FFMPEG scripts to speedup and concatenate videos, useful for prerecording videos for conferences

concat_mp4.sh

ffmpeg -safe 0 -f concat -i <(find . -type f -name '*.mp4' -printf "file '$PWD/%p'\n" | sort) -c copy output.mp4

ffmpeg_speedup.sh

ffmpeg -i $1 -filter_complex "[0:v]setpts=0.87*PTS[v];[0:a]atempo=1.15[a]" -map "[v]" -map "[a]" speedup_$1

ffmpeg_trim.sh

# 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

on macos find does not have printf, so list should be build with something like:

find . -type f -name '*.mp4' -print0 | xargs -I {} -0 stat -f "file '$PWD/{}'" | sort

So on macOS it can be like this:

ffmpeg -safe 0 -f concat -i <(find . -type f -name '*.mp4' -print0 | xargs -I {} -0 stat -f "file '$PWD/{}'" | sort) -c copy output.mp4

Or just install another find

brew install findutils

and then create alias:

alias find=gfind

Prepare files:(rename them by creation date):

for f in *.MP4; do D=$(date -r $(stat -f %B "$f") +%Y-%m-%d-%H-%M-%S); cp "$f" "$D-$f"; done

with simple encoding:

ffmpeg -safe 0 -f concat -i <(find . -type f -name '*.MP4' -print0 | xargs -I {} -0 stat -f "file '$PWD/{}'" | sort) -c:a copy -c:v h264  _output.mp4