Audio Sync Problems... I'm lost!!!!

[eminence]

Hello all...

I usually don't post much, as most of my problems I have been able to find the solution by searching through the forums and reading all of your great posts...

But now, I am lost... I am not even sure if this is the right section... But please help!

Ok, I am taking misc. music videos, and complying them onto one disc (sort of a best of dvd). I have done 3, 2 work fine, 1 is driving me crazy.

Here is what I did...

1) Ripped video with DVDShrink (the sections I want).
2) Using Nerevision Express 2 (cause 3 kept freezing), I complied the order, added effects and transitions, and exported the file to MPeg 2. All works great so far.
3) Import the Mpeg file to Tmpgenc DVD Author, create chapters, menu, and then export to DVD (ready to burn to disc).

Now here is the problem. When I am done with TMPGenc, the vob files are out of sync... Starts fine, but about half way through the video, audio is out of sync, and gets worse...

I have tried demuxing and remuxing the mpeg, then bring it into TMPGenc. I have demuxed, then seperatly imported the M2V and PCM to Tmpgenc. I have tried converting the wav to AC3, and doing the same... But no matter what, I lose audio syne half way through the video...

Question is, why, and I can I fix this? How can I take the Mpeg (created with Nero Vision) chapter and author it to put on disc?

Any ideas are welcome, thanx in advance,

Eminence

[rkr1958]

In TMPGEnc DVDAuthor record the length of the m2v (video) file. (e.g., 10:01;24, assuming 30fps would equal 10-minutes, 1.8-seconds). Load the PCM audio in Goldwave (free 30-day trial) and check the length (e.g., 10-minutes 0.75-seconds). Use the resample function to make sure the audio is 48-KHz. Next, use the timewarp function to make the audio the same length as the video (e.g., 10-minutes, 1.8-seconds). Load the edited in audio with the m2v video in TMPGEnc DVDAuthor. The resulting authored video and audio should now be in sync. Good Luck.

[proxyx99]

I don't use TMPG DVD Author but there's been some posts about sync issue with DVD's made with this tool. Above is the method to fix it but isn't DVD Author reencoding audio? So what's causing it?

[rkr1958]

I believe it's has to do with a slight bit error rate in the audio during capture (e.g., you're player thinks the audio is 32-kHz but it's acutally 31990 Hz). I don't believe TMPGEnc DVDAuthor is the problem. Like I said in my first post I use TMPGEnc DVDAuthor in my VHS to DVD conversion where I do have to use the above method to ensure audio / video sync. The original source is AVI and must by encoded before authoring. However, when using DVDAuthor to cut out commerials from TIVO TV-captures, which I write to a DVD-RW and rip to my pc, I have no audio / sync problems even for shows running more the 2-hours.

[spiderman2k1]

The problem might bein the capture. Adn there are some trick to fix the problem if its from the VHS tape. The best thing is a "TIME BASE CONVERTER" also called TBC but these cost alot but do work the best. I have one in my Panasonc E80 and can capture any VHS tape with no soound problems now.

Other fix would just be to capture the video. Then use TMPG to encode the sound and video at the same time making a new file. Use MPEG2VCR first to see if there is any sound problem. Some times you get sound problems when you auther the DVD. So encode and make a new file.

Check out this site http://www.dazzlegeek.com/ evenif you do not have this card you can still get some tips. Capture at 720*480 at a high bitrate works for some people.

Another trick if you have a world wide VCR is to out put in a different format. I live in the USA im NTSC. I would capture in PAL-N then encodein TMPG if I want a NTSC code.

But the best thing is a TBC to capture VHS to DVD

[eminence]

Ok all, thanx for the input... Here is the scenario..

M2V file = MPeg-2, 720X480 29.97 fps (4:3) NTSC, 4800 kbps in TMPGEnc DVD Author with a time of 1:18:36:01.

PCM Wave = Wave PCM signed 16bit, 48000 Hz, 1536 kbps, stereo in goldwave with a time of 1:18:36.049.

Is the sample rate Ok? I will now try time warp to make them equal, but the time is off by .048... Could that be it? Or is something else wrong... I have never had this problem before, usually just demux, and remux and all cleared up... This time headaches...

Thanx again,

Eminence

[eminence]

In this case I am not capturing the original video... I am ripoping from source DVD.s... To Vob, then importing the vob to Nero Vision 2, adding transitions (in the order I want), exporting to MPeg 2, then I bring it into TMPGEnc DVD Author, add chapters and a menu, and author, ready to burn to disc.... Usuall y works, but this one disc is killing me...

To capture (or record from TV), I use my Panisonic DVD Recorder, writre to Ram disc, import to PC using DVD Author, cut out unwanted parts, add chapters, add menu, and export... Burn with Copy2DVD/Nero.. And no problems.... Never had a sync issue that way...

Maybe the problem I am having is that I am using video clips from different DVD's, so different info being put together... But as I said, I am complying 3 discs, 2 worked fine, one audio sync problems... I have tried converting all the original vob's to the same settings, then use nero to comply, and the same problem... What gives, only after TMPGenc... How else can I chapter, add menu, and author so that I can burn to disc?

Thanx again..

Eminence

[rkr1958]

Ok all, thanx for the input... Here is the scenario..

