Replacing glitched audio in DVD transfers from VHS tapes.

[ramrod1234]

Hey guys.
So basically im transferring old VHS tapes of music concerts and music videos onto DVD. These tapes do sometimes have glitches in the audio.
Its usually either quick dropout of the audio into blank sound, or a deeper, muffled audio dropping in and out, or click noises. Its not frequently, but it is obvious in a couple of the vhs tapes.

What im doing is transferring these VHS tapes from vhs player into my dvd recorder, then im wanting to REPLACE the audio of some of the songs on the dvd with the actual mp3 equivalent. (i read you cant use MP3, but what about wav?)

So how would i do this? I have access to any tools or programs available (free or payed).

From reading a bit, i was thinking of doing it like this.

Burn the 40min video from dvd recorder > DVD. (its all authored etc, menu's and chapters etc).
Would i use DVD decrypter to rip the entire dvd onto pc? if so, should i make it one HUGE vob file (3gb +) and edit that entirely. Demux it, open up the entire dvd audio in soundforge or something, cut out and replace the glitched songs with the wav equivalent of that song and resave the entire audio, then remux and reburn?
Im wanting to do this without a loss of quality, so i dont want to re-encode if possible. jsut replace the audio.
Is that the right path?
any help would be awesome!
thanks guys !

[Vidd]

You don't need a decrypter program since you made the DVD yourself and it is not protected. You could just use windows explorer to copy it to your hard drive.

1 - Use PgcDemux to demux the vobs into a video stream and audio stream.
2 - Edit the audio, save it as PCM WAV, AC3, or MPA. Make it 48kHz.
3 - Author the video and and new audio stream with MuxMan. Import the the chapter list that PgcDemux created.
4 - Use PgcEdit to replace the old titleset with the new titleset you created with MuxMan. This will retain the old menus and navigation.


WAV is a lot larger than ac3 and mpa. You may need to compress it with Aften or tooLame to make it fit on a disc.

[ramrod1234]

i have soundforge pro, is that a good program to edit the audio?
the default audio is Dolby digital 2ch, so im not sure the format that is.

thanks for the info though, ill definitely try it!

[takearushfan]

Vidd, I have a question. I'm by no means an expert (to say the least), but he said he'd prefer not to lose audio quality. Though it's been my understanding that AC3s are lossy. So wouldn't he prefer WAV, despite how large the file size would be? Or are you saying that "Aften" and "tooLame" will compress the audio in a non-lossy manner, ie. the way SHN or FLAC compress without losing quality? I'm completely unfamiliar with those two apps.
(yeah, I'm pretty much as lost as the OP)

[redwudz]

Since he's sort of 'stuck' using the DVD recorder, the audio format it uses is what he needs to work with. But generally VHS audio isn't that great anyway, so quality loss is not a big issue. If you started with a CD quality audio source, then you would want to be more careful with changing audio formats to reduce quality loss.

I would suspect most times you would need to filter the VHS audio to clean it up a bit and maybe do some editing. Converting to a format like PCM or WAV before processing may reduce losses a bit. But you may end up with a huge edited file. Then you would probably convert it back to something like AC3 2 channel Dolby for inclusion on a DVD. I use the freeware audio editor Audacity for filtering and editing most times, then I usually convert back to AC3 with Aften or ffmpeggui. Lots of other ways to do all this.