simple and effective way to re-sync audio and video?

[florinandrei]

I've a DVD image that I authored a while ago, ready to be burned. The audio and video tracks are slightly out of sync. The difference is pretty small but, once you realize it's there, it's annoying.
The DVD is very simple, no menus, just one title.

What is the best way to re-sync audio and video? Is it doable without completely taking apart the DVD image?

[setarip_old]

Hi!

I believe DVD SubEdit should address your needs. As stated on the program's homepage:DVDSubEdit works with vob files or sup files (created for example by PgcDemux, or VobEdit) and does not require any demuxing/remuxing (it works directly inside the VOB files, and processing is quasi instantaneous).DVDSubEdit allows you to resynchronize your subtitles with your video, by changing the start time and the duration.You can obtain the program at:

http://www.videohelp.com/~DVDSubEdit/

[r0lZ]

DVDSubEdit cannot resync the audio, though.
To resync the audio, you have to demux, decode the audio track to shorten or lengthen it, reencode it and remux. It's not really easy.

[setarip_old]

Sorry, I must be punchy. I misread the initial post...

Based on your description of:The DVD is very simple, no menus, just one title., you should be able to use the "Audio Delay" function of DVDLab or DVDLabPro to adjust the synch...

[Guest]

best way to re-sync audio and video? Please read and follow forum rules, specifically, rule 12: do not ask what's best. Thank you.

http://forum.doom9.org/forum-rules.htm

[jeanl]

Please read and follow forum rules, specifically, rule 12: do not ask what's best. Thank you.

http://forum.doom9.org/forum-rules.htm
Take it easy neuron2! His post was clearly not in breach of rule 12! It was a genuine question about the easiest (and yes, "best") way to do something that's not easy to do... It's not like he asked whether Shrink is better than recode...
jeanl

[Guest]

Take it easy neuron2! His post was clearly not in breach of rule 12! It was a genuine question about the easiest (and yes, "best") way to do something that's not easy to do... It's not like he asked whether Shrink is better than recode...
jeanl Struck for rule 3: focus.

If you feel the need to challenge moderation decisions, do it in PM.

[florinandrei]

Please read and follow forum rules, specifically, rule 12: do not ask what's best. Thank you.
Can you recommend me something that, in your opinion, is a simple and effective way to resync the audio and video tracks of an already-authored DVD image?
If there is no "simple and effective" way, is there still a method that you could recommend?

P.S.: I changed the thread title.

[florinandrei]

Based on your description of:, you should be able to use the "Audio Delay" function of DVDLab or DVDLabPro to adjust the synch...
I must be dense - DVDLabPro seems totally oriented towards its own work flow, it seems to insist to create a project from scratch, etc.
Is there a way to tweak just a VOB with DVDLab?

[r0lZ]

I don't want to polemicize, but jeanl is obviously right. The goal of this forum is to provide information on the "best way" to do things, no?

[jeanl]

Struck for rule 3: focus.
If you feel the need to challenge moderation decisions, do it in PM.

neuron2

Striking me for "rule 3" because I disagree with you in public quite simply amounts to censorship. If I disagree with you and want to make a public statement about it, how am I supposed to do that? Create a new thread?

As a moderator, you're supposed to facilitate the discussion. The kind of facilitating you're doing in this thread is like using a sledgehammer to fix a watch.

Alienating users, both newbies and old-timers, isn't goint to make this forum any better.

Jeanl

[florinandrei]

OK, I reformulated the question according to forum rules, that's fine with me.

Now back to the original topic:
Tweaking the A/V sync seems to me like a pretty important and basic operation. I am surprised that there aren't more applications that can do it, although many seem quite able to host such a facility based on their other features.

Anyone else thinks this is a paradox?

P.S.: I still can't figure out how to tweak the A/V sync of an already-made DVD image. :mad:

[Surf]

Quote:
"Tweaking the A/V sync seems to me like a pretty important and basic operation."

DVD is made up of VOB files which is in mpeg2 format containing video, audio, subtitle(s) and directional instructions.

You need to de-mux the files into a video file and an audio file and then re-mux the two together with INSTRUCTION to the mux program that the audio is delayed or advanced(outa sync).

There you go, have fun finding for yourself how to do so.

[Matthew]

@jeanl, you are on a hiding to nothing ;)

Anyway, unfortunately you have to reauthor, as state above (e.g. by Surf). There ain't no way around it. You are lucky the dvd is one title, no menu.

IMO a good way to do this is to use DVDMaestro+preview (Cinemaster installed), which permits realtime testing of positive audio delays. Because only positive audio delays are possible, cutting a few frames off the audio track(s) to begin with may be a good idea.

A free alternative is to use MuxMan. Replicate the audio (say) AC3 a number of times and mux a dvd with differing audio delays (e.g. -128,-96,-64,+64,+96,+128). Test each track and pick the one that seems closest. Then recreate the dvd with this track's delay. I've done this myself and it's a relatively easy approach.

[setarip_old]

@florinandrei

As I said before, based on your description of:
,The DVD is very simple, no menus, just one title, you should be able to use the "Audio Delay" function of DVDLab or DVDLabPro to adjust the synch.

All you have to do is:

1) Load your "assets" (The .VOBs) into DVDLab
2) Choose TO join the .VOBs into one .VOB
3) Choose to demultiplex
4) Drag & Drop the new joined .VOB's .M2V and .AC3 streams onto the "Movie" window
5) From the "Tools dropdown menu, select "Audio Delay" - and adjust as necessary
6) Save your new DVD "package"

See the following link:

http://www.mediachance.com/dvdlab/Help/tools.htm