I've been running into an audio problem that I can't seem to track down.

Since I'm fairly new at Knoppmyth, I'm not sure all of the information I can provide.

Knpoomyth RA26
P4-2.8 (northwood)
ASUS P4P800
PVR-500MCE (NTSC)
SBLive Xgamer
MX4000 PCI (svideo out)

With the exception of channel 5 which is a little snowy (but shows up fine when the cable TV is connected directly to the set), Everything is working really well.

When I tune to channel 2, the audio is a bit choppy most of the time (live/recorded). I've enabled the "extra audio buffering" option and made tried syncing to the video for timing, but it doesn't seem to have any impact. I started out using the onboard sound on the P4P800, and though that might be a contributing factor. Installed the SBLive to see if it would help.

The audio is clipped at some times, but it almost sounds like I'm have a twitchy time stretch on the audio. It keeps in sync with the video signal though. This only happens on channel 2 (Comcast cable).

I know I'll probably have to add more info, just let me know what information I can provide.

thanks,

I had this on the PBS station, and so did the fellow who did this writeup:

http://digitalmedia.oreilly.com/2005/06/22/myth_tv.html
Taking his cue, I switched to "Transport Stream" recording, and that fixed it. See:
http://www.oreillynet.com/cs/user/view/cs_msg/73714
May or may not be applicable to your situation, of course. But it cleared it up for me.

My symptom was that it sounded like someone was talking into a fan. Everything sounded like helicopters.

The other audio probem that I had, where it would get wavery when the scenes were dark (yep, others had it too!) was cured with the extra audio buffering.

Ok, I managed to get VNC and SSH set up so I could check from a remote location (with at least a modest amount of security). I'm in the capture card settings page and I'm not seeing anything remotely resembling an "Advanced" options page. (from the linked URL--mythtv-setup capture cards, advanced, recording options PS/TS).

Is there a conf file that I might be able to adjust this in?

thanks,

It's there on my system, but maybe because I (and the author of that writeup) are using PC3000 cards in DVB mode?

I struggled with a similar situation several months back where a handful of channels had no audio or choppy audio. I fixed it by fine tuning the stations through the mythweb interface. A search for "fine tune" or "fine tuning" should find the thread, but suffice to say I had to add a 125 offset to those channels with audio problems. I'm not sure if this is relevant to your problem or not. I should mention that I have not had any of these issues since R5A16. BTW - I have a PVR-150 and use analog Comcast cable (Chicagoland area).

Just to give some feedback and info for anyone running into the same problem.

referring from http://mysettopbox.tv/phpBB2/viewtopic.php?p=44701&
tjc wrote:


I found an offset of 10 a little to high--8 seemed a bit better.

thanks,