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How to redirect and use the framebuffer?

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linux-howto

http://unix.stackexchange.com – I need to work on the framebuffer to record what is being rendered. Now, i figure out how to convert the framebuffer in an image, i'm currently unable to obtain a constant stream of data from the fb to create a video. /dev/fb > fb when i do something like this my redirection just drops me and i honestly don't know how to work in another way with the framebuffer. how i can obtain a stream ? (HowTos)