Hi List,
I'm trying to capture video at a framerate lower then 25 fps, but something
seems to be wrong with the way I'm doing this.
I'm using the streaming I/O (Memory Mapping) method to capture frames with
the bttv2 driver. I'm queing buffers at a framerate of 10 frames per
second (realtime thread, SCHED_FIFO) with the VIDIOC_QBUF ioctl. I expect
the frames to be captured evenly distributed over time, but it seems that
this is not the case. When I look at the timestamps of the captured frames,
they are 'clustered' or 'bursty'.
With a little picture : (X marks the frame)
This is what I want :
X X X X X X X X ----> time
But this is what I get
X X X X X X X X ----> time
(I hope the idea is clear)
The video is now shocky; motion comes shocky and in bursts.
Is this the proper way of grabbig with reduced framerate ? And if so, is
there anything special I should do to get the frames more evenly distributed
through time ?
Regards,
/Ico
--
:wq
^X^Cy^K^X^C^C^C
