[mythtv-users] Hauppauge 2255 dual tuner?

[Stephen Worthington]

On Wed, 25 Sep 2019 08:33:39 -0500, you wrote:

>Greetings,
>
>I own a Hauppage WinTV-HVR-2255. It claims to be a dual tuner and thus be
>able to record two shows at once [1].
>
>I can successfully record one show at a time, but am wondering about any
>configuration changes or pitfalls for dual recording.
>
>Has anyone had success recording two shows at the same time with Myth with
>the aforementioned hardware?
>
>I'm running a pretty old version of Myth...
>
>0.27.5+fixes20151228-dmo1
>
>Here are some snippets about my tuner hardware from my system
>
>lspci fragment:
>02:00.0 Multimedia controller: Philips Semiconductors SAA7164 (rev 81)
>        Subsystem: Hauppauge computer works Inc. Device f111
>
>dmesg fragment:
>[   11.839458] saa7164 driver loaded
>[   11.839614] CORE saa7164[0]: subsystem: 0070:f111, board: Hauppauge
>WinTV-HVR2255 [card=12,autodetected]
>[   11.839619] saa7164[0]/0: found at 0000:02:00.0, rev: 129, irq: 16,
>latency: 0, mmio: 0xfb800000
>[   11.997809] saa7164_downloadfirmware() no first image
>[   11.997875] saa7164_downloadfirmware() Waiting for firmware upload
>(NXP7164-2010-03-10.1.fw)
>[   12.638445] saa7164 0000:02:00.0: firmware: direct-loading firmware
>NXP7164-2010-03-10.1.fw
>[   12.638452] saa7164_downloadfirmware() firmware read 4019072 bytes.
>[   12.638453] saa7164_downloadfirmware() firmware loaded.
>
>Does anyone have any thoughts, hints, or advice about dual recording?
>
>Thanks!
>
>-m
>
>[1] http://www.hauppauge.com/pages/products/data_hvr2255.html

If it is a dual tuner, then normally you should see two separate tuner
devices.  Take a look at the kernel output for the HVR-2250 here:

https://linuxtv.org/wiki/index.php/Hauppauge_WinTV-HVR-2250

The crucial bits are these, where the two new adapters are registered:

[   20.699512] DVB: registering new adapter (saa7164)
[   20.699542] DVB: registering adapter 0 frontend 0 (Samsung S5H1411
QAM/8VSB Frontend)...

[   23.399813] DVB: registering new adapter (saa7164)
[   23.399838] DVB: registering adapter 1 frontend 0 (Samsung S5H1411
QAM/8VSB Frontend)...

So for the HVR-2250, I would expect to see two adapters under the
/dev/dvb directory, like these for my DVB-T adapters:

root at mypvr:~# ll /dev/dvb
total 0
drwxr-xr-x 18 root root  360 Sep 24 17:35 ./
drwxr-xr-x 22 root root 5700 Sep 24 17:36 ../
drwxr-xr-x  2 root root  120 Sep 24 17:35 adapter0/
drwxr-xr-x  2 root root  120 Sep 24 17:35 adapter1/

Does the HVR-2255 do the same?  If so, they in MythTV you can just set
up each of those devices as separate tuners and they should just work.

And as well, multirec should work, so you should be able to record
from all the channels on one frequency at once, using just one of the
two devices.  You need one tuner per frequency, not one tuner per
channel.