A few scripts to speedup, concatenate and possibly other operations using ffmpeg on linux (also works on Chromebooks) from the command line:
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| ffmpeg -safe 0 -f concat -i <(find . -type f -name '*.mp4' -printf "file '$PWD/%p'\n" | sort) -c copy output.mp4 |
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| ffmpeg -i $1 -filter_complex "[0:v]setpts=0.87*PTS[v];[0:a]atempo=1.15[a]" -map "[v]" -map "[a]" speedup_$1 |
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| # ffmpeg_trim.sh input.mp4 00:14 03:24 | |
| ffmpeg -i $1 -ss 00:${2} -to 00:${3} -c:v copy -c:a copy ${1}_trim.mp4 |
I used those to pre-record videos for a conference (after recording with Loom)