aclark at ghoti
Apr 20, 2006, 8:43 PM
Post #5 of 5
(990 views)
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On Apr 20, 2006, at 7:37 PM, Michael T. Dean wrote:
> On 04/20/2006 01:24 AM, Ashley Clark wrote:
>
>> On Apr 19, 2006, at 8:23 PM, Michael T. Dean wrote:
>>
>>> On 04/19/2006 04:31 PM, Ashley Clark wrote:
>>>
>>>> I'm using an optical audio connection to my receiver with AC3 pass-
>>>> through enabled.
>>>>
>>>> Occasionally, when starting a program and/or after fast-forwarding
>>>> there's a loud pop through my receiver. It seems as if it's some
>>>> corrupted buffered data being passed through and I'm wondering if
>>>> there's something I can do to prevent that.
>>>
>>> Perhaps your receiver switching from PCM to AC-3 mode?
>>
>> Yeah, I thought about that, was kind of hoping it was a software
>> issue though. Any way to find out?
>
> It's definitely possible. Myth doesn't really do much special to kick
> off the AC-3 stream (and what it does do may be more of a hack than a
> proper switch). See
> http://www.gossamer-threads.com/lists/mythtv/commits/194162#194162 and
> the thread at
> http://www.gossamer-threads.com/lists/mythtv/dev/194225#194225 for
> more. If you're running SVN, you might want to try out the patch from
> #1608 (
> http://svn.mythtv.org/trac/attachment/ticket/1608/ac3-pass-thru-
> patch?format=raw
> ) and report back with your observations. Feedback--both good and
> bad--will definitely help to get the AC-3 issues worked out (and
> worked
> out properly).
Ok, so I read through that thread and I'm a little confused.
I have both HD sources and Cable sources set up. I thought that
turning on the AC3 pass through option would only pass AC3 on to the
receiver if the recording contained the data. Otherwise, PCM data
would be played through the same device. The thread seems to indicate
that this isn't the case. Now, that much seems to be working in my
case, so did I misread the thread? Is what I have not supposed to
work currently?
> As far as testing goes, do you have any other digital audio sources
> that
> do both PCM and AC-3 output (i.e. STB's, standalone DVD players,
> etc.)?
> If so, you may want to test the results of switching on that
> device. If
> you can trigger a switch without clicks, it's most likely not the
> receiver, but Myth. If the device doesn't allow you to trigger a
> switch
> (or if the switch doesn't happen normally when using the device--i.e.
> when switching from one part of a DVD (like a menu with audio) to
> another (movie playback)), try just starting AC-3 playback when your
> receiver is still in PCM mode (but with Auto-Format Decode enabled).
I'll have to look into this and see what happens.
Ashley Clark
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