GetASFStream records without sound

[tomba108]

Hi,

let me hit you with this one:

when I record from certain mms stream, I sometimes do not get any sound in the recorded file. Video is OK, but there is no sound (when I look at file Properties/Detail, Audio section is completely empty).

It only happens on specific broadcast streams, not all. They broadcast different materials, some of them are also from video DVDs and I suspect that these remain without sound when I record them. But I cannot say in advance, what source they will broadcast from, so I end up missing some recordings...

Any idea why this happens and how to solve it? Am I missing some audio codec (which one?)?

Help!