Bash script to reverse a video from YouTube. Intended for longer videos.

reverse_video.sh

# install dependencies
pip3 install youtube-dl
sudo apt install ffmpeg

# make folders to store movie chunks
mkdir parts r_parts

# download movie (change URL to your video)
youtube-dl "https://www.youtube.com/watch?v=dQw4w9WgXcQ" -f mp4 -o movie_in.mp4

# split movie into 1 minute chunks
ffmpeg -i movie_in.mp4 -threads 3 -vcodec copy -f segment -segment_time 60 parts/%04d.mp4

# reverse each 1 minute chunk
for i in parts/*; do ffmpeg -i $i -vf reverse -af areverse "r_parts/${i##*/}"; done

# index reversed chunks IN REVERSE ORDER
for f in $(ls -1 r_parts/*.mp4 | sort -r); do echo "file $f" >> mylist.txt; done

# merge all chunks by reading from index file
ffmpeg -f concat -safe 0 -i mylist.txt -c copy movie_out.mp4