Clever FFmpeg GUI is a small, but smart GUI for FFmpeg.

It's for Windows Systems, x86 and x64, portable.
It processes Audio and Video streams separately. These can be muxed after processing.
Automatic stream detection, Video, Audio and Subtitle stream extraction, Video, Audio and Subtitle stream conversion, Audio volume detection,
Audio lenght and pitch modification, automatic Video crop detection, Audio and Video Fade In and Fade Out, Multiplex, Cut,
Change aspect ratio without recoding, Change Audio and Subtitles stream language, Change profile level without recoding (for x264 and hevc).

Implemented DVD movie rip (unprotected DVD's only): 
Locate the VIDEO_TS folder of the DVD and look at the Video Titleset VOB files (g.e. VTS_01_1.VOB is the first part of the Video Title 1).
Point to the desired Video Title Set, first part (VTS_01_1.VOB for Video Title 1) and the entire Title (Movie) 01 will be ripped and imported, 
if you answer YES to the question if you want to rip the whole movie. If you answer NO, only the selected part is read and imported.

Video Stream Encoding to: mpeg2, x264 (avc), x265 (hevc), Divx, Xvid, VP8, VP9, DnxHR.
Audio Stream Encoding to: aac, ac3, eac3, dts, flac, mp2, mp3, opus, vorbis, pcm (wav), trueHD.
Audio Stream Channels: mono, stereo, 5.1, 7.1, 5.1 to 2, 5.1 to single pcm, 7.1 to single pcm.
Multiplex to: asf, avi, m2ts, mkv, mov, mpg, mp4, mxf, ts, vob, webm.

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 and a folder for the target files.
That's it.

Requires .NET 4.6.
Requires Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

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Added Avisynth support with version 2.7.2. 
You need an working Avisynth+ (recommed) installation with the necessary plugins.
https://avs-plus.net/

To test the Avisynth script you need also VirtualDub2 (recommed).
https://sourceforge.net/projects/vdfiltermod/files/
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Enjoy
ProWo

FFmpeg static builds for Windows:
https://www.videohelp.com/software/ffmpeg

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). 