ffmpeg

Reference

official

https://ffmpeg.org

blog

https://fireship.io/lessons/ffmpeg-useful-techniques/

node js

https://www.npmjs.com/package/fluent-ffmpeg

example

concatenate

ffmpeg -f concat -i vids.txt -c copy out.mp4

vids.txt:

1
2
3

file 'name1.mov'
file 'name2.mov'
file 'name3.mov'

Type convention

ffmpeg -i in.mp4 out.mov

ffmpeg -i in.mp4 out.gif

Scale

It very common to reduce size of output file. Change scale usually the common and efficient way to do so.

ffmpeg -i in.mov -vf scale=960:-1 out.gif

Reference from ffmpeg wiki