massimo massa wrote:
>
> I'm using the Bttv-V4L2 driver for a video-recording project: I make a 5
> minutes recording then I exit the program, wait some seconds, make
> another recording and so on. Doing this I encounter the following
> problems: each time I restart the recording the driver issues messages
> like the following ones:
> May 24 16:30:01 urania kernel: V4L2: Fault on write ioctl 0x40045613
> copying data from user buffer
> May 24 16:30:02 urania kernel: bttv_v4l2: Warning- munmap() called while
> streaming
> This seems apparently not affecting the normal behaviour of the program
This is OK
> but after a variable number of recording the driver issues messages like
> these:
> May 24 11:08:02 urania kernel: bttv_v4l2: IRQ -> SCERR
> May 24 11:08:02 urania last message repeated 14 times
This is the problem
> May 24 11:08:02 urania kernel: bttv_v4l2: Warning- munmap() called while
> streaming
> May 24 11:08:02 urania kernel: bttv_v4l2: risc_irq not responding ->
> doing it the hard way
> In this case the system becomes very very slow and sometime it's
> impossible continuing to record images.
> I think I forgot to make some routines call for stopping the risc
> machines in a clean way before closing the driver or something about
> this but I don't know exactly what I have to do.
> Any hints?
> Thanks in advance.
> Massimo
The problem is those SCERR messages, which usually mean that the
incomming video signal is bad. When this happens, a lot of interrupts
are generated, which slows down the PC. Make sure your video signal is
clean. If it is and you still get these problems, please send me
another e-mail.
-justin
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