Help. Wav is sync but compressed ac3 or mp2 are out of sync.

[Talayero]

Hi,

I have authored a dvd with a compressed dv file. The thing is that the audio is perfectly synchronized when it is in wav format. If I convert it to ac3 is out of sync.

If i convert it to mp2 then there´s is no problem at first. It is syncronized too. But when I import that mp2 to scenarist and compile, it loses the sync.

If I import the wav, scenarist says too high bitrate. So, I'm desperate. There's no solution. I only can do the authoring with Scenarist because of the menu, that is a very complicated one.

I used different programs to convert the wav to ac3 but it's always out of sync. As I said the compression to mp2 works right. I put the mp2 audio file in DVDMaestro and the resulting DVD is sync. But that same mp2 in Scenarist is out of sync.

To sum up,

1.-wav is sync but makes the bitrate too high in scenarist.
2.-ac3 is always out of sync. I used besweet, sound forge and headac3he for the compression, always with the same result.
3.-mp2 is sync, but when imported in Scenarist is out of sync.

Please, I would appreciate any help.

[guns1inger]

Is the audio out of sync by the same amount the whole way through ?

If so, it could just be a missing delay factor that needs to be added or subtracted during authoring.

[hech54]

48,000 is the key.....not 44,100.

[daphy]

48, okay - what would you sugest to make it fit?

[hech54]

Fit what?
This thread is mainly about a sync issue.

[Talayero]

Thanks for answering.

I tried to stick to 48000 KHz throug the conversion process. (wav 48000---ac3 48000) but still was out of sync.

The delay is constant: audio must start 1 second before. Right now I'm fighting with Scenarist. There you can delay the video but the audio automatically delays itself too, that's to say, in Scenarist you can't make the audio start before the video, as far as I know. Well I'm gonna try to cut out 1 sec of ac3 with HeadAC3he and see if it works.

[daphy]

@hech54

I had the same with privat video - soundtrack 44.1 KHz, after upsampling and to 48 and coverting to AC3 the sound was out of sync

[hech54]

Just for laughs....have either of you tried running your material through FixVTS?
It always solves my audio issues when doing creative ripping/editing, etc etc.

[Talayero]

I finally fixed the out of sync cutting a second out with HeadAC3he.

Tnanks for the information about FixVTS. It seems a good program. It didn't solved out my issue, but that's probably because the out of sync wasn't caused by the dvd structure, I think.