i have a sony HD camcorder and i'm trying to edit videos but i need to convert my mts file to mpwg2 so it doesn't lag and i also lost the converting cs given by sony. do u know any site where i can download a converter.thanks

Google "remuxts" .... top link will be a Japanese site,but if you scroll down you'll see a green link in English to the remuxts zip file.

This is a tiny, free program that losslessly remuxes transport streams to mpeg2 program streams - very fast.

Might look here: mts converter - mts file converter, mts conversion (http://www.mtsconverter.org/)
or just google "mts file converter," there are a bunch of listings / Battle Vaughan/miamiherald.com video team

$39 though (versus free)