Ios set it to 1080p, the file is huge for 25 minutes video.
Filmic Pro has many many options too, one of the best video camera apps for iOS in my book.
They must have changed it or there is only so much they can limit on the newer phones.The lowest is 960*540, also I don't know what's iframe mean.
Try ProCam
1080, 720, 640x480 or 480x360