I shot a QuickTime movie on my late 2008 MacBook Pro running Mac OS X 10.7.5.
I have downloaded and installed Blender 2.67b
I imported the QuickTime movie into Blender and the video plays back more quickly than the audio.
What can I do that will get the video and audio to synchronize properly.
Ensure the fps in the render settings match the fps of the video you import
Blender 2.68 just came out and I upgraded to that. I’m still having problems. In the dimension section of the default view I set the frame rate to the rate reported by QuickTime when it had the movie loaded. I imported the movie. The audio track is 1.05467552376086 times larger than the video track, so thing are still out of synch.
I’m wondering if there is any way I can adjust the video so it will be the same length as the audio. I don’t know if I can use a frame rate with a factional component in the render settings to make things more accurate or would that affect both audio and video and things would still be off anyway.
I figured out how to get the audio and video to synchronize. I took the number of frames for the audio and divided it by the number of frames for the video. I then set the frame rate to custom and apply the frame per second value give by QuickTime for the movie. I then took the ratio I had calculated from dividing the audio frames by the video frames and applying that to the frame rate base field that appear under the custom frame rate value. That got everything to synchronize.
I don’t understand why the audio and video are out of synch, initially. This is a big problem because I want to combine this movie with another movie I shot using the exact same hardware. When I import that second movie into Blender it works find without having to adjust the frame rate base.
This means that I have two different movies that Blender thinks are recorded at different frame rates, even though they were shot with the exact same hardware in the exact same way. I don’t understand why Blender thinks the frame rates are different, and there doesn’t seem to be any way to combine the movies because no matter what frame rate I set, one of the movies will be out of synch.
This is creating a frustration situation, because a situation that should have been relatively simply and straight forward has turned into something that is excessively difficult and maybe impossible.
What can be done so the movies can be combined successfully?
I’ve concluded the problem is with QuickTime and not with Blender. I tried converting the original recording to a mobile format and the conversion ended up with the same frame rate I had to use in Blender instead of the original frame rate.
I don’t know why QuickTime made that recording at an odd frame rate.
Anyway I was able to solve the problem by converting both recordings using iMovie. Even though I’m trying to do what should be a simple edit project, iMovie just won’t handle what I want to do, and Blender seems the only tool I have available that could handle things. Fortunately iMovie was able to convert both recording to the same frame rate, and I was finally able to perform the editing I needed in Blender.
You implied that you used your laptop as a camera instead of using an actual camera. You can end up with weird frame rates when you “shoot” movies using screen capture software. Those little cameras that come with laptops are not very impressive.
At work they passed around a laptop to do some candid shots and I got the mess that was the result of that. The frame rates were all over the place even from the same exact laptop.