MTS files can be generated by popular cameras like the Panasonic HMC-80 and sometimes they don’t import with sound into Adobe premiere Pro.
Enter a free application called Smart Converter.
This thing not only rocks because it’s completely free, but it’s lightning fast.
A 30 second MTS clip can be converted in literally 3 seconds. That’s fast!
SmartConverter is a great tool for MTS to Pretty-Much-Anything file conversion.
It maintained my HMC-80 footage with no additional visible artifacts or significant change in file size (tens of MB).