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

[R. G. Newbury]

On 02/10/2017 05:48 PM, James Miller wrote:
> On Fri, 10 Feb 2017, James Miller wrote:
>
>> On Fri, 10 Feb 2017, R. G. Newbury wrote:
>>
>>> It's a little off the wall, but try plugging the two units into USB
>>> sockets *which are on different hubs*. Say, one on a rear socket and
>>> one on the front of the box. It is quite possible that the usb
>>> sub-system is getting confused about the number of units actually
>>> available *on one hub*, since they obviously have the same usb
>>> identifier.
>>
>> Thanks for the suggestion, Geoff. Sounds worth a try, though I'll have
>> to do some strategizing to implement it. First, I'm not sure this box
>> has more than one hub built in: this is a Liva X with only 3 USB
>> ports. I suppose it might nonetheless be worthwhile checking whether
>> plugging one or other of the HVR-950q's into a different USB port
>> might have an effect.
>
> Sure enough, by playing a bit of musical usb ports, I was able to cause
> the system to reboot/power-cycle with both tuners fully initialized and
> even in conformance with my udev rules (well, ok, I had to revise the
> alsa udev rules a bit). I'm reluctant to describe what worked since I
> don't really understand why it did; it will be unlikely to work in the
> way described on a different system and I'm also not certain it will
> continue to work here--though it has so far through 2 power cycles. What
> will happen if/when I will compile a new kernel, for example? I guess
> we'll have to see, should that eventuality transpire.
>
> Anyway, I plugged the behaving HVR-950q into the port where the flirc
> formerly was inserted (directly into the Liva). I left the miscreant
> HVR-950q plugged into the external USB hub, though in a different port
> on that hub. On booting the computer, everything came up just as I'd
> been expecting, with no need for any unplugging/replugging of usb
> capture cards to get both operational and recognized by myth.
>
> I thought enumerating and naming of usb devices might have become more
> coherent at this stage in the 21st century, but I guess it hasn't. Go
> figure. Back to boning up on slot-conflict resolutions for me.
> _______________________________________________

Had should have read this first.

Great minds....etc./

Geoff