[pvrusb2] Using sysfs to change the input setting and capturing the mpeg stream

[Aaron Newcomb]

Thanks, Mike.

I think my problem was trying to use vi to edit the file instead of
just doing ...

echo "s-video" >cur_val

Once I did that it worked fine. However, I get terrible static sound
in mplayer when I do that. I also get it when I use cat to capture the
video. I am not using audio at this point so it's not that big of a
deal, but is there a way to get rid of that static? Also, does anyone
have any tips on sharpening up the video? I am guessing my options are
probably limited here because of the analog signal.

On 7/31/06, Mike Isely <isely at isely.net> wrote:
> On Mon, 31 Jul 2006, Aaron Newcomb wrote:
>
>     [...]
>
> > You can see above the the input is set to Composite 4. Can I use the
> > sysfs interface to change that to s-video??
>
> From the viewpoint of the saa7115, there is no "s-video" input.  For that
> chip there's just some set of numbered inputs.  The wiring of those inputs
> on the chip to the actual jacks on the device is knowledge only held by
> the pvrusb2 driver.  So when you use sysfs to change the input to
> "s-video" (or whatever, and yes you can do that), then the input as
> reported by the saa7115 is just going to be whatever numbered choice
> corresponds to that.
>
> To change the input in sysfs, look at the ctl_input control and put into
> "cur_val" one of the choices that you can see from cat'ing the enum_val
> file.  (You probably already know all that; I'm just trying to cover all
> the bases here).
>
> >
> > Also, once I get s-video working what is the easiest way to record the
> > mpeg stream from the command line?
> >
>
> cat /dev/video0 >my_file_that_i_want_to_save_to.mpg
>
> Note: I am out of town right now (actually typing this from inside a
> restaurant with free wi-fi).  Where I'm heading won't have broadband, so
> my responsiveness here for the next week or so is going to be somewhat
> sporadic.
>
>    -Mike
>
>
>
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-- 
Thanks,
Aaron