Chris Barnhart wrote:
>
> I am also trying to do double buffering with mmap, v4l and bttv at 30 fps.
>
> I'm queueing two frames with VIDIOCSYNC ioctl and am able to get the code
> to grab and display at 30 fps when I queue and sync correctly. However -
> although the loop rate is 30 loops per second, I am seeing the same image
> twice in a row. I've tried display the data at locations bigbuff, and
> bigbuff + image_size. The later case is always an empty (black) image.
>
> How do you specify where the driver should place the data?
>
> Thank you in advance,
> Chris Barnhart
>
> -------
> Gleicon S. Moraes wrote:
>
> >Hi !
> >I've edited and uploaded that example you sent to us Justin. Added some
> >comments .
> >URL:
> >http://planeta.terra.com.br/informatica/gleicon/video4linux/videojustin.c
> >
> >regards
> >
> >--
> >Gleicon S. Moraes
In the example you quoted, the image is at:
bigbuf + vm.offsets[frame];
-justin
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