Fastest way to cut and remove parts of a video

It is possible that your software is re-encoding the file. If you just want to copy a 5 second chunk of the movie, you can use this command:

ffmpeg -i YourFile.mp4 -ss 00:10:25 -t 00:00:05 -acodec copy -vcodec copy Output.mp4

• Where -i is the name of your file.
• -ss is the start position in Hours:Minutes:Seconds
• -t is how long a clip you want - again in HH:MM:SS
• The acodec and vcodec tells ffmpeg just to copy the file without changing it at all.

That's about the fastest you can get it.