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cmd+shift+5 is incredible for screen recording!

Splitting a screen recording without resampling the video is easy with quicktime - Edit/Trim the first part and save, then reopen the original recording, Edit/Trim the second part and save. These save super-fast, a testament to simply being copied rather than resampled.

But what if I'd like to merge (concatenate) two screen recordings without resampling?
Using quicktime's Edit/Add Clip to End seems to force a resampling and takes 10x longer to save. Is there a way around it?

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There is a command line tool called ffmpeg, which can be installed with any package manager such as brew or macports.

You can use concat option of ffmpeg like this:

ffmpeg -safe 0 -f concat -i listofvideos.txt -c copy output.mov

Contents of listofvideos.txt:

file 'movie1.mov'
file 'movie2.mov'
file 'movie3.mov'

-c copy makes sure the codec is copied and nothing is resampled. More info about concat can be found here

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    Thank you. What are the parameters "-safe" and -f "for?
    – BabyBoy
    Commented Feb 26, 2021 at 15:02
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    -safe 0 is to be able to use absolute paths or filenames with spaces in them in listofvideos.txt, -f concat is for forcing the concat demuxer.
    – Furkan Mudanyalı
    Commented Feb 26, 2021 at 15:58
  • unfortunately I have a work Macbook so I'm unable to run executables downloaded from the web and can't run package managers, however I can install apps, so I'm still looking for a solution for this
    – Jonathan
    Commented Mar 2, 2021 at 8:02
  • @Jonathan what about HandBrake? I suppose you can also do it under that.
    – Furkan Mudanyalı
    Commented Mar 2, 2021 at 8:05

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