Is there a way to edit videos using c# without using a media library eg. Microsoft Expression Encoder etc.
Just need to be able to cut out unwanted parts or insert other videos into a specified time of the original video.
Can I edit the raw video file by perhaps converting it into a binary file and then cutting/pasting the code?
Most video formats have a container and a codec--that might be a good place to start
http://www.pitivi.org/manual/codecscontainers.html
If one were interested in implementing a program modifying video sans libraries a good place to start might be looking at the existing open source video libraries(eg FFMPEG https://www.ffmpeg.org/download.html ) as a reference
No there is no way to edit a video without using anything that would be considered a "library". You either must write your "library" or use a existing 3rd party one.
The only thing that could possibly not be thought of as a "library" is a full external tool that does what you want and your code would just be a front end GUI for it. For example writing a GUI front end for FFmpeg.