tmpg dvd author audio sync issue

[doubleJ]

Hello...
I've used tmpg dvd author for probably 10 dvd's now and every now and then there is an audio sync issue. It's not every dvd, though, and it's not the whole dvd, so I'm stumped. For instance, I just made one with 2 titles (2 dvd rips on 1 dvd with chapters for each). The first title is dead on. The second title is dead on for about 10 minutes and then get progressively worse through the next 45 minutes. Another time I noticed it was doing a tv season on dvd. It was a 2 dvd set and the first dvd was fine, but the second wasn't. In this instance, I know the source files were right. I'll have to check the source file for the previously mentioned one, tonight.
Do other people have this problem or is there a reason? I'm encoding between a celeron 1.2gh (oc'd to 1.6) and an athlon 1600 (1.4gh).
JJ

[Stryker-1]

I've no problems with DVD Author. Are you using the latest version? Is your drive(s) defragged before you start messing with the files? I make sure my partitions (set aside strictly for encoding/DVD creating) are defragged and nothing else is running in the background. I'm using WinXP (home) and have deactivated everything I can so little is running when I'm encoding, ripping, burning, etc.

[doubleJ]

I haven't defragged. I commonly multitask when I'm encoding, but dvd author uses very little cpu, so I figure it's not an issue. I've read some other reports of problems. I'm going to check further, but I downloaded dvdlab to see if that changes anything.
JJ

[doubleJ]

I checked my source files last night and it seems that the audio sync issue occurred during the avi>mpg conversion with tmpgenc and not with the mpg>dvd conversion with dvd author. That doesn't explain why the show season dvd produced sync issues as they were vcd from the start and then burned as vcd, but it explains this one. Other reports that I've seen have also mentioned them using tmpgenc. That could make more sense as enc is cpu intensive. Maybe I was multitasking when I shouldn't have been.
JJ

[echooff]

TMPGDvdAuthor accepts vcd as input but must re-encode the audio. There is a common issue of mpeg1 sync issues when converting to other formats i.e. mpeg2. Generally this problem is with tv captures. It is best IMO to check you file with a software dvd players after authoring and prior to burning. If you seperate the audio and video you can see a difference in lenght. I have seen a couple with as much as 5 seconds difference. The problem can be solved with a audio program, like cool edit and stretching the audio.

[Dimmer]

@doubleJ

When encoding and authoring, ensure that you use 48kHz sampling rate for audio, not 44.1kHz (VCD standard).

[Stryker-1]

I'm using a 3GHz P4 o/c to 3.6GHz and I still don't multitask whenever I'm doing DVD-related actions, eg ripping, encoding, etc. and I've never, every had a problem with the end result(s). I've been using DVD Author with the AC3 plugin since the day I got it. It has never sounded bad, nor been out of sync, so I always let it convert to AC3. Do you play the avi to see if everything is good? As someone else noted, it sounds like your problem is occurring in the mpg conversion. Either try another encoder or don't multitask and see what happens.

[c2p]

Well, i've been encodin with tmpgenc for 5 yrs now and i can tell ya some things to look for when u say u are having audio sync issues as i have experienced so many, i was just finally glad i found the reason for most of them, and the rest..., just dont do it, hehe.

Ok, for one, dont let tmpgenc dvd author recode audio, let a program specifically for that do that such as tmpgenc then just multiplex it back together.

When encoding, make sure resolution and fps match correctly (IE- 352x480 at 29.97 or 23.967 with 3:2 pulldown, 352x576 @25fps, 352x240 @29.97, 352x288 @25, 720x480 @29.97 or 23.967 with 3:2 pulldown, 720x576 @25fps)

VBV buffer size = to 40 for mpeg-1, 224 for mpeg-2

Do NOT change the GOP structure and use an encoding method other than CBR at the same time. This can cause audio syncage, why i dont know but it happened to me everytime, especially with KVCD templates.

Max GOPs- for ntsc-18, pal-15

Then of course, audio 48khz

Mpeg-2 = Mpeg-2 Program VBR
Mpeg-1 = Mpeg-1 System VBR (Others may use different stream but i have used this for a long time and it tends to compress a little better)

I hope this helps.

Also remember, if ur video source files are AVI, u gotta be careful because if there is a bad frame in there, it could throw off the whole video syncage.

[echooff]

Ok, for one, dont let tmpgenc dvd author recode audio, let a program specifically for that do that such as tmpgenc then just multiplex it back together.

If you are going to allow either of these programs to do the audio, use dvdauthor. Tmpgenc has a really crappy audio encoder. Should you prefer to use Tmpgenc anyway use a external encoder such as toolame. Unless you are converting from Pal<-->Ntsc you don't need to re-encode the video for standard mpeg-1, only the audio must be done.

[c2p]

well yea, thats true.

[Chaeo]

I recently used WinAvi to convert 6 programs to .vob. Each one came out fine, everything in sync. Then using TmpegDVDAuthor I added them one by
one as new tracks, sorted the chapters out etc. I found episode 2 to be out
of sync and as above, getting progessively worse. I just replaced the ep2 vob in the VIDEO_TS folder with the original WinAvi version, burned the lot and it's all in sync now. I dunno what exactly Tmpeg is doing to the files during authoring, still new at this. Since I had the set of vobs in the first place, I find it inefficient to be running it all through the Author anyway. I just needed a menu, it seems? Any ideas for that?