Free dvd authoring software no resampling

I suspect experience dictates wisdom here and I have little of the former. These are an awful lot of questions, but I'm thankful for any info. My first guess would be: downscale to 300dpi (2400px height for a 12x8 print), embed 24-bit sRGB, cross fingers. In case one can create chemical prints from digital material, does any of the above worries apply? Should I look for printer-specific profiles or use sRGB? Is Adobe RGB useless? CIELAB? Can I consult their DPI specs anywhere? Does anyone know how lab printers operate in this regard?

But since 1) I don't really know how they work, 2) I don't know their exact DPI, 3) print size options are often only approximate, I'm at a loss. So I'd like to feed them exactly the pixels they need, or at least an approximate number if they do have some tolerance. Now the problem is I worry that lab printers may have a specific pixel count for a given size, and will either up- or downscale any photo that doesn't have the exact dimensions. I mean, I'd like to do all the processing myself, and then just have the photo lab print them. My question is, once I prepare them for printing, I wouldn't want them to be further resampled in the photo lab. In fact they are above the effective resolving power of the scanner, and the film itself, so they can be shrunk without loss of detail, if done properly.

This sometimes includes a number of pixels that can/should be cropped out.

I mean quite large, up to 10344*6888, 48 bits per pixel.

Free dvd authoring software no resampling