You might want to look at www.womble.com
The only one I tried was MPEG2VCR. But it has a more advanced version called MPEG Video Wizard
Welcome to Womble Multimedia, home of the incredible video editing software package MPEG Video Wizard DVD, MPEG Video Wizard and MPEG2VCR! Our MPEG editing software is some of the fastest available. No other software offers no-delay scrubbing - that's right, imagine sliding the timeline bar and having no lag in video, even when editing a file over a network connection! (Hardware requirements apply.) Additionally, you can edit in native MPEG format and save without re-encoding. That is an incredible time saver! Other features include:
* Frame-accurate for all editing operations for MPEG-2 Program and Transport
* MPEG-2 variable bit rate and 3:2 pull down, and MPEG-2 DVD to VCD or SVCD conversion
* Video frame rate conversion and temporal noise reduction.
* MPEG audio editor supports sample rate conversion and mixing
I find that it's most distinguishing features are the speed and saving without encoding which is an incredible time saver as he says.
Unfortunately it's not open source. At one point in time when I was trying it, sometime last year, after you have downloaded a trial and given your email, the author sent an email with a coupon code. If I remember it was something like 35% off. Not sure if he still does it.
He then had a rather active forum but there was this visitor claiming to be a customer who constantly flamed him and telling others to buy a competitive product. Personally I and others on the forum got quite upset with the flamer.
When I last visited his site I noticed that he has shut down his forum and has only an email address for support. He does reply when you email him.
I believe it's a very capable software and if you are looking for something fast, this may be it.
It's a pity about the user forum having to be shut down, but give it a try as I believe it is very capable based on what I tried.