| Argument | Description |
|---|---|
| Information | |
| -codecs | Display codecs |
| -formats | Display formats |
| -f fmt | Force format "fmt" |
| -i filename | Set input file name |
| -y | Overwrite output file |
| -t secs | Force duration to specific length (hh:mm:ss[.xxx]) |
| -fs limit | Set file size limit |
| -ss secs | Seek to given time position (hh:mm:ss[.xxx]) |
| -target type | Specify target type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd" etc); all format options are set automatically |
| Video | |
| -b bitrate | Video bitrate in bps |
| -r fps | Set frame rate (default 25) |
| -s WxH | Set frame size (default same as source) |
| -vf scale=W:H | Rescale video (use <=1 to scale, e.g. "640:-1" means resize height to scale, -2 means same but maintain even /2 count) |
| -vf transpose=n | Rotate video (0 = 90° counterclockwise and vertical flip; 1 = 90° clockwise; 2 = 90° counterclockwise; 3 = 90° clockwise and vertical flip) |
| -aspect aspect | Set aspect ratio (4:3, 16:9 etc) |
| -vn | Disable video |
| -pass n | Multipass rendering (1 or 2) |
| -vcodec | Force video codec (e.g. "h264", "copy") |
| -crf nn | Constant Rate Factor (0=lossless, 23=default, 17-28=acceptable) |
| Audio | |
| -ar freq | Audio frequency (default 44100 Hz) |
| -ab bitrate | Audio bitrate in bps (default 64k) |
| -aq quality | Audio quality (codec-specific, VBR) |
| -ac channels | Audio channels (ac=2 to downmix 5.1 to stereo) |
| -an | Disable audio |
| -acodec | Force audio codec ("aac", "mp3", "copy") |
| -q:a n | VBR quality (mp3=9-0, def=4, rec=2) |
| Subtitles | |
| -scodec | Force subtitle codec ("copy" to copy stream) |
| -sn | Disable subtitles |
2011-06-24