As mentioned above, a CPI file is just an information file format associated with AVCHD or MTS files and it can’t be converted to a playable MP4 video format. However, if you want to play or edit the video you recorded with a camera since camera video formats like MTS and AVCHD are not widely accepted, you can grab AVCHD or MTS video out of the dictionary and convert it to MP4. For this purpose, a video conversion tool is a necessity. WonderFox HD Video Converter Factory Pro is a professional video converter. It will help you convert MTS and AVCHD to MP4 without any quality damage. Moreover, it supports 500+ video & audio formats conversion, enables you to clip, crop, rotate, and merge videos.