I'm using Sony Vegas home platinum 10 and I am having a hard time with a project for which I can find no answer.
My project is 20 minutes long. It's an AVCHD raw file, and there are lots of cross fades and effects used throughout. The audio lines up perfectly in the timeline and plays perfectly. But after rendering, the audio lags by just a fraction of a second but makes the video useless for what I'm doing.
Strangely, if I select a small area of the video and render it, the audio and video are synced perfectly.
It only goes awry when I render the whole movie.
Last night I copied and pasted the movie into a new Vegas window, converted the audio to one .wav file instead of many cut pieces, and replaced the audio with this one file. Again, works perfectly in the timeline and works perfectly when I render just a small part of it, but when I render the whole thing, same problem.
I'm rendering to .wmv but I know it's not windows movie player causing the problem because I uploaded to YouTube privately and the sync issue is still there. I just don't understand why rendering a small part is absolutely fine but not when I render the whole thing. I have minimal programs pushing up the CPU.
If anyone can help I'd be so grateful. My project settings match my media format and the render settings are ones I have always used without problem (I'm writing here on iPad and can't attach photos).