Continuously filled buffers?

[Ralph Majer <majer (at) vitracom.com>]

Hi all,

I'm currently writing an application which captures from an bttv grabber 
using userptr's (V4L2).

Now I have this problem: When I enqueue three buffers and turn on 
streaming they will be filled with the next three frames. But when I not 
dequeue them and enqueue empty ones continously, these three frames 
could be very old.

Is it possible to set a flag or something else, that the bttv grabber is
always filling up these buffers with the latest frames until I dequeue them?

The only possible way I actually see is using an thread which 
continuously grabs images in the background. But I want to avoid threads 
if possible. How do you ensure always getting the latest frames only?


Best regards
Ralph Majer

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