On Monday 20 October 2008 15:56:35 Alexander Pipelka wrote:
> Hans Verkuil schrieb:
> > On Thursday 16 October 2008 11:09:28 Alexander Pipelka wrote:
> >> Hi,
> >>
> >> I want to capture video streams without any B-Frames
> >> in it from a YUAN MPC622 card (ivtv driver).
> >>
> >> For this I set video_b_frames to 0:
> >>
> >> v4l2-ctl -c video_b_frames=0
> >>
> >>
> >> After that I won't get any output from /dev/video0.
> >>
> >> I know this worked with the drivers version 0.7.4.
> >>
> >> Is this a known issue ?
> >
> > Works fine for me with ivtv from the v4l-dvb repository (ivtv
> > 1.4.0).
> >
> > I think it should work fine as well for ivtv 1.1.0 as I don't
> > remember any changes in this area since that 1.1.0 version. But to
> > verify that you could upgrade to either the 2.6.27 kernel or use
> > the v4l-dvb repository.
>
> Does not work.
>
> I tried the following kernels and version without success:
>
> v4l-dvb mercurial repository
> linux 2.6.27.2
> linux 2.6.26.3
> linux 2.6.24
>
> It worked on Ubuntu Feisty (I think it was the ivtv driver version
> 0.7.4).
Can you run this test for me using the v4l-dvb repository?
As root:
rmmod ivtv
modprobe ivtv
As a normal user:
v4l2-ctl -f <freq>
(freq in MHz; note that you can readback the selected frequency using
v4l2-ctl -F)
v4l2-ctl -c video_b_frames=0
cat /dev/video0 >test.mpg
Now run in another shell:
v4l2-ctl --log-status
Break off the 'cat' command, check that test.mpg is indeed still 0 bytes
and post the output of the v4l2-ctl --log-status command.
Regards,
Hans
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