Aiseesoft Video Converter Ultimate - the program will allow you to easily convert a wide range of video files into the formats you need. Externally, the application does not differ from others from these developers, you can add a video by simply dragging it with the mouse into the main window, then you need to select the desired format, configure the video and audio parameters, then edit the video if necessary, then click the “Convert” button - wait for the result to finish, everything is as simple as shelling pears.

Peculiarities:
Download videos from YouTube and other sites
Converter with hundreds of profiles
Advanced Editor
Allows you to adjust color, brightness, contrast and other parameters
Convert 2D video to 3D
Intuitive interface
You can add material by moving it to the main window
Fast work algorithm
Runs even on weak PCs
To activate it is enough to apply a replacement dll and you will be happy 
There is an unofficial portable version, does not require installation, unpack it and use it
Low PC resource consumption