I have a gig in MPEG1 format and I'd like to split it to many separate parts, losslessly of course. I'd prefer the visual way - there should be a seek-bar with real-time preview of video (and audio too) and a button to put "split-marks" here and there, then it should split the file between "split-marks" and save the splitted parts as several streams (stream1 stream2 ... etc). VirtualDub wants to convert to AVI, TMPGEnc lets me do A-B selections only, is there a free tool doing what I want?

such a thing would be really nice indeed.
but AFAIK you are bound to split by frame or size... or do you know a shareware tool that does as you described (as you explicitly mentioned freeware)?

Nope, I'm not aware of such a tool even being commercial, though I'd guess that something like that must exist.
Anyway, I did what I wanted in the DVD authoring stage - I've split the gig into chapters with Power Producer 2 Gold. The problem was that audio got out of sync with time after burning (originally it plays OK) so I thought that splitting the original file would fix the problem. Splitting into chapters worked too though.

TMPGEnc should be able to do what you want.

Edit: Look in the "mpeg tools" menu entry.

As I wrote in the 1st post, TMPGEnc allows A-B selections only (one at a time) and its navigation isn't very precise.

Ah damn, sorry.

OK, then try Womble MPEG Video Wizard. It's not free, but it should work 30 days in trial mode.

Thanks I'll take a look at it.