVGA][0] = 320;
csi->resolution[OMV_CSI_FRAMESIZE_QVGA][1] = 200;