On Thu, 2008-10-16 at 17:41 +0200, Hans Verkuil wrote:
> 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.
> 

I can confirm what Alexander said: 

v4l2-ctl -c video_b_frames=0  (no stream saved, although nothing
                               appears in the syslog which would
                               indicate a problem)


v4l2-ctl -c video_b_frames=1  (the stream is saved OK)

All of this with the latest kernel (2.6.27) and a Hauppauge WinTV PVR-150 MCE 
(the version without radio tuner but with a MCE remote control).

Levente

PS: BTW it didn't work with ivtv 1.1.0 as well (or was this 0.10.x, it happened 
about half a year ago).



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