Clever FFmpeg GUI is a small, but smart GUI for FFmpeg. CopyRight by ProWo.

It processes Audio and Video streams separately.These can be muxed after processing. 

It is for Windows, portable, for x86 and x64. 

Automatic stream detection, Video and Audio stream conversion, Audio volume detection, Audio lenght and pitch modification, Video automatic crop detection, Change aspect ratio, Change Audio and Subtitles stream language.

Implemented DVD movie rip (unprotected DVD's only). Point to the desired VTS and the entire movie will be ripped and imported.

Requires .NET 4.6.

Static builds of ffmpeg, ffprobe, ffplay are needed. (Download link below).
They have to be into the same folder.
 
At the first start you have to specify there location path. 
That's it.

Enjoy
ProWo

FFmpeg static builds for Windows:
https://ffmpeg.zeranoe.com/builds/ 

NB.
In case of startup errors or problems, delete this folder (it will be created again automatically):
C:\Users\xxx\AppData\Local\clever_FFmpeg_GUI (where xxx=your user name on windows). 