vegas 5 render audio out of sync

[glamdrac]

I am using vegas 5 to edit in titles, effects, transitions. etc. into a home movie that i took. The video is a half hour long and is mpeg2, 740x480. the sound is stereo 224kbps. When playing the final video, the audio is fine in the beginning, but is about 1.5 seconds off toward the end. Does anybody have a solution to this? I was thinking about chopping it into 3 sections and rendering them individually, then joining them after.

[erratic]

If the audio is already out of sync on the timeline you can try to sync it like this:

Right click on the audio track and select Group -> Remove From. Now hold down the Control key while grabbing the end of the audio track with the mouse and stretching/shrinking it until it matches the video. You can verify the result immediately on the timeline and make small corrections if necessary.

If your sync problem only occurs after rendering then you have a different problem.

[glamdrac]

when i open the project in vegas and render a loop region of an area that i know is out of sync in the final video, it plays perfectly. So whatever the problem is, its happening during the render process. My pc is 2 ghz with a half gig of ram. So that shouldn't be the problem.

[erratic]

Strange. That has never happened to me. Does it happen with all your projects or just with this particular one?

Anyway, I don't know why you're losing sync, but if you can render individual loop regions without sync problems then try your own suggestion: render three parts of the project separately and join them with TMPGEnc's MPEG Tools or Womble MPEG Video Wizard.

[glamdrac]

hmmm. what format do you usually render to? I'm rendering to the mpeg2 dvd ntsc format. Something that may be important to know is that I tried to create this exact same project in Ulead MediaStudio Pro and the same thing happened.

[erratic]

I'm in PAL land so I usually render to PAL MPEG-2, but I always render audio and video separately and (if necessary) mux afterwards. Not just separate files, but separate renders for video (MPEG-2) and audio (AC3).

But I don't think that would help in your case, as the sync problem also occurs with Mediastudio.

What you could try is render the audio as an uncompressed wav file, import that wav file in your project and verify if the wav file is now out of sync with the video also. That wouldn't take long.

[glamdrac]

what program do you use to mux the files together? It would at least be woth a shot to try.

[erratic]

TMPGEnc (MPEG Tools).

[hexxisoft]

sounds like you're rendering from something with dropped frames maybe?

[glamdrac]

I think I figured out the problem. I used a video capture device to copy the movie to my hard drive. Whenever I use it, and cut the movie (with any program I try), the sound will go out of sync. I think I just have to capture at a different audio/ video rate.

[DaveS]

this is just speculation on my part (the vegas comments caught my eye since that's what I use for editing), but if you captured w/ a video cap card and the audio went through your sound card or onboard audio, then those two can get out of sync easily. But, you would have seen this when playing the captured video before your editing.

What are you using to cut the movie? If you haven't already, try the womble mpegvcr or mpeg video wizard trial to cut your movie (if needed) as it's supposed to be fairly accurate. (trial is fully functional).

and since you mentioned you are cutting your captures, are you capturing to mpeg? are you then re-rendering in vegas? w/ the transitions, etc. I wonder whether this has anything to do w/ the out of sync you are seeing...pls. post back if you figure this out...

[glamdrac]

I am using an ADSTech DVDxpress to capture directly to mpeg2. The I open Vegas and drop in the clip, add transitions, fades, titles, etc. I do not cut the video before opeing it in Vegas. It goes straight to Vegas. I capture at 6000 Mbps. Is that possibly too high for Vegas to handle? Should I try capturing at a lower bit rate? B.T.W., The entire video is 35 minutes long.



edit: maybe my audio is set too high. I capture at 224 kbps. I think I will be able to give a final answer as to if that is the problem. I am trying something that will tell me for sure. Stay tuned.....

[glamdrac]

I FIGURED IT OUT!!!!!! It was just that Vegas (as well as MediaStudio Pro) does not like my captures. I am not sure though if it is the audi, the video, or both that it does not like. I did an experiment that proved this. I opened the video that has the audio sync problem in Vegas and re-aligned the audio, and rendered it. I then opened the new video and it plays perfectly, thus proving that it does not like my captures. I will capture at the rate that Vegas exports to from now on. That ought to do it. I might just keep capturing the same way, but just run my capture through Mpeg Video Wizard first before trying to edit it with vegas.

[DaveS]

when you have time, it would be worth while to figure out what is in your captures that is throwing things off (and it doesn't seem like its the audio or video rate) and fix the source of the problem

I had a problem w/ my captures from iuvcr in that the frame rate was slightly off, and so I did a work around for a while like yours where I would pull it into vegas, render it as mpeg2 and then use the captures...the render did a great job at cleaning up the framerate but the ultimate fix was to fix the frame rate problem at the source

I can't tell from the web site whether any other capture software would work w/ the dvdxpress but it would be worth while looking at the settings in the ads capture s/w or trying their tech support to see if you can get your program stream to be compliant. good luck and I'm glad you made progress!