# Debian/Ubuntu
apt-get install ffmpeg

# CentOS/RHEL
yum install ffmpeg

brew install ffmpeg

ffmpeg [global_options] {[input_file_options] -i input_url} ... {[output_file_options] output_url}

ffmpeg -i input.mp4

# MP4 to AVI
ffmpeg -i input.mp4 output.avi

# GIF to MP4
ffmpeg -i animated.gif -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" video.mp4

# WEBM to MP4
ffmpeg -i movie.webm movie.mp4

# Extract all frames
ffmpeg -i video.mpg image-%04d.jpg

# Take single snapshot
ffmpeg -i input.mp4 -y -f image2 -ss 00:00:08.010 -t 0.001 -s 352x240 snapshot.jpg

# From PNGs
ffmpeg -framerate 30 -pattern_type glob -i '*.png' -c:v libx264 -pix_fmt yuv420p out.mp4

# From JPGs with padding
ffmpeg -framerate 10 -pattern_type glob -i '*.jpg' \
    -c:v libx264 -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -pix_fmt yuv420p output.mp4

# WAV to MP3
ffmpeg -i input.wav -vn -ar 44100 -ac 2 -b:a 192k output.mp3

# Add background music
ffmpeg -i audio.mp3 -i input.mp4 -filter_complex "[0:a][1:a]amerge,pan=stereo|c0<c0+c2|c1<c1+c3[out]" \
    -map 1:v -map "[out]" -c:v copy -shortest output.mp4