Audio not matching with video

[jh1017]

hi.
I've been trying to convert an avi video file to an mp4 video file. Some of the avi's I've converted are fine, but when I convert some other avi's to mp4 the audio is not matched correctly with the video. I've used xilisoft video converter as well as super video converter. neither work on these particular files.

How do I go about fixing this?

thanks

[Marvingj]

use Besweet it can correct it....audio sync problem. There are alot of Guides on the right that correct audio sync problems to your right by many comrades..

[Jo The Veteran]

When avis desynchronize sometimes it's because of their vbr format.
Try to re-compress those avis sound into standard cbr mp3 and mix those mp3s with the avis. Are the newly created avis synchronized then? If yes then i think converting to mp4 will work.
If not then save their sound streams as uncompressed wav, mux those streams with the avis and try again to convert to mp4.
I don't think there's gonna be trouble anywhere.
Use vdubmod for the whole thing.

[agent222]

I have an mpeg file converted from VOB. The video seems to be approximately 34 secs ahead of the audio. Is there z simple tool/method to fix this problem? I've seen BeSweer recommended, but nothing that would tell me on how to use this to fix my problem.

[45tripp]

demux

delaycut

remux

[agent222]

demux

delaycut

remux

Tripp;
from the three phrases in your response, I take it that they are the steps in BeSweet to be used in fixing audio sync problems.
I may try the BeSweet solution, however in between my posting the question, and, your response I "Googled" the question and found a guide that showed a method using TMPEGEncoder, and, GoldWave. I hope I followed the steps showed in the guide correctly, but the version of GoldWave showed in the guide was apparently older than the version I have, because the "windows" in the guide didn't quite match up with what I seen when I went to GoldWave . So We'll have to see what the result is after the two files are recombined.

[45tripp]

No, it's a separate app.
if you'd clicked on the link you'd have seen that.

http://jsoto.posunplugged.com/audiotools.htm

goldwave is fine for audio processing, but you asked for simple.
and it is simple, why comlpicate.
you'll also have to then encode to ac3 after goldwave (assuming ac3)

gl

[agent222]

Tripp;

I didn't recognize that Delay was a link. But with that being a link, I do presume that the others would be commands for that app, correct?

[45tripp]

No,

I assumed you'd be familiar with the basic video processing terms.

1.demux=demultiplex
separate the stream into it's elementary video and audio streams.

2.process audio with delaycut app.

3.remux
combine video with newly prossesed audio, creating a new synced program stream.


TMPGenc
has "mpeg tools"
useful for mpeg muxing/de-muxing

https://www.videohelp.com/tools/sections/video-de-multiplexers

gl

[agent222]

Trip;

I AM familiar with with most "Video processing" terms, and, the more I do with converting various compression formats to DVD the more I learn. The problem here is that "remux" and "demux" are terms that I wasn't readily familiar with, since I very seldom encounter sync problem, and, I was looking at the context of your original message.

Now, with your kind indulgence, I see that they are not commands, but processes, or, steps to be taken, in order to solve my sync problem.

(BTW, with trying the TMPG/GoldWave method, I am now a little familiar with using MPEG tools there to separate, then recombine the streams. And, it's looks like I will become more familiar
doing that, as the method I describe above didn't work, more than very likely from something I did incorrectly.)

[agent222]

Delaycut measures in msecs, I which I presume is an abbreviation for milliseconds-thousands of a second. Since my audio seems delayed by approximately 34 seconds in the original file, I need to cut 34000 msecs, right? And, from which, the start, or the finish?

I have demuxed-separated the audio, and, video streams, using mpeg tools in TMPGencoder, but if I try to remux,recombine the streams, using the muliplexer it just sits there, and, does nothing.So I've used the project wizard to recombine the streams. Is that the right step? If not, why does the multiplexer just sit there? (presuming that then is the correct final step before conversion to DVD.)

Thanks

[45tripp]

Since my audio seems delayed by approximately 34 seconds in the original file, I need to cut 34000 msecs, right? And, from which, the start, or the finish?

34000 yes.
cut no.
if audio is delayed, running behind video, you need it to delay, insert silence, +34000 at the start (yes).
I don't know what you are working with but in the delaycut window there's a target file info section, where you can see what you are doing.

So I've used the project wizard to recombine the streams. Is that the right step?
(presuming that then is the correct final step before conversion to DVD.)

no. project wizard leads to encoding.
you can try imagompeg-muxer for muxing then.

it's not actually the last step to authoring.
authoring apps i use take elementary streams,
so you don't mux, you go straight to authoring.
you could mux to test syncing went well, but it's not necessary

I'd use vdubmod, with ac3acm installed to check syncing.
load m2v and add fixed ac3 stream, playback to check syncing

gl

[agent222]

Trip;

The program you recommended,imagompeg-muxer, seems straight forward enough, as was delaycut-my confusion there was from dealing in milliseconds mainly. But imagompeg-muxer doesn't want to recognize the mpeg video file created when I demuxed, nor, any, mpeg files in the folder where video I'm trying to work with is located. Do I have to rename the file type to get the program to recognize the file, or, what?

