2014-02-25 10:32:14 +00:00
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---
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2017-09-20 08:08:11 +00:00
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title: ffmpeg
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2015-11-24 05:06:06 +00:00
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category: CLI
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2014-02-25 10:32:14 +00:00
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---
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### Common switches
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2017-09-20 08:08:11 +00:00
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```bash
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-codecs # list codecs
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-c:v # video codec (-vcodec) - 'copy' to copy stream
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-c:a # audio codec (-acodec)
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```
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2014-02-25 10:32:14 +00:00
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2017-09-20 08:08:11 +00:00
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```bash
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-fs SIZE # limit file size (bytes)
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```
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2014-02-25 10:32:14 +00:00
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2017-09-20 08:08:11 +00:00
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### Bitrate
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2014-02-25 10:32:14 +00:00
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2017-09-20 08:08:11 +00:00
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```bash
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-b:v 1M # video bitrate (1M = 1Mbit/s)
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-b:a 1M # audio bitrate
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```
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2014-02-25 10:32:14 +00:00
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2017-09-20 08:08:11 +00:00
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### Video
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2014-03-26 11:56:06 +00:00
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2017-09-20 08:08:11 +00:00
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```bash
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-aspect RATIO # aspect ratio (4:3, 16:9, or 1.25)
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-r RATE # frame rate per sec
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-s WIDTHxHEIGHT # frame size
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-vn # no video
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```
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### Audio
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```bash
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-aq QUALITY # audio quality (codec-specific)
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-ar 44100 # audio sample rate (hz)
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-ac 1 # audio channels (1=mono, 2=stereo)
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-an # no audio
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-vol N # volume (256=normal)
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```
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## Example
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2014-03-26 11:56:06 +00:00
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2014-02-25 10:32:14 +00:00
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### Ringtone conversion using ffmpeg
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2017-09-20 08:08:11 +00:00
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```bash
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ffmpeg -i foo.mp3 -ac 1 -ab 128000 -f mp4 -acodec libfaac -y target.m4r
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```
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2014-02-25 10:32:14 +00:00
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2014-03-26 11:56:06 +00:00
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### To web
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2014-02-25 10:32:14 +00:00
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2017-09-20 08:08:11 +00:00
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```bash
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# no audio
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ffmpeg -i input.mov -vcodec h264 -an -strict -2 output.mp4
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ffmpeg -i input.mov -vcodec libvpx -an output.webm
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```
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2014-04-28 10:57:58 +00:00
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2017-09-20 08:08:11 +00:00
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```bash
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ffmpeg -i input.mov -vcodec h264 -acodec aac -strict -2 output.mp4
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ffmpeg -i input.mov -vcodec libvpx -acodec libvorbis output.webm
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```
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2014-02-25 10:32:14 +00:00
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2017-09-20 08:08:11 +00:00
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```html
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<video width="320" height="240" controls>
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<source src="movie.mp4" type='video/mp4'></source>
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<source src="movie.webm" type='video/ogg'></source>
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</video>
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```
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