My ffmpeg favourite commands

ffmpeg-cmds.sh

#!/usr/bin/env bash

# Reduce size
ffmpeg -i <video.mp4> -vcodec h264 -acodec aac <video-output.mp4>

# Extract a audio fragment from another audio
ffmpeg -ss 00:00:30 -t 00:02:58 -i <input.mp3> -acodec copy <ouput.mp3>

# Extract audio from a video
ffmpeg -i <video.avi> -f mp3 <audio.mp3>

# Creating a single image video
ffmpeg -loop 1 -i <image.png> -i <sound.mp3> -shortest <video.mp4>

# Creating a single image video to publish in fb or twitter.
# If you want visualize your mp4 in OS X : -pix_fmt yuv420p
# Perform scale using x264 : -vcodec libx264 -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2"
ffmpeg -loop 1 -y -i <image.jpg> -i <video.mov> -f mp4 -vcodec libx264 -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -acodec aac -pix_fmt yuv420p -shortest <video.mp4>

# Play music from youtube using youtube-dl
wget -q -O - `youtube-dl -b -g $url`| ffmpeg -i - -f mp3 -vn -acodec libmp3lame -| mpg123 -

# .mov to mp4 
ffmpeg -i <video-in.mov> -qscale <0..30:quality> <video-out.mp4>

# .mov to .gif
ffmpeg -i <video-in.mov> -s 600x400 -pix_fmt rgb8 -r 10 -f gif - | gifsicle --optimize=3 --delay=6 > <video-in.gif> 

# .git to mp4
ffmpeg -i <video-in.gif> -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" <video-out.mp4>

# .gif to mp4 with audio .mp3
ffmpeg -ignore_loop 0 -i <video-in.gif> -i <audio-in.mp3> -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -t <video-in-time-secs> <video-out.mp4>

# .mp4 to .gif
ffmpeg -i <video.mp4> -filter_complex 'fps=10,scale=320:-1:flags=lanczos,split [o1] [o2];[o1] palettegen [p]; [o2] fifo [o3];[o3] [p] paletteuse' <video.gif>

# .mp4 rotate
ffmpeg -i <video.mp4> -c copy -metadata:s:v:0 rotate=(45,90,180,270) <video-output.mp4>

# resize video dimensions
ffmpeg -i <video-original.mp4> -vf scale=X:Y <video-output.mp4>

# resize video dimensions (keeping aspect ratio)
ffmpeg -i <video-original.mp4> -vf scale=X:-1 <video-output.mp4>
ffmpeg -i <video-original.mp4> -vf scale=-1:Y <video-output.mp4>

# Resize (keep quality)
ffmpeg -i <video-input>_1920x1080.mp4 -vcodec libx264 -vf scale=1280:720 -r 60000/1001 -preset slow -crf 18 <video-output>_1280x720.mp4
ffmpeg -i <video-input>_1920x1080.mp4 -vcodec libx264 -vf scale=896:432 -r 60000/1001 -preset slow -crf 18 <video-output>_896x432.mp4

# Cut
ffmpeg -i <video-input> -ss 00:00:00.0 -to HH:MM:SS.MCRSEG <video-output>

# Crop crop=SizeX:SizeY:StartX:StartY"
ffmpeg -i <video-input> -filter:v "crop=1280:1030:0:0" <video-output>

# Usando youtube-dl
# Listando formatos disponibles
youtube-dl -F https://www.youtube.com/watch?v=ID

# Descargar video en formato webm
youtube-dl -f 251 https://www.youtube.com/watch?v=ID

# Convertir webm to mp3
ffmpeg -i <file.webm> -vn -ab 128k -ar 44100 -y <file.mp3>

# Reducir tamaño video
ffmpeg -i <video.mp4> -vcodec libx264 -crf 28 -preset faster -tune <video-small.mp4>

# MP4 to Windows Media (wmv)
ffmpeg -i <file.mp4> -qscale 2 -vcodec msmpeg4 -acodec wmav2 <output.wmv>
ffmpeg -i <file.mp4> -q:a 2 -q:v 2 -vcodec msmpeg4 -acodec wmav2 <output.wmv>

# Documentation
# https://trac.ffmpeg.org/wiki