Code:
x264 core:59 r816M 761630d
Syntax: x264 [options] -o outfile infile [widthxheight]
Infile can be raw YUV 4:2:0 (in which case resolution is required),
or YUV4MPEG 4:2:0 (*.y4m),
or AVI or Avisynth if compiled with AVIS support (yes).
Outfile type is selected by filename:
.264 -> Raw bytestream
.mkv -> Matroska
.mp4 -> MP4 if compiled with GPAC support (yes)
Options:
-h, --help List the more commonly used options
--longhelp List all options
Frame-type options:
-I, --keyint <integer> Maximum GOP size [250]
-i, --min-keyint <integer> Minimum GOP size [25]
--scenecut <integer> How aggressively to insert extra I-frames [40]
--pre-scenecut Faster, less precise scenecut detection.
Required and implied by multi-threading.
-b, --bframes <integer> Number of B-frames between I and P [0]
--no-b-adapt Disable adaptive B-frame decision
--b-bias <integer> Influences how often B-frames are used [0]
--b-pyramid Keep some B-frames as references
--no-cabac Disable CABAC
-r, --ref <integer> Number of reference frames [1]
--no-deblock Disable loop filter
-f, --deblock <alpha:beta> Loop filter AlphaC0 and Beta parameters [0:0]
--interlaced Enable pure-interlaced mode (tff)
--tff Alias for --interlaced
--bff Enable pure-interlaced mode (bff)
Ratecontrol:
-q, --qp <integer> Set QP (0=lossless) [26]
-B, --bitrate <integer> Set bitrate (kbit/s)
--crf <float> Quality-based VBR (nominal QP)
--vbv-maxrate <integer> Max local bitrate (kbit/s) [0]
--vbv-bufsize <integer> Enable CBR and set size of the VBV buffer (kbit) [0]
--vbv-init <float> Initial VBV buffer occupancy [0.9]
--qpmin <integer> Set min QP [10]
--qpmax <integer> Set max QP [51]
--qpstep <integer> Set max QP step [4]
--ratetol <float> Allowed variance of average bitrate [1.0]
--ipratio <float> QP factor between I and P [1.40]
--pbratio <float> QP factor between P and B [1.30]
--chroma-qp-offset <integer> QP difference between chroma and luma [0]
--aq-mode <integer> How AQ distributes bits [2]
- 0: Disabled
- 1: Avoid moving bits between frames
- 2: Move bits between frames
--aq-strength <float> Reduces blocking and blurring in flat and
textured areas. [1.0]
- 0.5: weak AQ
- 1.5: strong AQ
-p, --pass <1|2|3> Enable multipass ratecontrol
- 1: First pass, creates stats file
- 2: Last pass, does not overwrite stats file
- 3: Nth pass, overwrites stats file
--stats <string> Filename for 2 pass stats ["x264_2pass.log"]
--rceq <string> Ratecontrol equation ["blurCplx^(1-qComp)"]
--qcomp <float> QP curve compression: 0.0 => CBR, 1.0 => CQP [0.60]
--cplxblur <float> Reduce fluctuations in QP (before curve compression) [20.0]
--qblur <float> Reduce fluctuations in QP (after curve compression) [0.5]
--zones <zone0>/<zone1>/... Tweak the bitrate of some regions of the video
Each zone is of the form
<start frame>,<end frame>,<option>
where <option> is either
q=<integer> (force QP)
or b=<float> (bitrate multiplier)
--qpfile <string> Force frametypes and QPs
Analysis:
-A, --partitions <string> Partitions to consider ["p8x8,b8x8,i8x8,i4x4"]
- p8x8, p4x4, b8x8, i8x8, i4x4
- none, all
(p4x4 requires p8x8. i8x8 requires --8x8dct.)
