[mythtv-users] Reducing resolution/bitrate of recordings?

Nick Rout nick.rout at gmail.com
Sat Nov 3 07:20:02 UTC 2012


On Sat, Nov 3, 2012 at 8:18 PM, Nick Rout <nick.rout at gmail.com> wrote:

>
>
>
> On Sat, Nov 3, 2012 at 8:08 PM, Lee Maisel <maisel at lobo.net> wrote:
>
>> Nick Rout wrote:
>>
>>
>>>
>>>
>>> On Sat, Nov 3, 2012 at 7:28 PM, Lee Maisel <maisel at lobo.net <mailto:
>>> maisel at lobo.net>> wrote:
>>>
>>>     I'm trying to get some performance gains.   Currently, there are
>>>     some artifacts/sound pauses (annoying)  Not surprising when
>>>     multiple recordings are going, and they are typically 8GB in size.
>>>     I read in the optimization wiki a mention of reducing the
>>>     recording sizes, but there was no instruction as how to do so!
>>>
>>>     I assume that by doing this, I would:
>>>
>>>     reduce disk usage
>>>     decrease network traffic
>>>     reduce CPU processing
>>>
>>>     Setup is as follows:
>>>
>>>     Mythbuntu Mythtv 0.25 Fe/Be
>>>     4GB ram
>>>     3TB separate disk for recordings (USB unfortunately, but that's
>>>     another story, bios won't see correct drive size if installed as
>>> SATA)
>>>     3 HD Homerun tuners (giving me 6 inputs)
>>>     Nvidia HDMI output for video and audio
>>>
>>>     I have looked and looked at the settings, and cannot for the life
>>>     of me find out where in the heck to change the recording
>>>     resolution/bitrate etc.
>>>
>>>
>>> You can't. You have a digital tuner (albeit joined to your backend via a
>>> network) and it records what the TV company sends.
>>>
>>>
>>>  I Suspected as much.  Well that's a bummer.   Any ideas on what to do
>> about the annoying audio issue?  It's not all the time, but when it
>> happens, it's so irritating, nobody wants to continue the program.  It like
>> blanks out (audio) every few seconds for a blip.
>> I'm really really hoping it's a reception issue, which i'll remedy soon
>> with dual antennas.
>>
>>
> Could be a number of things, most likely one of the following is breaking
> the stream:
>
> *reception errors (check all cabling, signal levels, there are hdhr
> utilities for measuring stuff like this)
>
> *network bandwidth if you have a dodgy connection between the HDHRs and
> your backend, but it would take a few simultaneous streams to max out a
> 100M network. (put HDHR on a separate network and separate video card,
> chack all networking hardware including cables)
>

I mean separate NETWORK card.


>
> *disk IO when recording multiple streams, perhaps coupled with disk IO
> required for the database writes associated with recording a number of
> streams. (make sure mysql is on a separate disk to your recordings storage
> groups, get mysql performance optimised (there is a mythtv wiki page) make
> sure all disks are OK, defrag, blah blah)
>
> I have probably missed some things.
>
>
>> Lee
>>
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>>
>
>
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