[45tripp]

what do you mean recognize?

it has to be an elementary mpeg2 stream with one of the following extensions: m2v, mv2, mpv
is it mpeg2? from the little you say, i'd think not.
or you've gone very wrong along the way. can't tell.
In which case a lot changes.
tmpg would demux an mpeg2 mpg program stream to elementary audio and elementary mpeg2 with an m2v extension.

if it's just a imago problem
like i said,
i wouldn't bother with muxing,
i'd use vdubmod to check syncing,
and go straight to authoring.

if you can import into your authoring app, it's fine.

if you run into more problems you'll have to be more descriptive and provide more precise information.
like providing mediainfo/gspot info on your files.

gl

[agent222]

I haven't used it in a long while, but I do have TMPGAuthor, which I believe allows you to import separate video/audio streams for authoring. But in case I'm wrong, I happen to have VDubMod,
how would I use that app to check sync?

[45tripp]

I'd use vdubmod, with ac3acm installed to check syncing.
load m2v and add fixed ac3 stream, playback to check syncing

drag video into vdubmod
under 'streams' -> 'stream list' -> click 'Add'
and add your audio file.
drag the slider around in your video and play sections of it to see if audio is synced.

[agent222]

Trip,I am about throw this video file into the trash over my frustration.
I opened in VDubMod, on separate tries, the separated video, and, an recreated original mpeg-1 file. I then went to Streams>Streams List>add, opened the supposedly "fixed" mpa audio file. Hit OK. Then tried to preview the files. No Sound! Now obviously either I did something wrong in using Delaycut, or, I'm doing something wrong in trying to use VDubMod to preview the results.

If it will help any, I'll review here the step I took to create the original mpeg-1 file.
The video file I "acquired" originally came as as the individual parts of a DVD file, in other words VOB, and, VTS. I then used VOB2MPG to "create" an mpeg file. When I previewed this file before I was going to burn it to DVD, I noted that the first sound-the trade marked "roar" of a symbol wasn't heard until about 34 whole seconds after the first image.

If there is anymore information I can give you that might help, let me know.

[45tripp]

you're not doing anything wrong.

i'd assumed mpeg2 ac3.
by the end i'd suspected mpeg1 and mpa
but you didn't confirm.
it's always good to post info on your files with the aid of gspot or mediainfo.

you need acm mp2
http://www.geocities.com/wilbertdijkhof/qmpeg_mp2.zip

extract.
right click the .inf and click install.
close and re-open vdubmod,
re-try

gl

[agent222]

I AM GIVING UP! THE FREAKING CODEC WON"T INSTALL WITHOUT THE ACM FILE; THE ACM FILE IN THE WINZIP WON"T ASSOCIATE WITH THE INF. IT ISN"T WORTH THE HASSLE!

[45tripp]

works for me.

just author...

check audio video sync by opening each file separately and noting times...

[KneeRow]

Couldn't he have used Goldwave to extract the audio and then normal VirtualDub to merge (remux)?

With Goldwave he could have inserted silence where ever he wanted it.

Seems simpler to me to use just 2 programs than 4.

[45tripp]

Seems simpler to me to use just 2 programs than 4.

You're counting wrong,
amongst other things.

[agent222]

Yes the problem was the audio coming in after the video (34 sec -approx) so I didn't need silence, I needed to remove slience.
Tripp recommended VDubMod to check and see if I had been able to remove enough silence from the beginning to get the two tracks to sync.

[KneeRow]

Okay, from the top:

Step 1: You can cut the sound out with Goldwave, save as WAV
Step 2: Merge the WAV-sound with avi in Vdub, or VdubMod.

Why can't you do this? What am I missing? The acm-thing? I don't wanna sound odd, but did you unzip it first, whatever it was that you were trying to use to install ACM?
You must UNzip it first, get it OUT of the compressed map, WinXP sucks like that, you think it's unzipped and it's not.

Step 1 Extended explanation
1a. You load the avi in Goldwave. This will show you a visual representation of the sound of the AVI
1b. you can mark the beginning of the non-silence bit, like 34 secs in, right? the end is just the end, set that under Edit|Marker| Set
1c.. Now save it as a wav-file, this should be the length of the avi-file MINUS 34 secs.

Please say exactly where your problem lies.

Personally I think TMPGenc is overrated, it's kinda slow and it has all these unexpected protectinon shitstuff going on, so ...

[agent222]

Knee;

I tried GoldWave; I tried the program Tripp recomended, then trying to check the results in VDubMod. I got the ACM filter. Then tried to view the results in VDubMod, which I couldn't. I gave up, it just wasn't worth the hassle.