[mythtv-users] HVR-950q analog/NTSC capture has no sound

[James Miller]

On Fri, 10 Feb 2017, Hika van den Hoven wrote:

> udevadmin info --attribute-walk --name=/devdsp1
> and
> udevadmin info --attribute-walk --name=/devdsp2
>
> gives you more info on the nodes

Thanks for those tips, Hika. The commands are not quite accurate as 
written but it was pretty easy to figure out what changes needed to be 
made (udevadm and forward slash after /dev). I actually used those 
commands to craft some udev rules that should help me keep these two cards 
properly enumerated for sound purposes (followed directives I found at 
http://alsa.opensrc.org/Udev under the sub-heading "Identify two identical 
audio devices").

Now that I've rebooted, I'm bumping into another minor issue. For some 
reason, every time I reboot and/or power-cycle the machine, only one of 
the HVR-950q NTSC tuners gets detected and configured: only video0 appears 
under /dev (that's not the one through which I'm trying to record analog 
audio/video). It's an easy fix: all I have to do is unplug and re-plug the 
second HVR-950q from/to the usb cable and immediately video1 appears, 
along with the udev symlink I've created for it, under the /dev directory. 
I'm not sure why I cannot get the system to detect and initialize both of 
these tuners on boot/re-boot; perhaps this is an indication that I need to 
compile snd-usb-audio into the kernel? Or maybe there's a kernel parameter 
to be specified? For what it's worth I have no initramfs and simply use 
the kernel's built-in command-line to boot this system. Probably something 
I'll need to inquire about on the Gentoo forums.