   can write app to install codecs using DirectX  (directShow) ?
  Hi all,Can i ask you for helping????I would like to write an application that allow install automatically codecs for video (and audio) to system, so that i can open compressed video after that by any multimedia software( example: Window Media Player,...).I wonder that can i use directX (directShow???) to do that?If directX (directShow???)can. And if you know any sample can do that, can you share it with me now???I am very happy and thank for any help from you.   
  I am a little confused by your question, but here goes.  Yes, you can create DirectShow filters so that any application that uses DirectShow can decode your custom formats.  You just create the DLL that contains the filter, and register it with the system.  DirectShow loads all these when it's initialized (or called, or how ever it might work internally), when it needs to decode data.  Anything that uses DirectShow for decoding data like this will now be able to access your custom filter data type.   ;  Thank xycsoscyx,And can you help me more?If you sure that i can perform install codec for video and audio when run my app  to system (and i can open compressed video after that????):  Can you show me where i can find sample (source code) do as you said.  Or can you show me some link(s) that i can research and write my app as your advice?