Actually all of the Aspect Ratio functions in the OSD do
something. They obviously don't do what you want. For example, if you are playing a 2.35:1 movie, and crop it to 2.35:1, you won't actually see any change because the movie is already in 2.35:1 format. There is some information in the
Wiki but it looks a bit out of date. It will give you a bit of an idea though.
What I observed when playing a movie that has an Aspect Ratio of 2.35:1 (with no actual black bars encoded in the movie, but with black no-video areas above and below the video), using the OSD Aspect ratio settings was;
Stretch: The width is preserved and the height is stretched to fill the display. (When playing a 4:3 video that fills the height of the screen, this settings stretches in horizontally instead of vertically.)
Crop: Does exactly what you want. Maintains the aspect ratio of the image, stretches it vertically to fill the screen, crops the left and right side of the video to allow this change.
Crop Black Bars 1.85: Does the same as Crop. I would have expected this to do something different, but it wouldn't be useful, so maybe doing nothing is the correct thing.
Crop Black Bars 2.35:1: Displays the movie in the original aspect ration of 2.35:1, filling the screen horizontally, with "black bars" (non-video areas) top and bottom.
Crop Black Bars 2.40:1:Squashes the video vertically slightly, increasing the size of the black bars a little. This seems like the correct thing to do.
Crop Edges: Crops a bit of video from the left and right, and stretches it vertically to maintain the original aspect ratio.
So, if your movie truly has an Aspect ratio of 2.35:1, then the Crop setting should do what you want. It works for me.
If your movie actually has an Aspect Ratio of 16:9, and has black bars included in the video above and below the image, the madVR settings to detect and remove Black Bars should work. You will need to understand what all those settings do though, and check the correct ones.
It sounds like your movies are in fact in 2.35:1 aspect ratio, and not 16:9 with black bars top and bottom. If the Crop setting isn't doing what you want, then you should use the zoom function as you tried already, and zoom the movie until it fills the vertical height of the screen. That amount of zoom will be saved in the [Playback Info] tag so that for future showings the movie will fill the screen on playback, with the left and right sections pushed off the screen (cropped). I believe that is what you want.