Problem with sound synch after creating DVD

olc · Post by **olc** » Tue Jun 17, 2008 8:14 pm

Dell Optiplex GX745
Windows Xp Professional service pack 2
Intel Core 2 CPU
2.13 ghx
2 gig of RAM

Video Studio 11 Plus

I have a file of just over 1 hour long of video from two different cameras. One has files saved as mpeg and the other as .mod. When i play in preview it plays and sounds Ok ( in some places video does stutter a bit!!). But when I share and create DVD disk and when the master disk is created and i play it back it goes out of synch (sound ) after about 10 minutes.

Thanks Mike

DVDDoug · Post by **DVDDoug** » Tue Jun 17, 2008 9:01 pm

Sync problems can have many different causes, and there are many different possible solutions. You can search the forums for "sync" or OOS" (OOS = Out Of Sync) to find more suggestions.

I think your .MOD files are also MPEG. I solved all of my MPEG sync problems by buying the Womble MPEG Editor. (I still use the Ulead/Corel programs for other things, including authoring/burning DVDs... just not for MPEG editing.)

When i play in preview it plays and sounds Ok ( in some places video does stutter a bit!!).

It's a good bet that one or both of your files is slightly corrupted (something's wrong with the MPEG data-structure). Frequently, a slightly-corrrupt file will play back perfectly fine, but cause trouble when you try to edit or convert it, but in your case you have a bigger clue.

Both Womble and VideoReDo have tools that can repair some MPEG corruption. The idea is to fix the file before the sync problems show-up.

Imagine that you have some bad video frames, and that these bad frames are thrown-out when the video is re-coded or re-multiplexed. If the associated audio remains intact, you now have a sync problem.... I don't know if this is exactly what's happening. It's just a hypothesis of what could be happening.

Post by **Ken Berry** » Tue Jun 17, 2008 9:26 pm

Apart from DVDDoug's helpful suggestions, you might also want to first convert your project to a DVD-compatible mpeg-2 (Share > Create Video File > DVD) instead of jumping straight into the burning module (Share > Create Disc). I realise that both your input clips are in reality mpeg-2 and both are almost undoubtedly DVD-compliant. However, rendering them -- since the .mod ones do contain different flags -- into a single mpeg-2 might remove any glitches that enter into the project during the burning process. It will also allow you to turn OFF SmartRender since that is usually the source of out of sync problems -- at least in previous versions of VS.

Though we normally counsel against re-encoding mpeg-2 video, doing it once and using high quality/high bitrate settings should not result in any loss of quality which is perceptible to the naked eye...