problem muxing (or playing) mp3 together with x264 in MKV

[grumpygamer]

Hello everyone, I am still experimenting so please bear with me.

I have encoded with x264 (sharktooth's AE-Standard quality profile) an old anime.
I also demuxed and MP3ed the audio track and then muxed them both together in a mkv container
via mkvmerge (i also tried avimuxgui with the same result)...

Now... the file plays ok in MPClassic, but in media player there is no video but only the stuttering audio!
Furthermore I notice that the FFDShow icon is present during playback with MPC but with WMP there is nothing there?

I don't think it's a wrong mux because i tried with 2 different muxers so i suppose there is some other problem which i am not aware of...
shouldn't both players invoke FFDShow to decode??
Maybe I'm wrong, I dunno...
please shed some light...
thanks
-GG

[cmw]

You probably have some other codecs interfering with ffdshow (like.. installed a codec pack or sth?). If that's the case, try to uninstall those additional codecs.

[Ranguvar]

Kinda funny, I thought WMP used the same DirectShow (except in some WMVs). But yeah. ffdshow is all you need for decoding :)