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avis [error]: unsupported input format (DIB )

How to open/import MP4,MKV,WMV,RM,MOV,OGM with any editor,encoder like Virtualdub, Tmpgenc, Windows Media Encoder, etc using Avisynth. It may not work for all above formats, it depends what kind of audio and video codec that is used.
Be sure that you can play the video in Windows Media Player.
Install Windows Media Player 10 for WMV9.
Install haali media splitter for MP4, OGM, MKV.
Install xvid codec or divx codec for MP4,MKV with divx,xvid.
Install ffdshow for MP4,MKV with h264/x264.
Install Real Alternative for RM,RMVB,RAM video.
Install Quicktime Alternative for MOV video.
Install avisynth, http://prdownloads.sourceforge.net/avisynth2/Avisynth_256.exe?download
Start notepad.
Type
DirectShowSource("c:\locationto\video.mp4")
replace c:\locationto\video.mp4 with the location to your video file.
File>Save as
Select Save as type: All files
Save as video.avs

Open the video.avs with Windows Media Player and it should play.
You can now import the video.avs file in for example Virtualdub, Tmpgenc, Windows Media Encoder or most other editors. When you import the file in your tool select All files under Files of type to see the .avs file.

http://avisynth.org/DirectShowSource