Issues with Directshow playing WMV

Hi.

I am using the VMR9 to render video files. For rendering WMV, I am specifically adding the asf reader filter to the filter graph.

many times, when playing wmv files, the audio sounds very noisy. Speech sounds like someone speaking from inside a can. Music sounds bad too.

When I play the same wmv file using windows media player, it sounds ok. So looks like the issue probably is with the asf reader filter.

anybody any ideas what the issue could be and / or how to fix it? I am not posting any code because in this instance, I am doing just the standard stuff, nothing fancy.

Thanks.
-Vinayak