I need to record video+sound together and save the result to a file, and I would like to be able to play the file back as well.  I have yet to find a solution which makes this easy. Actually, I have yet to see a complete solution at all.  With GSVideo, I was able to record the video and audio separately.  Then I could play them back separately as well, but then there were synchronization issues, such as the video playing back faster than the audio.  Also, there were buffering issues while recording, even at 15 FPS---this should not be the case, I have a fairly new laptop.

So:

   How can I record video and sound in a single file?