Greetings,
I'm using the GBS-C for 240p passthrough, RGBHV converting to YPbPr output. Source is a Dreamcast outputting the grid pattern from 240p test suite. Part of the right side of the image is being cut off by the GBS-C (see image below). If I use the "Picture Control" "Move Picture" feature in the GBS settings, I can move the image to the left but it exposes a green band artifact instead of the expected rest of the grid image. If I play with the "HS shift" function in the "Development" tab, I can move the whole thing, including the green part, from left to right, so that doesn't help.
Any help would be greatly appreciated! In the meantime I can try other means of horizontally shifting the image before it hits the GBS-C as a workaround
In passthrough mode almost no adjustments can be made. I suspect the gbs is misidentifying the pixel clock from the Dreamcast.
Update: By first transcoding the signal to YPbPr and then passing into the GBS, the image displays correctly. So the issue seems specific to inputting RGBHV 240p via the 15-pin/DSUB input and attempting the passthrough+transcode. I've also observed a similar issue trying to downscale RGBHV 480p to YPbPr 240p; the downscaled output is horizontally offset and can't be de-cropped on the one side.
TLDR; don't use the RGBHV input for passthrough+transcode or downscale+transcode, instead transcode before the GBS and use the component input.