This is rather useless a setting if implemented this way.
It is not what i had asked for.
The cams are still cropping to 21:9, image is still being lost. Stretching the cropped image is just removing the letterboxing and distorts the image.
The point to having 16:9 on Tele and Rear is to capture the full frame with no cut off. The tele cam most importantly needs full frame field of view.
Having the front wide angle cam cropped to 21:9 is beneficial to remove static dash and excessive sky.
I had asked, a few times i believe, if there is a technological reason as to why each cam can not have its own set ratio setting.
I gather, since each cam does not have its own cpu/encoder etc, the main front cam has a single cpu encoder, and can only encode at one master setting for its inputs.
Encoding each channel with independent settings, might require multiple encoders, or multi threaded processing.
However, VIOFO was able to modify the video metadata to set the other cams ratio to 16:9, but it still is applying the 21:9 crop...so something is messed up with that.
I can tell with my rear cam, it is being cropped in 21:9, as it cuts off my rear wiper, same as when i set it in all cams to 21:9. In the all cams to 16:9, it shows.