Common commands for converting images, photos and videos for web.

ffmpeg-and-webp.sh

 # Converts video (2 pass) with 15 fps @ 500kbs without audio (ideal for web) - http://trac.ffmpeg.org/wiki/Encode/VP9
 # Run both lines
ffmpeg -i input.mp4 -framerate 15 -c:v libvpx-vp9 -b:v 500k -pass 1 -an -f webm /dev/null && \
ffmpeg -i input.mp4 -framerate 15 -c:v libvpx-vp9 -b:v 500k -pass 2 -an output.webm

# Converts audio to OGG (96 kb/s) https://superuser.com/questions/1121334/how-to-use-ffmpeg-to-encode-ogg-audio-files
ffmpeg -i input.aif -c:a libvorbis -b:a 96k output.ogg

#Converts audio to MP3 (96 kb/s) https://trac.ffmpeg.org/wiki/Encode/MP3
ffmpeg -i input.aif -c:a libmp3lame -b:a 96k output.mp3

#Converting images to WEBP with quality set to 80
cwebp -q 80 image.png -o image.webp