How to convert cpi and mpl files?

Apparently my canon hg20 avchd camcorder has all these weird files I’ve neer heard of.

Mpl, cpi and mts. I’ve tried avs video converter, prism and neither work. Prism will only convert mts files and the playback is extremely choppy.

Does anyone know of a free video converter that handles mpl and cpi files specifically?