You can try Avidemux. It's free and there's even a portable version.
https://avidemux.sourceforge.net/
https://portableapps.com/apps/music_...demux-portable

To save video clips:
(Ex. cut the beginning and/or end off a video)

Open Avidemux
Click the Open Video button
Browse to your source video file and click Open

Drag or use the arrow keys to move the time marker to the START point
Use the double-arrow buttons to go to the nearest keyframe
Click the [A button to set the START point

Drag or use the arrow keys to move the time marker to the END point
Use the double-arrow buttons to go to the nearest keyframe
Click the B] button to set the END point

*Important! Make sure to use the nearest keyframe
or you'll get an "end point of the cut is not on a keyframe" error

Under Output Format, choose the file type that matches the source.
Ex. MP4 Muxer for .mp4 files

Click the Save button
Choose a destination folder
Enter a name for the video (Ex. myvideo)
Click Save
Click OK