[mythtv-users] "Woodchuck" sound on TV playback
Michael T. Dean
mtdean at thirdcontact.com
Tue Aug 12 18:43:05 UTC 2008
On 08/12/2008 11:42 AM, James Oltman wrote:
> On Sun, Aug 10, 2008 at 7:00 PM, James Oltman wrote:
>> I've been trying to watch recordings from my HDHR device, and during
>> playback/watching TV I get this woodchuck noise through the speakers. These
>> are the logs on the frontend:
>> 2008-08-10 18:51:51.710 AFD: Opened codec 0x8657340, id(AC3) type(Audio)
>> 2008-08-10 18:51:51.718 Opening audio device 'default'. ch 6(2) sr 48000
>> 2008-08-10 18:51:51.719 Opening ALSA audio device 'default'.
>> 2008-08-10 18:51:53.260 Opening audio device 'default'. ch 2(2) sr 48000
>> 2008-08-10 18:51:53.260 Opening ALSA audio device 'default'.
>> 2008-08-10 18:51:54.089 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video
>> 2008-08-10 18:51:54.427 OSD Theme Dimensions W: 640 H: 480
>> 2008-08-10 18:51:55.010 TV: Changing from None to WatchingPreRecorded
>> 2008-08-10 18:51:55.016 The realtime priority setting is not enabled.
>> 2008-08-10 18:51:55.116 Video timing method: USleep with busy wait
>> 2008-08-10 18:51:56.010 NVP: prebuffering pause
>> I am outputting all audio out through my Creative Soundblaster Audigy
>> card's digital output. It's working for ISO movies with Dolby Digital
>> Surround sound and Xvid and MP3s etc. I'm running MythBuntu 8.04 on both
>> backend and frontend boxes. I'm using ALSA:default for my sound output in
>> Myth. Any ideas would be appreciated. I'd love to watch the Opening
>> Ceremonies in HD. Thanks!
> Should I be directing this question elsewhere? I tried the ALSA IRC
> channel, and they directed me here. Any help would be appreciated. Thanks!
You mean chipmunk sound? Like people talking with higher-pitched voices?
If so, and if you're using AC-3/DTS passthrough with Myth, the channel
you're watching probably has 32kHz AC-3 which most (meaning nearly all)
computer sound cards can't handle--they always slurp in AC-3 at 48kHz.
If you're not using passthrough, you simply need to configure the plug
sample/rate/format conversion plugin for ALSA. You can do so as
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