Maybe you have missed to install the appropriate codec. Consider reinstallation of codecs.

In order to use the DirectShow video engine, various codecs (ActiveX filters) have to be installed on your PC. Every file/format requires an ActiveX Splitter to split the streams into: Video, Audio, Subtitles etc. Then each stream requires its appropriate DirectShow ActiveX decoder. When you consider decoding various containers with DirectShow like: AVI, MKV, MOV, MP4, 3GP, FLV etc.. a large number of ActiveX filters are required to be installed on your PC. Problems often occur on PCs loaded with "codec packs" that are marketed as the best solution to decode everything! Codecs conflict is the main reason of failure when playing or decoding most multimedia formats.

To get the most reliable DirectShow configuration, three software packages should be installed on your PC after you have deinstalled any "codec packs":

• Latest Windows Media Player
• Haali Matroska Splitter
• ffdshow - ffdshow settings file
  

Either you download the settings file and add it to the registry to configure ffdshow or you do it manually:

Please go  to  “Start/All Programs/FFDShow/Video Decoder Coniguration”.  Please  set  “Error  Recognition”  and  “Error Concealment”  to  “none”.  This Configuration  ensures that  e.g.  Interlace-Format  files  do  no  receive  de-interlacing by  the decoder  (which would  remove  the stereo effect)