BTTV is probably overkill unless you are using very large buffers.
> I didn't see any obvious limitation on size in the source (or through
> man mmap()), but I am planning on doing ~30Mb using this. Is that a
> problem?
The simple way its generally about 64K. The bttv approach its basically
infinite providing you can do scatter gather DMA or land your packets
suitably (eg on 2K boundaries 2 per page)
Alan
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