no sound in recorded movie

Hello,

my recorded movies from tv do not play sound.
While recording the sound seems to be stored, too.
Playing the movie with aviplay I get this messages:

<codec keeper> : PCM audio decoder created
<aviplay> : Will try audio renderers in this order: OSS,SDL,noaudio
<audio renderer> : src fmt=0x01 2ch 48000Hz 16b 192000B/s balign=4 cbsz=0
<audio renderer> : dst fmt=0x01 2ch 48000Hz 16b 192000B/s balign=4 cbsz=0
<OSS audio renderer> : frags=8  size=4096b  buffer=32768b (4096b)
<ffdivx> : using DR1

The PCM channel is noch muted. What else can it be?

Thanks,
Alex