[mythtv-users] Re:btaudio works under sox but not MythTV

[NICHOLAS ALLEN HALL]

----- Original Message -----
From: "Joseph A. Caputo" <jcaputo1 at comcast.net>
Date: Friday, August 1, 2003 10:27 am
Subject: RE: RE: [mythtv-users] Re:btaudio works under sox but not MythTV

> > -----Original Message-----
> > From: mythtv-users-bounces at snowman.net
> > [mythtv-users-bounces at snowman.net]On Behalf Of NICHOLAS ALLEN
> > HALL
> > Sent: Thursday, July 31, 2003 5:00 PM
> > To: mythtv-users at snowman.net
> > Subject: Re: RE: [mythtv-users] Re:btaudio works under sox but not
> > MythTV
> >
> >
> > Thanks for replying. Yes, I changed the sampling rate to 32000
> > for both the Default and LiveTV recording profiles. Even though
> > it says on that screen that 32000 is recommended for btaudio, I
> > did also try changing them both to 48000 after I was unable to
> > get the sound to the normal pitch at 32000 but it did not help -
> > no matter what they are set to the high-pitch chipmunk sound
> > still remains.
> >
> > One note that may or not be significant is that when I'm watching
> > live tv, the video is the normal speed but since the sound seems
> > about 2 times faster, the sound pauses every couple seconds to
> > let the video catch up (I think this seems obvious). However, if
> > I record a program, the sound is still the same speed/pitch but
> > the audio is also speeded up and stays in sync with the video. I
> > used MythTV to do a 1 minute "manual recording" and then played
> > back the video it recorded and it took 38 seconds to play the
> > video so it turns out that the video plays at about 1.6x normal 
> speed.>
> > I was curious what would happen if I changed the mythfrontend
> > Record options for "Default" and "LiveTV" to 48000 kHz and the
> > video still recorded so it played in 38 seconds, with no apparent
> > difference. I've also tried changing the "setup" settings for the
> > capture card to have a sampling rate limit of "none" and also
> > tried "48000" (in addition to the 32000 it apparently should be)
> > and all of those settings always result in a recording of 38
> > seconds long, so it doesn't seem like any of those settings are
> > actually doing anything. I've checked the "capturecard" table in
> > the mythconverg to confirm that the setup program is definitely
> > putting the values in there.
> >
> > Does anyone have any suggestions of where to look next? Thanks
> > for any help,
> >
> > Nick
> 
> 
> The problem might be your (output) sound card.  You may very well be
> recording at 32000 Hz, but your sound card may not be able to 
> *play* 32000
> Hz, so everything gets played at 44100 or 48000 Hz.  Do you have 
> anothersound card or another computer you can try playing your 
> recordings on?
> 
> -JAC
> 

Hey, thanks a lot for all your help Joseph! I was thinking along the same lines last night when I tried out MythMusic and noticed that all the songs were playing a little fast and off pitch and figured that it was playing the 44.1 kHz at 48 kHz. I found an old Soundblaster Live laying around this morning and put it in and the audio was working just fine in only a few minutes. The sound I was using before was the onboard NForce2 chipset sound on my motherboard using the i810_audio module. Apparently sox must automatically resample the sound to bring it up to 48 kHz but Myth doesn't. I'm not sure if there's any way of getting Myth to resample in the same way or not. Anyway, its working now, so thanks a lot.

Nick