David Frager wrote:
> Several months ago, I started seeing a problem changing between inputs on a
> single video card.
>
> I have 2 channels configured:
> TV_CHANNELS = [
> ('svideo', 'S-Video Input', '0', '', '0'),
> ('composite', 'Composite Input', '-1', '', '1'),
> ]
>
> No matter which channel I selected via "Watch TV", the input would not
> change. I had to issue the change to the input using v4l2-cfg --set-input
> #.
>
> I did find that if I turned on debugging or used the --trace option, the
> inputs did change as expected.
>
> After some addition testing over the weekend, I was able to solve my problem
> by adding a sleep of 1 second in the location identified below. It appears
> that the ivtv_xine plugin sends the change of input request via a write the
> STDIN. My guess is that when the request is send, xine is not able to
> accept this input. The additional 1 second seems to be enough time delay.
>
> if switch_vg:
> # switch to a different video group
> time.sleep(1)
> ivtv_dev = ivtv.IVTV(new_vg.vdev)
> ivtv_dev.init_settings()
> self.xine.SetInput(new_vg.input_num)
> # disable embedded vbi data
> self.embed = ivtv_dev.getvbiembed()
> ivtv_dev.setvbiembed(0)
>
> I have this working in my local environment, and would like to see some
> permanent solution included in the build environment.
Thanks for this, some good tracing of the problem. I only wonder if a 1
second delay is okay in all cases.
The ivtv driver is a bit fussy about changing standards and inputs, the
video stream needs to be switched off and restarted again. I'm not sure
if the xine does this, if it doesn't then this may need to be fixed in
the ivtv module.
Cheers
Duncan
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