This Program just calls FFmpeg command line tool like below:
$ ffmpeg -ss 00:00:00 -t 00:10:00 -i input.mp4 -c:v copy -c:a copy -async 1 output.mp4
cutting a video/audio file without loss and encoding time.

Install .NET Runtime version 9 https://dotnet.microsoft.com/en-us/download/dotnet/9.0

1. Drag&Drop a video/audio file on [ここに動画ファイルを...] or just Press It
2. Set Start and End Time
3. Press [カット (Ctrl + X)] Button

You can move your cursor with the Tab key between StartTime Form, EndTime Form, and Cut Button.
Ctrl + X shortcut key acts as Cut Button.

1. Download FFmpeg from https://ffmpeg.org/ and Install it
2. Set Windows "PATH" Environment Variable for ffmpeg.exe or to Click [FFmpegを指定する] to Set the FFmpeg Path Locally

Install .NET SDK version 9 https://dotnet.microsoft.com/en-us/download/dotnet/9.0

$ dotnet publish