Weird audio sync problem!

[awhitney]

I have an mpeg2 file that was captured from the Hauppage win-tv pvr-250 and the original file is in sync, but when I want to conver the audio file to wav or ac3, the resulting dvd makes the audio out of sync!

I have used DVD-Lab and TMPGEnc dvd author and still get the same problem. I have used goldwave to match the audio to the video and remux them together and its fine, but the end result on dvd is still FRIGGIN out of sync!

Wasted 4 dvd-rs already and really would like some help.

thanks

[Barnabas]

I have the same card as you, and suspect that you are capturing from a video tape source that's not good enough, so you are dropping video frames. To find out if you did indeed drop frames, download the following file and select the "scan" feature. It will go over your file and show you how many video frames you have lost. There should not be any, or very few, but my guess is that you will see lots of dropped frames.

http://members.aon.at/cinch/pvas2030.zip

This program can fix a few of these sorts of errors, but if you ran into the typical problem of dropped video frames, you need to have a better source, use a plain video capture card that can capture to avi via VirtualDub and tell it to drop video frames when needed. Your other choice is a $300.00 TBC unit.

Your original file has padding in it that keeps the video/audio in sync, but that's lost when you cut or author to DVD.

[awhitney]

Barnabas, thanks so much for your help!

I tried out the program and scanned the video and got these errors:

LERT> video frame missing at 00:00:04.938
Syncing: Cutting audio.
ALERT> video frame missing at 00:03:58.272
Syncing: Cutting audio.
ALERT> 3 video frames missing at 00:06:58.520
Syncing: Cutting audio.
ALERT> video frame missing at 00:17:46.137
Syncing: Cutting audio.
ALERT> video frame missing at 00:20:56.462
Syncing: Cutting audio.
ALERT> 5 audio frames missing at 00:29:24.425
5 audio frame(s) missing at the end.
ALERT> Temporal structure wrong in GOP - dropping

SO thats like 6 video frames missing and 5 audio frames missing.

So, i fixed the video and will burn to dvd tomorrow.

This is about a 15 year old tape that seems to play fine. I'm using a JVC HR-s7600u vcr with a TBC and other video/audio enchancements. I guess thats not enough to fully correct a pretty old tape.

I have a great system as i have:

amd athlon xp 3000+
1GB PC3500 memory
200gb western digital hard drive
Nvidia Geforce fx 5900 ultra
Win XP Pro

thanks for the help and hope all goes well, lol!

[awhitney]

ok, WOW! I used the same program and decided to scan a mpeg2 file captured directly from my digital cable reciver and got these errors:

Syncing: Cutting video.
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:01:35.528
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:07:20.473
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:07:33.986
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:09:24.096
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:10:51.684
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:13:30.342
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:14:07.379
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:15:07.439
Syncing: Cutting audio.
ALERT> PTS less than NofP (433 ms < 467 ms) at 00:15:08.507
ALERT> Doubling of temporal offset 0
ALERT> Temporal structure wrong in GOP - dropping
ALERT> Temporal structure wrong in GOP - dropping
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:17:49.501
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:18:22.534
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
Done

This video is about 20 mins long and when I burned this to dvd, it was perfectly in sync!

This is way weird. I wish capturing was easy.

I have been capturing from my digital cable reciever and can't recall ever having audio sync problems after burning roughly 30 dvd-rs.

[Barnabas]

I rarely have any sync problems when capturing from Dishnetwork, but from tapes, that's another story. Usually, a video has to be about 30 minutes in length before the dropped frames start to show. It seems VERY odd that your digital cable is always dropping EXACTLY 14 frames at a time. NOTHING about capturing is ever easy. There are a few tapes that will have more problems capturing to the Hauppauge than to an AVI capture. Lost audio frames at the very end will not matter, as that's usually happens when you end the capture, and you cut that off anyhow.

To make the best looking captures, you should tweak your Hauppauge a bit. Hauppauge will de-interlace the video by default, but you can tweak that in your registry. The Hauppage is a little soft too, with sharpness set at 2 out of 7. You have to use graphedit to change that. There are also pre-filters you can play with too. Go to the following URL for all that info: http://www.shspvr.com

One other note, I am not sure if my JVC's TBC is bad or not, but it usually causes more sync problems than it cures! Try turning your JCV's TBC off, and use video stabilizer in place of TBC and see how that does.

We probably both need to buy a Datavideo TBC-1000 or 3000 rather than use the JVC's TBC. I would not use the TBC when you capture from cable.

[awhitney]

Well, that program worked! Worked very well and solved the sync issue on my dvd. I really appreciate the help

That graph edit is kind of confusing to use, don't quite understand how to use it from the readme file.

I was capturing those tv shows directly from the digital cable reciever and its weird to be reading these errors, but they play fantastic! Really weird!

thanks for the help and any more sure is greatly appreciated!

[Barnabas]

I discovered today, that while the TBC on the JVC makes a GREAT amount of improvement on my Hauppauge AVI capure card, it actually creates audio sync problems with my Hauppauge PVR-250 for some reason. I am adding a 2nd TBC to the picture and will let you know how that goes when I try out the stand-alone TBC.

[awhitney]

I discovered today, that while the TBC on the JVC makes a GREAT amount of improvement on my Hauppauge AVI capure card, it actually creates audio sync problems with my Hauppauge PVR-250 for some reason. I am adding a 2nd TBC to the picture and will let you know how that goes when I try out the stand-alone TBC.

heh, interesting find, thanks for the update!