[mythtv-users] Indoor HD antenna question

[John Pilkington]

On 14/04/18 09:40, Stephen Worthington wrote:
> On Sat, 14 Apr 2018 09:01:11 +0100, you wrote:
> 
>> On 14/04/18 05:23, Stephen Worthington wrote:
>>> On Fri, 13 Apr 2018 20:32:52 +0000, you wrote:
>>>
>>
>>>
>>> The "demux0  dvr0  frontend0  net0" devices are all correct for a
>>> normal DVB or ATSC tuner.  What we are not sure of now is if they all
>>> work correctly.  Trying the "scan" command should tell us whether the
>>> tuner works at a basic level, and then if that works, once scan has
>>> created a channels.conf file, that can be used with an "azap -r
>>> <channel name>" command to tune the tuner to one channel and make that
>>> play on the /dev/dvb/adapter0/dvr0 device.  You leave azap running and
>>> in another command prompt run a command line player program like
>>> mplayer to play from the dvr0 device:
>>>
>>> mplayer /dev/dvb/adapter0/dvr0
>>>
>>> Mplayer should pop up a window and play the channel.  It will also log
>>> to the console to show what is happening, and tell us what went wrong
>>> if it can not play the channel.
>>
>> The centosplus kernel is, IIRC, an el6 kernel with extra drivers for
>> non-el-type stuff like multimedia.  The current kernel is
>>
>> http://mirror.centos.org/centos/6/centosplus/x86_64/Packages/kernel-2.6.32-696.23.1.el6.centos.plus.x86_64.rpm
>>
>> with a build date of 2018-03-14, probably for the spectre security fix.
>>
>> Your dmesg shows
>>
>> Linux version 2.6.32-220.17.1.el6.centos.plus.x86_64
>> (mockbuild at c6b5.bsys.dev.centos.org) (gcc version 4.4.6 20110731 (Red
>> Hat 4.4.6-3) (GCC) ) #1 SMP Wed May 16 05:20:13 BST 2012
>>
>> I doubt that saa7134 stuff has been updated much since then, but
>> you probably ought to think about doing some updating, anyway :-)
> 
> 2.6!!!! Is that really the kernel version?  That is ancient!  There
> has been a lot of development of V4L since then, so I hope it has
> updates for that.  My Mythbuntu 16.04 LTS is running
> 4.4.0-119-generic, and that is quite old - the new 18.04 LTS build is
> due out in a few days and will be running 4.15.
> 
> Not to mention that a kernel that old will not run SSDs properly (no
> TRIM), and will not run NVMe SSDs at all.  And will likely not work
> with shingled drives like my 8 TByte Seagates.  And will not work
> properly with new CPUs like Ryzens.

Well, yes.  He did say it was an old system, and for some uses that 
might not be a problem - but changes of use can be difficult.

The el kernels aren't 'generic' and have updates by RH, but AIUI those 
are mainly server-related.  I'm running el7 with 4.4.125 from elrepo 
(for better dvb support, standard is 3.10.0-693) and f26 with 4.15.15