M2V file = MPeg-2, 720X480 29.97 fps (4:3) NTSC, 4800 kbps in TMPGEnc DVD Author with a time of 1:18:36:01.

PCM Wave = Wave PCM signed 16bit, 48000 Hz, 1536 kbps, stereo in goldwave with a time of 1:18:36.049.

Is the sample rate Ok? I will now try time warp to make them equal, but the time is off by .048... Could that be it? Or is something else wrong... I have never had this problem before, usually just demux, and remux and all cleared up... This time headaches...

Thanx again,

Eminence

Audio sample rate 48-KHz is good. That's the only PCM sample rate that TMPGEnc DVDAuthor will accept. M2V file length "1:18:36:01", is that 1:18:36.01 or 1:18:36;1? (note that the later is equivalent to 1:18:36.0333 at 30 fps).

The time difference between your audio and M2V implies that your audio is getting behind your video when losing sync by almost .05-seconds. Is that what's happening?

Give it time. Use timewrap to set the audio length to 1:18:36.01 (or 1:18:36.0333, whichever is the correct length). Select that new audio stream in TMPGEnc DVDAuthor. Next, which still in the edit mode, go to a point near the end of the video where you can directly see someone talking or singing. If the audio and video are in sync there then when you author they will remain in sync.

Note, the method I described fixes audio / video sync problems caused by a sync drift and not a sudden jump.

Something I should have asked up front. What type of sync problem do you have? If it's the later then we need to use another method to fix it. Let me know if that's the case, I've got a method I've used for a sudden sync issue.

[kly577]

How do you convert the time? I have the same problem with a football game that was taken from VHS. There is a gradual sync issue. The audio starts off with the video and then gradually gets behind the video when it is played. This happened when the video was encoded to a resolution of 720x480 (it was captured at 480x480). I ran it through virtualdub to apply some filters since the tape was from 1996 and recorded in SLP mode. I then used the framserver to get the audio and video to tmpegenc. I have the files seperated at this point and the following are my details. I am just not sure how to convert the time I see in Tmpg DVD author into the format that I see in Goldwave

Video legnth as reported by tmpg dvd author = 03:05:10;03

Audio legnth as reported by goldwave = 03:05:10.167

Any assistance would be greatly appreciated.

Everyone enjoy their weekend!

[rkr1958]

How do you convert the time? ...
Video legnth as reported by tmpg dvd author = 03:05:10;03

Audio legnth as reported by goldwave = 03:05:10.167

Any assistance would be greatly appreciated.

Everyone enjoy their weekend!

Assuming 30fps (frames-per-second), then your video is 03:05:10.1 seconds long. Thus, by the end of the movie your audio is .067-seconds ahead of the video. Make sure, in Goldwave that your audio is 48-KHz (if not, convert it). Then use the timewarp function to make the audio length equal to the video length of 03:05:10.1. Load the audio along with the video into TMPGEnc DVDAuthor and check near the end of the movie for how well it syncs.

Good luck.

[spectroelectro]

Your problem is that you messed with the MPEG-2 file.

"[I] added effects and transitions, and exported the file to MPeg 2. All works great so far."

That's the source of your problem. When you rip a DVD, don't mess with the MPEG-2 file other than to run something like ReJig or DVDShrink on it. No edits, no effects, no transitions, nothing. Any time you edit a large MPEG-2 file from a ripped DVD you're begging for problems.

Audio sync issues are the single most common type of post on www.videohelp.com. The typical causes for audio sync problems are:

[1] Editing or re-encoding two different types of MPEG-2 file together; viz., 2 different sample rates, or 2 different frame sizes like D1 and 704 x 480.

[2] demuxing elementary video from audio and remuxing with elementary audio with a different sample rate

[3] capturing the video with a PCI video capture card with a drifting clock (i.e., no hard sync with the auido stream).

[4] incorrect sample rate conversion of the audio stream.

Your problem fits into category 1. If you rip the VOBs and don't do anything to the m2v other than reducing it in size with ReJig, you shouldn't have any audio sync problems.

[Matt D]

Hey, are you adding all these different bits and pieces to the same track inside Author? Doing that has many times caused sync problems for me.

[kly577]

It would be nice if there were an easy way to remux the audio and video to test the file. When I try to use the mpeg tools to remux them it give me an error (something about linear PCM). I don't use tmpg DVD author, I usually use either sonic or Ulead.

[kly577]

Still having headaches, this video has a run time of 03:05:09 and tmpegenc dvd author says it is too large for a DL dvd at 9231MB. I am guessing this has to be re-encoded again after using timewarp since I had to save it to wav format instead of mp2. Anyone know of an easier way to remux the audio and video files?

[Baldrick]

You can test with Media Player Classic. Just name the files like
video.m2v
video.wav
and play the m2v and the audio will be played automatically.

[kly577]

FIXED....very weird, but it was exactly one second off. Not sure how it happened, but the video was being reported to only be 03:07:07;04 and the audio was being reported as 03:07:18.480. Since it was a football game, I looked at the clock because they said "there's the final gun" and it was exactly one second. So I timewarped the audio to be 03:07:19.480 and everything is in sync perfectly. Thanks for all the helps.

Ken