c# - How to cut/crop/trim a video in respect with time or percentage and save output in different file -

is there tutorial or c# library which me accomplish following

1. chose file edit
2. ask user select cut/crop/trim method :- time or percentage
3. cut/crop/trim video time or percentage chosen ( wish reduce 5 minute video 4 minute video, or reduce video 80%)
4. save video requested in required path

now steps 1) , 4) have implemented not find c# library accomplish 3) , 4)

i looked ffmpeg library not find c# wrapper accomplish requirements

any be appreciated

thank you

ffmpeg powerful application , have used many times, c#. don't need c# wrapper library. have execute ffmpeg commands c# using:

system.diagnostics.process.start(string filename, string arguments);

or use system.diagnostics.processstartinfo redirect standard output if need to.

this article explains how use system.diagnostics execute synchronous , asynchronous commands, etc.
http://www.codeproject.com/kb/cs/execute_command_in_csharp.aspx

here's simple example of how cut video file down first 4 minutes using ffmpeg c#.

using system.diagnostics process.start("ffmpeg.exe",               "-sameq -t 240 -i inputvideofile.avi outputvideofile.avi"); 

here's example of how use system.diagnostics.processstartinfo
c# , ffmpeg preferably without shell commands?

there lots of online resources explain of ffmpeg's features , how use them, search.