====== ffmpeg - Cheatsheet ======

===== Common switches =====

<code bash>
-codecs          # List codecs.
-c:v             # Video codec (-vcodec) - 'copy' to copy stream.
-c:a             # Audio codec (-acodec).

-fs SIZE         # Limit file size (bytes).
</code>

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===== Bitrate =====

<code bash>
-b:v 1M          # Video bitrate (1M = 1Mbit/s).
-b:a 1M          # Audio bitrate.
</code>

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===== Video =====

<code bash>
-aspect RATIO    # Aspect ratio (4:3, 16:9, or 1.25).
-r RATE          # Frame rate per sec.
-s WIDTHxHEIGHT  # Frame size.
-vn              # No video.
</code>

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===== Audio =====

<code bash>
-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).
</code>

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===== Examples =====

==== Ringtone conversion ====

<code bash>
ffmpeg -i input.mp3 -ac 1 -ab 128000 -f mp4 -acodec libfaac -y output.m4r
</code>

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==== To web ====

<code bash>
# no audio
ffmpeg -i input.mov -vcodec h264   -an output.mp4
ffmpeg -i input.mov -vcodec libvpx -an output.webm

ffmpeg -i input.mov -vcodec h264 -acodec aac output.mp4
ffmpeg -i input.mov -vcodec libvpx -acodec libvorbis output.webm
</code>

<code html>
<video width="320" height="240" controls>
  <source src="movie.mp4" type='video/mp4'></source>
  <source src="movie.webm" type='video/ogg'></source>
</video>
</code>

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