Redubbing videos

[hitbit]

I think that is a pretty basic question, but I'm completely new to all this NLE stuff...
I've some old music videos, mainly in mpg format, and the audio is usually poor. I want to replace the audio track with a better one, ripped by CD. Obviously the main goal is keep everything in sync, so I'll need a tool that can visualize the waveforms and allows resample/timestretching. Also, the worst thing is that some videos suffers of occasional change of speed (maybe they're taken from old VHS) so I could need to insert/delete single frames to stay in sync.
There are some tools, commercial or not, that allows all these things?

[theReal]

Premiere and Premiere Pro can definitely do it, also Final Cut Pro (for Mac only). I think you could also do it with Avid or any other good NLE program.

[miztadux]

i did the exact same thing with a bunch of vcd music videos and some movies.

as i like doing stuff manually i only used cool edit pro (now adobe audition): in multi-track view you see each track's wave peaks aligned in the same window.
the drawback (i said "manually") is that there's no special function that i know of to help sync'ing tracks...
so i used to align the tracks (by zooming near to sample scale on easily identified peaks), figure out the delay between them, and resample the "new" track to match the original.
of course the multi track view only helps to sync tracks, you won't actually "mixdown" the tracks, but just use the view to estimate the differences between them and get accurate value for the resample you'll have to do.
it also helps to preview the result:
you can play the multi-track to estimate the sync, there will be some echo like effect if they're not synced.
you can even invert one of the tracks, so the result of the addition should be only the differences (the noise in the orignal track) if they're perfectly synced.

the tough part is to insert or delete some samples, i have no idea how to do that automatically.
with music vids i only encountered remastered versions of the cd track where some parts were removed, i found thoses missing parts by playing the two tracks (already synced) at the same time to notice where things went wrong.

ok it's a basic method that requires a lot of time and trial-and-error, but i've managed to sync a lot of vids this way and even some hdtv caps with dvd 5.1 tracks...perhaps this can help...

a side note:
the idea here is not to do post-syncro between the video and a given audio track, but to assume the original audio is already synced to the video so that all you need to do is sync the new audio with the original...to do so you don't need any video editing software, just a good audio soft

[hitbit]

thanx miztadux, it's exactly the method I intended to follow. Some times ago I've tried to sync tracks in Cubase SX, and it worked. Being lazy, I wanted to use a video editor to do the sync and mux directly the resulting audio track in the movie with the same program, but I've found that working with premiere is a nightmare, regarding importing and exporting files. Oh well, back to the old drawing board.

[hendrix]

you can also do it easily with Vegas - what you can do is hold the Ctrl key and drag the audio clip it'll time compress without changing the pitch. to fine tune what you can do is at the points where the audio starts to drift make a splice and time compress...it may take some time but it very easy.