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Convert mp4 to gif

Requirements⚑

  • youtube-dl (brew)
  • ffmpeg (brew)

Gif Magic⚑

  1. Get list of available formats: youtube-dl -F "https://www.youtube.com/watch?v=0N-nX_4C95o"
  2. Download: youtube-dl -f 134 "https://www.youtube.com/watch?v=0N-nX_4C95o"
  3. If needed convert to mp4: ffmpeg -i Huna.webm -strict experimental Huna.Timelapse.mp4
  4. Trim with iMovie
  5. Encode mp4 to gif: ./gifenc.sh chimpscropped.mp4 chimps.gif
$ cat gifenc.sh
#!/bin/sh
#
# USAGE: ./gifenc.sh input.mov output.gif 720 10 will output 720p wide 10fps GIF from the movie you gave it.
# https://cassidy.codes/blog/2017/04/25/ffmpeg-frames-to-gif-optimization/
#
# Vars
fps=10
scl=720
palette="/tmp/palette.png"
filters="fps=$fps,scale=$scl:-1:flags=lanczos"

##ffmpeg -v warning -i "$1" -vf "$filters,palettegen" -y "$palette"
##ffmpeg -v warning -i "$1" -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y "$2"

ffmpeg -v warning -i $1 -vf "$filters,palettegen=stats_mode=diff" -y $palette
ffmpeg -i $1 -i $palette -lavfi "$filters,paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle" -y $2

To take every 15th frame, use 

ffmpeg -i in.mp4 -vf select='not(mod(n,15))',setpts=N/FRAME_RATE/TB out.mp4

Another method is to use the framestep filter 

ffmpeg -i in.mp4 -vf framestep=15,setpts=N/FRAME_RATE/TB out.mp4

More ffmpeg commands⚑

Join audio files

The loop puts all the filenames in a file, one-per-line, then uses ffmpeg's concat demuxer to merge the files 

for f in *.flac; do echo "file '$f'" >> inputs.txt; done
ffmpeg -f concat -i inputs.txt

Convert to MP4 

ffmpeg -i $input_file.mkv -codec copy $output_file.mp4

Combine video and audio with an offset 

ffmpeg -i $input_file.mp4 -itsoffset 00:00:08 -i $input_file.mp3 output.mp4

Remove audio from a video 

ffmpeg -i $input_file -c copy -an $output_file

References⚑

https://www.expertstool.com/linkedin-video-downloader/ (for LI videos)