[linux-dvb] Re: xawtv-3.88 with SAA7146(KNC1)

[Michael Hunold <hunold@convergence.de>]

Hello Doug,

> anyways, Yes, I finally figure it out mine is a KNC1, and luckly looks
> like almost working. see!
> #lsmod
> Module                  Size  Used by
> dvb-saa7146            75136   0 
Some background informations: the KNC1 is a budget card (ie. it has no 
mpeg decoder on it, so you can only get the raw transport stream out of 
it), but it has a analog video decoder, so you can get analog video (ie. 
vcr, analog camera) into your machine.

AFAIK the LinuxTV.org official "DVB" driver has very limited KNC1 
support build in -- I don't know it if works at all.

You should try the Metzler Brother's version of the DVB driver, because 
they have should have better KNC1 support build in.

Alternatively, you could get the LinuxTV.org "dvb-kernel" driver and try 
that one out. When I separated the different drivers (full-featured, 
budget, budget + analog video) I copied the KNC1 stuff from the Metzler 
driver. It *should* work, although I haven't tried it because I don't 
have such a card.

So you could to the project a real favour if you'd try the "dvb-kernel" 
driver out. You can compile and use it with 2.4, too, simply have a look 
at the README.

> I don't try xawtv any more instead I ran zapping compiled and insalled,
> but for some reason I got some error saying
You should get "xawtv" to run first. It's the application that most 
developers use.

The problem is, that with "DVB" driver and the "old" Video4Linux-1 
interface, things were very card-specific, ie. most programs expect the 
card to behave like a bttv card. "zapping" triggers many of these bugs, 
some of them have been addressed lately by users.

I don't work on the DVB driver any more, so it's up to the users to fix 
this.

The "dvb-kernel" driver, however, features Video4Linux-2, which is more 
cleanly specified. This works flawlessly with "xawtv", I must admit that 
I haven't tried "zapping" with v4l2 yet.

> "zapping_setup_fb:v4l25.c:61: VIDIOC_QUERYCAP ioctl failed," and the
> whole debug message is below. :)
>
> Opening device '/dev/video0'.
> Querying device capabilities.
> -1 = VIDIOC_QUERYCAP(), errno = 22, Invalid argument
> zapping_setup_fb:v4l2.c:162: VIDIOC_QUERYCAP ioctl failed,
>   probably not a V4L2 device: 22, Invalid argument.
That's no problem here. "zapping" issues an Video4Linux-2 ioctl to see, 
if the device supports v4l2. Apparently it does not, so the ioctl fails 
and "zapping" goes on...

> Opening video device.
> Opening device '/dev/video0'.
> Querying device capabilities.
> 0 = VIDIOCGCAP(name="DVB Board"
> type=CAPTURE|TUNER|!TELETEXT|OVERLAY|!CHROMAKEY|CLIPPING|FRAMERAM|SCALES
> |!MONOCHROME|!SUBCAPTURE|!MPEG_DECODER|!MPEG_ENCODER|!MJPEG_DECODER|!MJP
> EG_ENCODER channels=2 audios=2 maxwidth=768 maxheight=576 minwidth=32
> minheight=32)
> Using V4L interface.
... and uses the v4l interface instead.

> Checking overlay capability.
> Getting current FB parameters.
> 0 = VIDIOCGFBUF(base=0xd5800000 height=600 width=800 depth=16
> bytesperline=1600)
> Setting new FB parameters.
> 0 = VIDIOCSFBUF(base=0xd5800000 height=600 width=800 depth=16
> bytesperline=1600)
> Setup completed.
> Line 603, routine main
> Line 606, routine main
> tvengxv.c: XVideo major_opcode: 143
> TVeng: [tveng25.c] p_tveng25_open_device_file (line 142)
> VIDIOC_QUERYCAP failed: Invalid argument
> TVeng: [tveng2.c] p_tveng2_open_device_file (line 112)
> VIDIOC_QUERYCAP failed: Invalid argument
> DGA info:
I don't know why "zapping" tries to use the v4l2 interface again...

> Does anyone have an idea how i can dodge the muddle? Did I miss some
> kernel options enabled? 
See above. Either try the Metzler driver (will probably work) or 
dvb-kernel (will probably not work, but help is appreciated)

CU
Michael.




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