Simple pixel based motion detection - help

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Hi,

I'm new to OpenCV and have only been running R scripts for statistical tests, hence sorry if I'm asking too basic questions.

I have video files in .ASF format (Video Codec : MPEG4-SP ASF File Format), the video clips last for c. 5 seconds (PAL: 10fps at a resolution of 704 x 560).

For each video file I wish to measure the average and maximum pixel change caused by a moving object during the 5 seconds long video. I have tried to search the web but haven't found a tool for this.

Hope someone here could help.

Best regards, Roste