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video speed

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 Hi,

I'm playing video and saving to a  avi file at the same time. Since saving the file is very time demanding I just do it in separate loops. I also cut the video files so I do not have problems with resulting avi file size. My cameras can record up to 20 fps, when I acquire at 5 , 10 , 15 fps, things seem to go OK. The problem appears when acquiring at 20 fps: some of the files obtained (it cuts the recording into 30 seconds video files) are OK, but some are not. 

Those which are not OK seem to have random speed, they are accelerated for a while, then back to normal speed, then again accelerated...quite wierd...Any suggestions?

Thanks


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