How can I merge two mp4 files without losing quality?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Game 3

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Chapters
00:00 Question
00:38 Accepted answer (Score 49)
01:43 Answer 2 (Score 30)
02:35 Answer 3 (Score 18)
03:42 Answer 4 (Score 8)
04:07 Thank you

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Full question
https://superuser.com/questions/43588/ho...

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Tags
#video #mp4 #merge

#avk47