Re: saa7134_empress standard vs input

[Hans Verkuil <hverkuil@xxxxxxxxx>]

On Friday 05 September 2008 00:06:00 Gordon Smith wrote:
> On Thu, Sep 4, 2008 at 12:22 AM, Hans Verkuil <hverkuil@xxxxxxxxx> 
wrote:
> > On Wednesday 03 September 2008 23:48:39 Gordon Smith wrote:
> > > Greetings -
> > >
> > > I have a RTD Technologies VFG7350 (saa7134 based, two channel,
> > > hardware encoder per channel, no tuner) running current v4l-dvb
> > > in 2.6.25-gentoo-r7.
> > >
> > > Short form question: Is it necessary to do something to connect
> > > an input standard to an MPEG encoder?
> > >
> > > I seem to have a disconnect between input signal and the MPEG
> > > encoder. In this case, there is a NTSC camera signal on the
> > > input. Raw data and input selection are on video0. Raw data can
> > > be read from and input selected on video0. MPEG encoder output is
> > > on video2. MPEG data can be read from video2, but it looks like
> > > PAL aspect with NTSC data (extra lines at bottom of image repeat
> > > uppermost lines).
> > >
> > >
> > > $ v4l2-ctl --get-standard --device /dev/video0
> > > Video Standard = 0x0000b000
> > >         NTSC-M/M-JP/M-KR
> > > $ v4l2-ctl --get-standard --device /dev/video2
> > > Video Standard = 0x000000ff
> > >         PAL-B/B1/G/H/I/D/D1/K
> > >
> > >
> > > The input standard is automatically selected by the hardware.
> > > Is there something that needs to be set to match the standard
> > > between input and encoder?
> >
> > I suspect I know what is wrong. After loading the driver
> > run 'v4l2-ctl -s ntsc-m' and see if the capture now works. Ignore
> > the standard as reported by video2: it's bogus and is unused.
> >
> > What I believe is happening is that the saa6752 is never told that
> > the standard is NTSC when it is loaded the first time. But if you
> > set it explicitly afterwards, then it probably works.
> >
> > Let me know what happens. If it is indeed a bug then I'll fix it.
>
> I set the standard as above as well as just "ntsc" on another
> attempt, but the the capture is still PAL size.
>
> {{{
> $ v4l2-ctl -s ntsc-m --device /dev/video0
> Standard set to 00001000
> }}}

Hmm, I'd expected that to work. I'll have to test this myself during the 
weekend.

Regards,

	Hans

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