Dear Pierre-Eloi Could you let drop a ball let say 1 meter and record this at 90 fps using the drivers provided with your webcam?
using: y=(1/2)g t**2 and puttting y=1m, g=9.8 you can get t, the time that your ball will take to get to the floor, then if the cam is doing 30 fps you would end up with 13 frames of the ball, but if the cam is doing 90 fps you should obtain 39 frames! when you record a video at higher speed than supported, some cams just send duplicated frames, you could check this using: ffmpeg -an -sameq -i yourmovie.avi photo%03d.jpg and watch the image sequence. Yesterday I downloaded a video (from youtube) recorded with this cam of some cars in a crossing, but a crude calculation let me think that is only 30 fps. If you record this video, could you send it to me? Have you think on the possibility that the images from the webcam are interlaced? Good luck, Francisco _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
