Converting Sony AVCHD .mts to useable format for HitFilm
I recently bought a Sony FDR-AX100 and it records an .mts file. I've searched this forum and tried a few different conversion programs. VirtualDub was suggested but when I tried to open the file it wouldn't allow me to select an mts file. I then tried ClipToolz and converted it to the suggested DNxHD which took the file from 441mb to almost 4gb. When I import it into HitFilm, nothing appears in the thumbnail or in the trimmer.
When I first played with HitFilm Express yesterday and used the demo files provided for Portal Combat which were mp4s, they played fine and I could scrub in the trimmer without any issues. I've converted some of my clips to mp4 and they stutter when I try to scrub through. I've converted my clips to the Portal Combat mp4 clip that doesn't stutter (using properties) and they supposedly match - both 24 bit color, AVC / H.264 codec.
Can someone please give me some suggestions on how to convert these mts files to a format that I can scrub through in HitFilm without stuttering and still have good quality? Thanks!