I make a 30 second recording using a webcam on a laptop. When I play the .avi file afterwards, the audio and video are out of step. The sound starts arriving about a second after it should do and gets increasingly delayed.
Why is this?
Whilst I am making the recording, I can see the video that is being captured being displayed on the laptop monitor. I can actually get lip synch if I s-p-e-a-k l-i-k-e t-h-i-s.
I clap my hands at the start of the video. When I watch the video afterwards, the sounId is delayed by about a second.
The audio track continues for about ten or so seconds after the video component has finished. (A still image remains in the video player while the voice continues.)
I can fix this problem after the recording (laboriously), but I want to have the recording work properly in the first place.
The webcam is a BisonCam NB Pro integrated into the laptop. It is a 2 Megapixel camera that can record at 15 fps. The CPU is an Intel dual core T4200. The machine has 4GB of RAM. I am saving the recording to a file on a ramdisk, so I don't think the hard drive is the problem. I am using BisonCap to record, the software that came with the computer. I have set recording for 15 fps.