Re: Distortion when switching from prologic to DolbyDigital

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Thanks Michael,

Where do I look next to solve the problem.

dmix
build the lastest alsa from source
submit a bug to the mythtv team

What is my next step?

Thanks,
Jon

On May 5, 2007, at 2:31 AM, Michael Bourgeous wrote:

> You're probably hearing Dolby Digital data being played as though it
> were raw PCM data.  This can happen if the wrong control bytes are set
> on the IEC958 interface, or if part of the AC3 stream that tells the
> decoder what kind of stream it is receiving is never sent.  I'm not
> sure what else can cause the problem; I have the same problem
> sometimes after seeking in xine, with an emu10k1.  Since it looks like
> you are using dmix as well, dmix might be interfering with the
> transition from PCM to AC3.
>
> On 5/4/07, Jon Boehm <boehm100@xxxxxxxxxxx> wrote:
>> Hi,
>>
>> Config:
>> Ubuntu Feisty Fawn (server) upgraded from Edgy
>> using SPDIF connection onboard GA-965P-S3 ALC883
>> asound.conf configured with this how to http://mythtv.org/wiki/
>> index.php/Configuring_Digital_Sound
>>    where Alsa:default = dmix-digital
>>
>> Using mythtv, when i switch from a prologic recording to a Dolby
>> Digital recording I get a 1/2 second of LOAD, speaker popping,
>> distortion then the audio track plays normally.  I sound kind'a like
>> "FFiSTT"
>>
>> I'm new to this but I'm guessing this might be bad data while the
>> buffer fills the first time??  It does not happen with two back to
>> back DD tracks.
>>
>> Another data point, under Edgy, I saw similar behavior when I
>> directly used ALSA:SPDIF.  The problem went away when I used the
>> above asound.conf.  Not so lucky under Feisty.  :-(
>>
>> Thanks for the help,
>> Jon
>>
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