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

Joseph A. Caputo jcaputo1 at comcast.net
Fri Aug 1 12:27:30 EDT 2003


> -----Original Message-----
> From: mythtv-users-bounces at snowman.net
> [mailto: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 another
sound card or another computer you can try playing your recordings on?

-JAC



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