Ronald S. Bultje wrote:
> Hi,
>
> On Wed, 2007-01-02, Andy Brown wrote:
>> So from what you explain, I cannot stop this from causing the device to
>> stop delivering the data and require the device to be closed then re-opened?
>
> You don't need to close it, you just need to re-queue the frame for
> capture. I.e., your _application_ is responsible for handling te capture
> error. The driver doesn't crash or anything, it simply returns an error
> on he sync call, because the next frame could not be delivered (it got
> lost), probably along with a whole bunch of more frames if the
> interference is really bad. Simply discard them and continue queueing
> frames for capture and you should be fine.
>
> (Note, however, that this is the theory; in practice, we never actually
> test that. If you want, we can add a --ignore-frame-errors or so to
> lavrec and see if it really actually works, and fix possible driver
> errors, but that will require some small testing + patching from your
> side.)
Ah, right. Sorry I'm not any good at image programming, so bear with me
on this one! That makes a lot of sense though Ronald.
What I'm getting is the first frame dropped with an:
"sync error in proc 11048: Timer expired"
and then the second attempt:
"mcapture error in proc 11048: Device or resource busy"
error, which are both generated from this piece of code:
vid_mmap.frame = viddev->v4l_curbuffer;
if (ioctl(dev, VIDIOCMCAPTURE, &vid_mmap) == -1) {
motion_log(LOG_ERR, 1, "mcapture error in proc %d",
getpid());
sigprocmask (SIG_UNBLOCK, &old, NULL);
return V4L_FATAL_ERROR;
}
vid_mmap.frame=frame;
if (ioctl(dev, VIDIOCSYNC, &vid_mmap.frame) == -1) {
motion_log(LOG_ERR, 1, "sync error in proc %d", getpid());
sigprocmask (SIG_UNBLOCK, &old, NULL);
}
(I understand this is difficult to understand only seeing a small
portion of the code).
What I'm understanding from you, is that I should be able to change this
so it isn't a fatal error, and continue trying to retrieve frames,
simply skipping the 'bad' ones?
I'll give that a try, as I'd love to get this working! Thanks for your
assistance.
Regards,
--
Andy
w: http://www.thebmwz3.co.uk
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