--direct <string> Direct MV prediction mode ["spatial"]
- none, spatial, temporal, auto
--direct-8x8 <-1|0|1> Direct prediction size [-1]
- 0: 4x4
- 1: 8x8
- -1: smallest possible according to level
-w, --weightb Weighted prediction for B-frames
--me <string> Integer pixel motion estimation method ["hex"]
- dia: diamond search, radius 1 (fast)
- hex: hexagonal search, radius 2
- umh: uneven multi-hexagon search
- esa: exhaustive search
- tesa: hadamard exhaustive search (slow)
--merange <integer> Maximum motion vector search range [16]
--mvrange <integer> Maximum motion vector length [-1 (auto)]
--mvrange-thread <int> Minimum buffer between threads [-1 (auto)]
-m, --subme <integer> Subpixel motion estimation and partition
decision quality: 1=fast, 7=best. [5]
--me-prepass Run an ME prepass on predictors. Requires subme 3 or higher.
--b-rdo RD based mode decision for B-frames. Requires subme 6 or higher.
--mixed-refs Decide references on a per partition basis
--no-chroma-me Ignore chroma in motion estimation
--bime Jointly optimize both MVs in B-frames
-8, --8x8dct Adaptive spatial transform size
-t, --trellis <integer> Trellis RD quantization. Requires CABAC. [0]
- 0: disabled
- 1: enabled only on the final encode of a MB
- 2: enabled on all mode decisions
--no-fast-pskip Disables early SKIP detection on P-frames
--no-dct-decimate Disables coefficient thresholding on P-frames
--nr <integer> Noise reduction [0]
--deadzone-inter <int> Set the size of the inter luma quantization deadzone [21]
--deadzone-intra <int> Set the size of the intra luma quantization deadzone [11]
Deadzones should be in the range 0 - 32.
--cqm <string> Preset quant matrices ["flat"]
- jvt, flat
--cqmfile <string> Read custom quant matrices from a JM-compatible file
Overrides any other --cqm* options.
--cqm4 <list> Set all 4x4 quant matrices
Takes a comma-separated list of 16 integers.
--cqm8 <list> Set all 8x8 quant matrices
Takes a comma-separated list of 64 integers.
--cqm4i, --cqm4p, --cqm8i, --cqm8p
Set both luma and chroma quant matrices
--cqm4iy, --cqm4ic, --cqm4py, --cqm4pc
Set individual quant matrices
Video Usability Info (Annex E):
The VUI settings are not used by the encoder but are merely suggestions to
the playback equipment. See doc/vui.txt for details. Use at your own risk.
--overscan <string> Specify crop overscan setting ["undef"]
- undef, show, crop
--videoformat <string> Specify video format ["undef"]
- component, pal, ntsc, secam, mac, undef
--fullrange <string> Specify full range samples setting ["off"]
- off, on
--colorprim <string> Specify color primaries ["undef"]
- undef, bt709, bt470m, bt470bg
smpte170m, smpte240m, film
--transfer <string> Specify transfer characteristics ["undef"]
- undef, bt709, bt470m, bt470bg, linear,
log100, log316, smpte170m, smpte240m
--colormatrix <string> Specify color matrix setting ["undef"]
- undef, bt709, fcc, bt470bg
smpte170m, smpte240m, GBR, YCgCo
--chromaloc <integer> Specify chroma sample location (0 to 5) [0]
Input/Output:
-o, --output 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)
-v, --verbose Print stats for each frame
--progress Show a progress indicator while encoding
--quiet Quiet Mode
--no-psnr Disable PSNR computation
--no-ssim Disable SSIM computation
--threads <integer> Parallel encoding
--thread-input Run Avisynth in its own thread
--non-deterministic Slightly improve quality of SMP, at the cost of repeatability
--no-asm Disable all CPU optimizations
--visualize Show MB types overlayed on the encoded video
--sps-id <integer> Set SPS and PPS id numbers [0]
--aud Use access unit delimiters
--nal-hrd Use NAL HRD parameters
--pulldown <integer> Use 3:2 pulldown
- 32: TBT,BT,BTB,BT pattern
- 64: triple,double *recommended for 720p