Reallusion products can only render mp4 files at 30 fps, if you need any other frame rate then you can use png image sequences or uncompressed avi files - these will not give you a smaller file size. For example a 3 second full HD avi file is just over 340MB, the same 3 seconds rendered as mp4 is only 8,5MB and a full HD png frame from an image sequence is around 3MB, a one second image sequence - 25 frames - works out at 75MB, or about 4,5GB per minute.
You could render an uncompressed avi at 25 fps and then use a video converter to output an mp4 file with a reduced bitrate that would keep the file smaller, but don't go too low or the video will look like crap.
System: Win 10 Pro (1803), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver 417.35), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.
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