I am looking for the possibility to produce a two channel video output with a Raspberry Pi 3. That is, a device that splits the HDMI signal, ideally coming from full HD resolution, into two output signals of half width, e.g. 960 x 1080 or 960 x whatever. This can be VGA no problem. To repeat, I produce one regular video output signal, the image is composed of two halves, left and right, and I want the left to go to one monitor and the right to go to another monitor.
So I see there are machines like the Matrox DualHead2Go, but that box has DisplayPort input and says it requires a Windows box. It also says it appears as a 3840 x 1200 device which probably is not supported on the Pi, and I would need a lower resolution.
Has anyone experience with scenario, is there any machine (as cheap as possible) that can perform such a task and works fine with Raspbian and the Pi?