[mythtv-users] Audio wierdness: AC-3 upconvert. Do I have a problem?

Phil Wild phil at holobyte.com.au
Wed Jun 12 13:51:02 UTC 2013


On 12 June 2013 21:36, Phil Wild <phil at holobyte.com.au> wrote:

>
>
>> that's what it is... it's the same graphic controller as a nvidia
>> 9400M... audio channels are incorrectly ordered on that card.
>>
>> Here is a post that can help:
>>
>> http://www.mentby.com/Group/mythtv-users/51-wrong-speaker-problem-solved.html
>>
>> (background info)
>> http://www.mentby.com/Group/mythtv-users/51-wrong-speaker-problem.html
>>
>> >
>> > The reason I started fiddling is that recently, I seem to get a lot of
>> > crackling through the rear speakers (most prominently left-rear), only
>> > through mythtv. I first thought it was the speaker or amp, but
>> everything
>> > sounds perfect with other sources. I then put it down to a bad rip but
>> it is
>> > evident in lots of files. I did not notice any of this prior to my
>> upgrade
>> > to 0.26. So I thought I would play with the audio settings and then
>> noticed
>> > this issue.
>>
>> what were your settings previously?
>>
>>
> I hadn't changed settings previously, just upgraded from 0.25 to 0.26 and
> then a couple of days after that noticed the clipping/crackling coming from
> the rear surround speakers. I notice it on the left rear the most.
> Previous setting did not upconvert to 5.1, had just enabled DD, DTS, and
> all the other checkboxes. In the track I have been testing, the sound is
> just two channel. Device is configured as alsa:hw. I am off topic for the
> original thread now...
>
> I did some more testing tonight. bluray track via bluray player, very loud
> and no issues. The track I was playing through mythtv that sounds terrible,
> I played through my Roku3 and Plex and it sounds perfect.
> I am going to switch the hdmi inputs on the back of the receiver to
> confirm that it is not the receiver input. I'm also going to load VLC onto
> my frontend and play the file through it to see if it is OS related rather
> than mythtv.
>
>
>
Just confirmed this is not a mythtv issue. I get the same poor sound
quality through vlc so it is not related to my upgrade from 0.25 to 0.26.
At the same time, I upgrade the OS (apt-get update;apt-get upgrade) so
perhaps it was introduced there...
It still could be the input on the receiver. Pulling the receiver out to
switch the inputs is a pain.

Cheers

Phil
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