I've just experience a weird problem.
I have a music video project where I'm trying to synch a separate soundtrack with my video. The soundtrack was apparently recorded with a device with a slightly different clock speed than my camera so I had to stretch the audio event slightly to get it synched. That seemed to work fine. When I play back the project in Vegas, it looks and sounds terrific.
Then, I went to render the project in preparation for authoring a DVD. I rendered the audio to ac3 using Vegas 4.0a. I then authored and burned the DVD in DVD Architect. I was dismayed to discover that the stretching of the audio track didn't seem to make it into the DVD. When I view the DVD, the audio is not synchronized and it seems to be off exactly the amount it was off before I stretched it.
So, I figured, I must have made a mistake and not saved the project with the stretched version of the audio. But, when I went back into Vegas, the audio was stretched and synchronized just like I wanted it.
Just to check if I'd made some other mistake, I rerendered the audio to ac3 again to a different file. Lo and behold, the new ac3 file is less than half the size of the original one!
I then realized that I had installed the update to Vegas 4.0b before rerendering. I figure that must have caused the file size difference.
I am left with several questions:
Can anyone explain why my audio stretching was lost when I rendered to ac3 the first time?
Why is the new ac3 file smaller? Is the ac3 compressor in 4.0b different? I didn't see any mention of that in the list of changes in the update.
Does my new ac3 file probably contain the stretched audio? (I haven't reburned the DVD to check yet.) If not, what can I do about it?
Thank you very much.
David Liebtag
I have a music video project where I'm trying to synch a separate soundtrack with my video. The soundtrack was apparently recorded with a device with a slightly different clock speed than my camera so I had to stretch the audio event slightly to get it synched. That seemed to work fine. When I play back the project in Vegas, it looks and sounds terrific.
Then, I went to render the project in preparation for authoring a DVD. I rendered the audio to ac3 using Vegas 4.0a. I then authored and burned the DVD in DVD Architect. I was dismayed to discover that the stretching of the audio track didn't seem to make it into the DVD. When I view the DVD, the audio is not synchronized and it seems to be off exactly the amount it was off before I stretched it.
So, I figured, I must have made a mistake and not saved the project with the stretched version of the audio. But, when I went back into Vegas, the audio was stretched and synchronized just like I wanted it.
Just to check if I'd made some other mistake, I rerendered the audio to ac3 again to a different file. Lo and behold, the new ac3 file is less than half the size of the original one!
I then realized that I had installed the update to Vegas 4.0b before rerendering. I figure that must have caused the file size difference.
I am left with several questions:
Can anyone explain why my audio stretching was lost when I rendered to ac3 the first time?
Why is the new ac3 file smaller? Is the ac3 compressor in 4.0b different? I didn't see any mention of that in the list of changes in the update.
Does my new ac3 file probably contain the stretched audio? (I haven't reburned the DVD to check yet.) If not, what can I do about it?
Thank you very much.
David Liebtag