[mythtv-users] Problems switching from passthru <--> pcm stream

[Sander Knopper]

Hi all,

Let me say that I've had a lot of problems when it comes to sound on the 
system involved. Most of the problems simply resolved themselves while 
updating the kernel and/or mythtv, but this one keeps sticking around.

I have an Asus P7H55M-PRO motherboard with Realtek ALC892 chipset, which is 
connected with an optical cable to my tuner, which is from Philips.

The following scenario occurs a lot at our home.

1) People are listening to music and the decide to watch a movie.
2) People are watching a movie and when it's finished they decide to listen to 
some music.

Both scenarios are quite typical for an HTPC I might say.

The thing is, when switching from movie to music or vice versa, most of the 
time a short "cracking sound" can be heard. This happens mostly when going 
from pcm stream audio (music) to bitstream audio (movie).

The cracking sound is annoying, but what's even worse is that after that 
there's usually no sound at all anymore. Turning the tuner off and on always 
helps.

So today I've opened a terminal to check output from iecset during these 
transitions. All I can say is that mythtv is doing a good job, data is going 
from "audio" to "non-audio" and back as one would expect.

Can someone tell me if this problem is very likely to be solved with a new 
amplifier or is it still likely to be a problem with myth or alsa?

Any new insights are highly appreciated! Of course I'd be more than happy to 
supply logs or other info if needed.


Regards,

Sander Knopper