No tone when I select some channel (1 Viewer)

[Wadu]

TV-Server Version:
MediaPortal Version: 0.2.3.0 RC2
MediaPortal Skin: Blue Two
Windows Version: XP Prof Sp2
CPU Type: AMD X2 4200 AM2
HDD: Samsung S-ata 2x500 GB
Memory: Kingston DDR2 2x1024 667
Motherboard: ASUS M2NPV-VM, GeForce 6150/MCP 430
Motherboard Chipset: Nvidia 430
Motherboard Bios: Asus 0603
Video Card: Onboard NV GF 6150
Video Card Driver: ForceWare 82.05
Sound Card: Onboard
Sound Card AC3:
Sound Card Driver:
1. TV Card: Terratec Cinergy 1200 DVB-C (BDA 4.8.3.18)
1. TV Card Type: DVB-C
1. TV Card Driver: 4.8.3.17
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
Satelite/CableTV Provider:
HTPC Case: Antec Fusion
Cooling:
Power Supply:
Remote: MCE 2005
TV:
TV - HTPC Connection: S-Video


Hi!

When I start MyTV and I select a channel I heare no tone (some channels).
If I go into the audio stream selection screen I found there 2 streams (unknown and AC3).
At first I change to AC3. No tone. Now I change to the unknown stream the tone is ok.
But no timeshift is possible and I cannot record this channels.

I use the original terratec codecs (video/audio). When I use MPA Codec I have the same Problem.

See details in my logs.

I creat the log with following steps:

1. Start MP with MyTV
2. change to AC3
3. change to unknown
4. close MP

Thanks for help

ciao
wadu