webcamd, dvb, v4l2-ctl: "device not configured"

[Hans Petter Selasky]

On 02/21/15 03:30, Da Rock wrote:
> I'm trying to get something happening with ffmpeg and using the v4l
> input to access a dvb card - which may well be trail blazing mind, but
> there are points worth testing. However, it keeps coming back to me that
> the device is not configured. Mplayer as such will work using dvb://
>
> I'll be the first to admit that I'm not exactly an expert in the v4l
> field (which is why I'm here). What I want to know is how I can tune the
> card so that ffmpeg can then play with the stream. I know that it use
> the v4l libraries and as such based on what I have read in the man and
> docs says that "in theory" I should be able to control the card using
> this. So I'm playing around and trying various tricks, but nothing is
> working.
>
> I tried v4l2-ctl and it shows up my webcam just fine, but it shows
> nothing else. If I then go -d /dev/dvb/adaptor0/frontend0 and use --all
> or -D all I get is:
>
> VIDIOC_QUERYCAP: failed: Device not configured
> Driver Info (not using libv4l2):
>      Driver name   :
>      Card type     :
>      Bus info      :
>      Driver version: 0.0.0
>      Capabilities  : 0x00000000
>
> So I'm mystified. Is this supposed to work? Or is it a loose thread on
> the linux compat side like notify?
>
> Aside from attempting to get a tzap built (could anyone explain how to
> adjust the szap Makefile in ports to do this? Change the name from
> szap_s2 to something else maybe?) is there any other way to tune the
> card? Preferably using perl, which would ultimately be the tool I'd use
> to setup my system.
>
> I've tried near all the media systems, but frankly none meet my
> satisfaction. Too complex, too unstable, (too lumpy, too bumpy - sound
> like a Suess story :) ) just not light enough or suitable for the
> environment. So I'd like to build my own without all the cruft - one
> I've had in mind for some time now. Hence this endeavour. Prior there
> was no ffmpeg with v4l, ffserver had faults, went to avserver but it
> needed rebuilding from scratch. Now ffmpeg has v4l I thought I'd kick it
> in the guts again and see...
>

Hi,

I think libv4l2 is not used for DVB access.

--HPS