[mythtv-users] Sound volume from a PVR-500 (v4l)

[Stephen Worthington]

On Tue, 28 Jan 2020 15:44:50 -0700, you wrote:

>The last item on the recovery from my FE/BE blowing 3 caps after Christmas is 
>getting my PVR-500 capturing composite from my Shaw DCT-700 to have a higher 
>volume.
>
>Pre-crash, /dev/video0 was over-loud. Now it's the opposite: too quiet, even 
>jacking up playback volume.
>
>I turned to this method to try to fix it.
>
>http://gedakc.users.sourceforge.net/display-doc.php?name=pvr-volume-too-loud
>
>It involves creating a script to set the volume, and then making it a "Master 
>backend started" System Event.
>
>But it doesn't seem to have an effect and I'm kinda stumped.
>
>Even after I restart mythbackend, and presumably running the script,
>
>  v4l2-ctl --list-ctrls -d /dev/video0 | grep volume | tr -s " "
>
>returns
>
>  volume (int) : min=0 max=65535 step=655 default=60928 value=52400 
>flags=slider
>
>when my script asks for the volume to be 60928. I'm out of ideas and patience 
>to flail on it at the moment.

Does the script need more permissions to set the volume?  Does it work
when run with sudo?