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- Syntax: x264 [options] -o outfile infile
- Infile can be raw (in which case resolution is required),
- or YUV4MPEG (*.y4m),
- or Avisynth if compiled with support (no).
- or libav* formats if compiled with lavf support (no) or ffms support (no).
- Outfile type is selected by filename:
- .264 -> Raw bytestream
- .mkv -> Matroska
- .flv -> Flash Video
- .mp4 -> MP4 if compiled with GPAC support (no)
- Output bit depth: 8 (configured at compile time)
- Options:
- -h, --help List basic options
- --longhelp List more options
- --fullhelp List all options
- Example usage:
- Constant quality mode:
- x264 --crf 24 -o <output> <input>
- Two-pass with a bitrate of 1000kbps:
- x264 --pass 1 --bitrate 1000 -o <output> <input>
- x264 --pass 2 --bitrate 1000 -o <output> <input>
- Lossless:
- x264 --qp 0 -o <output> <input>
- Maximum PSNR at the cost of speed and visual quality:
- x264 --preset placebo --tune psnr -o <output> <input>
- Constant bitrate at 1000kbps with a 2 second-buffer:
- x264 --vbv-bufsize 2000 --bitrate 1000 -o <output> <input>
- Presets:
- --profile <string> Force the limits of an H.264 profile
- Overrides all settings.
- - baseline,main,high,high10,high422,high444
- --preset <string> Use a preset to select encoding settings [medium]
- Overridden by user settings.
- - ultrafast,superfast,veryfast,faster,fast
- - medium,slow,slower,veryslow,placebo
- --tune <string> Tune the settings for a particular type of source
- or situation
- Overridden by user settings.
- Multiple tunings are separated by commas.
- Only one psy tuning can be used at a time.
- - psy tunings: film,animation,grain,
- stillimage,psnr,ssim
- - other tunings: fastdecode,zerolatency
- Frame-type options:
- -I, --keyint <integer or "infinite"> Maximum GOP size [250]
- --tff Enable interlaced mode (top field first)
- --bff Enable interlaced mode (bottom field first)
- --pulldown <string> Use soft pulldown to change frame rate
- - none, 22, 32, 64, double, triple, euro (requires cfr input)
- Ratecontrol:
- -B, --bitrate <integer> Set bitrate (kbit/s)
- --crf <float> Quality-based VBR (0-51) [23.0]
- --vbv-maxrate <integer> Max local bitrate (kbit/s) [0]
- --vbv-bufsize <integer> Set size of the VBV buffer (kbit) [0]
- -p, --pass <integer> Enable multipass ratecontrol
- - 1: First pass, creates stats file
- - 2: Last pass, does not overwrite stats file
- Input/Output:
- -o, --output <string> Specify output file
- --sar width:height Specify Sample Aspect Ratio
- --fps <float|rational> Specify framerate
- --seek <integer> First frame to encode
- --frames <integer> Maximum number of frames to encode
- --level <string> Specify level (as defined by Annex A)
- --quiet Quiet Mode
- Filtering:
- --vf, --video-filter <filter0>/<filter1>/... Apply video filtering to the input file
- Filter options may be specified in <filter>:<option>=<value> format.
- Available filters:
- crop:left,top,right,bottom
- select_every:step,offset1[,...]
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