Looking at AvisynthShader page:
Assuming you installed Avisynth and placed the AvisynthShader and the FFmpegSource plugin inside the plugins folder:
Code:
ConvertToShader(1)
FFMpegSource2("yourvideo.mkv")
Shader("bloom.hlsl", Output=2)
Shader("sharpen.hlsl", Output=3)
Shader("anglecorrect.hlsl", Clip1=2, Clip2=3, Output=1)
ShaderExecute(last, Input, Clip1Precision=1, Precision=3, OutputPrecision=1)
ConvertFromShader(1)
should apply the shaders,.. (you still need to use the avisynth script with a tool that supports Avisynth like ffmpeg/mencoder/mplayer/VirtualDub/... to process the script and create the video output,..)
-> you might want to get accustomed with Avisynth in general and start with the link TheFluff posted to understand the whole thing,..