Audio out of synch in 2 ways

[yeehi]

I am testing my hardware. I do a 30 second audio/video recording using the webcam on my laptop. After a couple of seconds, I clap my hands to see if the audio is in time with the video. Then I speak 10 words slowly and clearly with silence in between the words.

1) The sound for the clap of the hands arrives too late. (by 17 frames)

I find out how much the sound is late and then cut this amount out from the beginning of the audio track. This gets the clap in synch with the video.

2) The audio is too slow for the video. The lips on the video are out of synch with the words.

I accelerate the audio to %135 and this brings all the audio into synch with the video but then there is a silent part at the end of the video as there is no sound track left there, as the sound track has been shrunk. Also, the pitch of the voice goes up, making me sound like Mickey Mouse. I have to edit the pitch of the audio track, knocking it down one notch, which makes it sound normal again.

Why does the .avi file I create have audio out of synch? What am I doing wrong in my recording?

I am saving the audio/video from the webcam onto a pre-allocated file space on a RAM disk, so that an unresponsive hard drive can't be the problem. I am using BisonCap to capture the audio/video - maybe that is the problem? I have set the recording settings low, 320x240, 30fps, 44.100kHz 16 bit Mono. The camera itself is built in - a BisonCam NB Pro.