Thanks everyone for their pointers, Gerd: Yes I am using 0.7 at the moment which would explain why reading didn't work. ========= Puneet: thanks I've now found an HTML version : http://kernelnewbies.org/documents/kdoc/videobook/v4lguide.html its written from the driver writers point of view but is still useful/interesting when using an existing driver. ========= On Thu, 17 Apr 2003, Charlie Liu wrote: > This might help too: > http://www.glue.umd.edu/~ankurm/video4linux/introduction.html yes thanks I've decided to switch to using mmap, and this page seems to give a nice brief example. ========= Again thanks for all the replys Martin