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
