I don’t cut videos too often, but sometime I still have to do some video cutting works like simply merging my recorded gaming videos.

As a developer, if there is something that can be done from commandline, I wouldn’t bother to find some other GUI app.

FFmpeg is obviously the powerful tool to fulfill my requirements.

CUT VIDEO

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ffmpeg -ss 00:00:30.0 -i input.wmv -c copy -t 00:00:10.0 output.wmv
ffmpeg -ss 30 -i input.wmv -c copy -t 10 output.wmv

See Seeking for more details.

MERGE VIDEOS

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# Create File List
echo file file1.mp4 >  mylist.txt 
echo file file2.mp4 >> mylist.txt
echo file file3.mp4 >> mylist.txt
# Concatenate Files
ffmpeg -f concat -i mylist.txt -c copy output.mp4

See Concatenate for more info.