I'm editing scenes shot on a Sony handycam and downloaded to my hard drive in mpg format. When the scenes are imported they play fine, but any scenes that I try to edit (e.g. cutting to remove unwanted parts) become corrupted - they get jerky as if some frames part way through the retained section have been removed and a few frames from the (removed) start of the scene get attached to the end of it in a few seconds 'loop'. I can go back and cut out the end loop, but the remainder is still corrupted.
It doesn't seem to happen with some older video in avi (I think) format from a digital (tape) video camera, so I assume it has something to do with the format being mpg.
The video is shot in DVD quality (PAL 720x576, 25 fps, stereo), not HD, and I don't believe it is a lack of hardware power because I'm using a 3rd gen quad core i7 3610QM with 8MB ram and a 2GB Invidia GT650M video card (and previously have had no such problems with video editing on a laptop with much lower specs, though not with mpg files).
Operating system is Windows Home Premium 64bit and I'm using Movie Edit Pro 18 MX Plus download version (version 11.0.6.4 (UDC2)).