cheatsheets/ffmpeg.md

title	layout
Ffmpeg	default

Common switches

-codecs    # list codecs
-c:v       # video codec (-vcodec) - 'copy' to copy stream
-c:a       # audio codec (-acodec)

-fs SIZE         # limit file size (bytes)

-b:v 1M          # video bitrate (1M = 1Mbit/s)
-b:a 1M          # audio bitrate

-aspect RATIO    # aspect ratio (4:3, 16:9, or 1.25)
-r RATE          # frame rate per sec
-s WIDTHxHEIGHT  # frame size
-vn              # no video

-aq QUALITY      # audio quality (codec-specific)
-ar 44100        # audio sample rate (hz)
-ac 1            # audio channels (1=mono, 2=stereo)
-an              # no audio
-vol N           # volume (256=normal)

Ringtone conversion using ffmpeg

ffmpeg -i foo.mp3 -ac 1 -ab 128000 -f mp4 -acodec libfaac -y target.m4r

To webm

ffmpeg -i input.mp4 -vcodec libvpx -acoder libvorbis output.webm