If you import your audio file back into your Cubase project, does the corresponding audio file end before the right locator? If so, is it cropped in the beginning or end of the file?
Is the project frame rate set accordingly to the same as the video file. Cubase should warn you if there’s a discrepancy but I don’t know if it’s rock solid.
You say you export your audio so I assume you’re trying to merge or playback the video and mix in another program, is that program playing back the video with the correct frame rate?
Approx 8m30sec ≈ 510sec
1sec 22f in 30fps ≈ 1.73sec
511.73 / 510 ≈ 1.0034 which would translate to a frame rate difference of roughly 0.1f at 30fps but that’s nonstandard. I’m beginning to think there’s something simpler (or harder).
BTW, thanks, you got me off my ass to install Quicktime on my new system!
Edit: Ok, for none of the test video files I tried did Cubase show any signs of displaying erroneous lengths due to fps mismatch so no luck there. Tried dragging some audio in there, mark the video file, hit ‘P’, export audio and import into project, no problems.
What about audio sample rate, are you sure everything is green there as well?