Quantcast BbMPEG: Audio Sync Problems - digitalFAQ.com Forums [Archives]
  #1  
07-19-2003, 10:32 PM
DKruskie DKruskie is offline
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I have tried like 6 times to get the audio insync with video, but cant seem to get it. I have tried audio delay, video delay. I used headac3he to do the audio. Is there aything else I can do..the audio is like -43ms. I have never encountered this kinda problem before.


David
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  #2  
07-19-2003, 10:36 PM
vhelp vhelp is offline
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hi DKruskie,

If anything, make sure that the "frame rate" has not ben changed ie,
* you converted 29.970 to 23.976 or 25 fps.

Otherwise, you have to stream it w/ soft "somthing" to stretch the audio.
Sorry, then app name escapes me.

-vhelp
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  #3  
07-19-2003, 10:46 PM
DKruskie DKruskie is offline
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Yes I used force film on it since it was film 99%



David
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07-19-2003, 10:58 PM
vhelp vhelp is offline
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@ DKruskie,

hmm.. So, lets see.. you:
* dvd ripped it
* used forced film (ie, 23.976)
* encoded it to an .m1v (or, .m2v for MPEG-2)
* converted your AC3 (aka wav) to an .MP2 w/ HeadAC3
* MUXed ?? your aud/video to an final .mpg file ??

Audio...
What I do is, (for MPEG-2) I:
* TMPG: encode to .m2v -- (video only, no audio)
* TMPG: then, make an .MP2 -- (audio only) (very quick)
* Either/OR, I convert my AC3 (aka wav) to .MP2 w/ HeadAC3
* MUX w/ bbMPEG w/ (o) DVD specs.

I think that's about it so far.
-vhelp
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  #5  
07-19-2003, 11:08 PM
DKruskie DKruskie is offline
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Encoded it to .m1v..
It came from a double sided dvd..so I decided to make it a 2 cd's.. ripped the first side and it came out perfect..just the second half of the movie is out of sync.


David
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  #6  
07-19-2003, 11:21 PM
dazedconfused dazedconfused is offline
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Hey DKruskie,

When you created your .d2v project file in dvd2avi, did you just combine both sides of your dvd into 1 project file, or did you use 2 separate project files? Because I've noticed that adding more than 1 vob to the same project file often leads to audio sync issues after the first vob. If you can find the exact spot where vob #1 ends and #2 starts, then you could split the file and use video/audio startup delays in bbmpeg to try and correct the audio on the second half (keep in mind that milliseconds are very tiny, so the delays you set will need to be quite large to make a noticeable difference).

But if this isn't what you did, and doesn't apply to your situation then Sorry, don't know what to tell ya...other than good luck!

-d&c
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  #7  
07-19-2003, 11:45 PM
DKruskie DKruskie is offline
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Nope I didnt combine them..tried that before and was completely horrible, havent tried it again either. I guess maybe I didnt make a large enough delay for audio, gonna try again with a larger amount to see if it works.

David
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  #8  
07-20-2003, 12:03 AM
vhelp vhelp is offline
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dude, DKruskie.. NTSC land..

Are you cutting pieces out before encoding ??

LEAVE them in their.
* Just use TMPG to cut in source, in Source Range.
* then, encode only video (ie, .m1v) and,
* then, encode only audio (ie, .mp2) (all under TMPG)
* THEN, MUX your au/vid together w/ bbMPEG.

Don't use bbMPEG to splice or anything. Do it all under TMPG's Source Range !!

Forget HeadAC3 and BeSweet and anything else.

What it sounds like, is, you are cutting pieces out, and THEN encoding. It
doesn't seem to be working for you this time.

I've even encoded audio w/ 112k, and to me, it sound good. Not like the
original AC3, but good, none the less.

Try the above (when you have time)
-vhelp
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  #9  
07-20-2003, 12:25 AM
DKruskie DKruskie is offline
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Nope I actually dont cut out anything, not even the ending credits. I finally got it insync with using a large amount of 1376ms. I still cant figure out why it was out of sync since I had to rip each side of the dvd, and encoding them separately. I always make the audio at 112, it sounds great to me.


David
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  #10  
07-20-2003, 01:29 AM
dazedconfused dazedconfused is offline
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@Dkruskie,

Glad you solved your sync problem.

Next time you get a strange audio sync problem for no apparent reason, you might want to try using MPEG Mediator to demux the audio from your vob file first, and then try converting that wav file to mp2 with HeadAC3he. I think I remember Kwag saying that this process worked on a few movies in the past where dvd2avi didn't seem to demux the audio properly from them for some strange reason. That way, you'd still be using HeadAC3he for your audio, rather than settling for TMPG.

@all,

I trim off unnecessary start/end credits in dvd2avi 1.76 before encoding all the time and don't think I've ever had any audio sync issues result from doing so (though I'm certainly not saying this couldn't happen)...so I'd have to say it's pretty safe to trim in dvd2avi. It's only when you try adding multiple vobs within the same project file that sync problems seem to occur (in my experiences at least). The only time I ever add multiple vobs to a .d2v project file is purely for prediction purposes only (like when putting multiple tv episodes onto 1 disc and I need to find which CQ level to use). But afterwards I create seperate .d2v's for each episode and encode individually at that given CQ level. Just my $0.02 on dvd2avi trimming.

-d&c
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