Composite video output

Hi, my first post here. I'm using my raspberry to display video from thermal camera onto my cars navigation screen, the problem is that i need composite video in 320x192 format. My question is it reasonably possible to display composite video in non-standard resolutions from raspberry pi? I mean i can change it in raspi-config, but resolution is set to 720x480@60i for NTSC, 720x576@50i for PAL, also i tried one of those HDMI2AV but they are 1280x720 or some standard resolution. Are there any add-ons for raspberry to output video in specific resolution?

The info your asking about is badly documented and sketchy. So I guess your best option is to use a search engine and try.

ok, hoped that someone found solution for this problem but i understand and probably try to display it in default resolution in visable part of the the screen

thanks for clarifying my thoughts