FFmpeg useful commands

ffmpeg.sh

# remove sound
ffmpeg -i input.mp4 -c copy -an output.mp4

# export first frame
ffmpeg -i input.mp4 -ss 0 -vframes 1 poster.png

# Resize
ffmpeg -i input.mp4 -filter:v scale=-1:720 -c:a copy output.mp4
ffmpeg -i input.mp4 -filter:v scale=-1:720 -c:a copy output.mp4

#Bitrate
ffmpeg -i input.mp4 -c:v libx264 -b:v 2M -maxrate 2M -bufsize 1M output.mp4
ffmpeg -i input.mp4 -c:v copy -ar 44100 -ab 128k output.mp4

# Merge audio and video
ffmpeg -i video.mp4 -i audio.m4a -c:v copy -c:a copy output.mp4

# Rotate
ffmpeg -i input.mp4 -vf "hflip,vflip" output.mp4