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x264 core:67 r1163
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).
or any file that can be rendered in DirectShow.
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 Maximum GOP size [250]
-i, --min-keyint Minimum GOP size [6]
--no-scenecut Disable adaptive I-frame decision
--scenecut How aggressively to insert extra I-frames [40]
-b, --bframes Number of B-frames between I and P [0]
--b-adapt Adaptive B-frame decision method [1]
Higher values may lower threading efficiency.
- 0: Disabled
- 1: Fast
- 2: Optimal (slow with high --bframes)
--b-bias Influences how often B-frames are used [0]
--b-pyramid Keep some B-frames as references
--no-cabac Disable CABAC
-r, --ref Number of reference frames [1]
--no-deblock Disable loop filter
-f, --deblock 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 Set QP (0=lossless) [26]
-B, --bitrate Set bitrate (kbit/s)
--crf Quality-based VBR (nominal QP)
--vbv-maxrate Max local bitrate (kbit/s) [0]
--vbv-bufsize Enable CBR and set size of the VBV buffer (kb) [0]
--vbv-init Initial VBV buffer occupancy [0.9]
--qpmin Set min QP [10]
--qpmax Set max QP [51]
--qpstep Set max QP step [4]
--ratetol Allowed variance of average bitrate [1.0]
--ipratio QP factor between I and P [1.40]
--pbratio QP factor between P and B [1.30]
--chroma-qp-offset QP difference between chroma and luma [0]
--aq-mode AQ method [1]
- 0: Disabled
- 1: Variance AQ (complexity mask)
--aq-strength 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 Filename for 2 pass stats ["x264_2pass.log"]
--qcomp QP curve compression: 0.0 => CBR, 1.0 => CQP [0.60]
--cplxblur Reduce fluctuations in QP
(before curve compression) [20.0]
--qblur Reduce fluctuations in QP
(after curve compression) [0.5]
--zones //... Tweak the bitrate of some regions of the video
Each zone is of the form
,,
where
q= (force QP)
or b= (bitrate multiplier)
--qpfile Force frametypes and QPs for some or all frames
Format of each line: framenumber frametype QP
QP of -1 lets x264 choose. Frametypes: I,i,P,B,b.
Analysis:
-A, --partitions Partitions to consider ["p8x8,b8x8,i8x8,i4x4"]
- p8x8, p4x4, b8x8, i8x8, i4x4
- none, all
(p4x4 requires p8x8. i8x8 requires --8x8dct.)
--direct Direct MV prediction mode ["spatial"]
- none, spatial, temporal, auto
-w, --weightb Weighted prediction for B-frames
--me 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 Maximum motion vector search range [16]
--mvrange Maximum motion vector length [-1 (auto)]
--mvrange-thread Minimum buffer between threads [-1 (auto)]
-m, --subme Subpixel motion estimation and mode decision [6]
- 0: fullpel only (not recommended)
- 1: SAD mode decision, one qpel iteration
- 2: SATD mode decision
- 3-5: Progressively more qpel
- 6: RD mode decision for I/P-frames
- 7: RD mode decision for all frames
- 8: RD refinement for I/P-frames
- 9: RD refinement for all frames
--psy-rd Strength of psychovisual optimization ["1.0:0.0"]
#1: RD (requires subme>=6)
#2: Trellis (requires trellis, experimental)
--mixed-refs Decide references on a per partition basis
--no-chroma-me Ignore chroma in motion estimation
-8, --8x8dct Adaptive spatial transform size
-t, --trellis 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 Noise reduction [0]
--deadzone-inter Size of the inter luma quantization deadzone [21]
--deadzone-intra Size of the intra luma quantization deadzone [11]
Deadzones should be in the range 0 - 32.
--cqm Preset quant matrices ["flat"]
- jvt, flat
--cqmfile Custom quant matrices from a JM-compatible file
Overrides any other --cqm* options.
--cqm4 Set all 4x4 quant matrices
Takes a comma-separated list of 16 integers.
--cqm8 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 Specify crop overscan setting ["undef"]
- undef, show, crop
--videoformat Specify video format ["undef"]
- component, pal, ntsc, secam, mac, undef
--fullrange Specify full range samples setting ["off"]
- off, on
--colorprim Specify color primaries ["undef"]
- undef, bt709, bt470m, bt470bg
smpte170m, smpte240m, film
--transfer Specify transfer characteristics ["undef"]
- undef, bt709, bt470m, bt470bg, linear,
log100, log316, smpte170m, smpte240m
--colormatrix Specify color matrix setting ["undef"]
- undef, bt709, fcc, bt470bg
smpte170m, smpte240m, GBR, YCgCo
--chromaloc Specify chroma sample location (0 to 5) [0]
Input/Output:
-o, --output Specify output file
--sar width:height Specify Sample Aspect Ratio
--fps Specify framerate
--seek First frame to encode
--frames Maximum number of frames to encode
--level 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 Parallel encoding
--thread-input Run Avisynth in its own thread
--non-deterministic Slightly improve quality of SMP,
at the cost of repeatability
--asm Override CPU detection
--no-asm Disable all CPU optimizations
--visualize Show MB types overlayed on the encoded video
--dump-yuv Save reconstructed frames
--sps-id Set SPS and PPS id numbers [0]
--swapuv Swap UV planes, only available with RAW YUV input
--timescale Manually set pts timescale [auto]
--timecode Specify output timecode file
--deldup
Enable near duplicate frame remover prefilter
: specify the minimum fps
: luma threshold [0.8]
,: if the number of
8x8 blocks with SAD larger than mbthresh
exceeds mbmax, it will be considered
a non-duplicate frame [400,width/10]
: chroma theshold [lthresh*2]
--smoothts Adjust timestamps so that video plays smoothly
--ivtc Enable field matching pre-filter
require YUY2 input from DirectShow
- a: auto
- t: tff
- b: bff
--sub Load a subtitle using VobSub (need vsfilter.dll)
--starttime Start encoding at specified position
--endtime Stop encoding at specified position
--versioninfo Write version information in stream header
--aud Use access unit delimiters
--nal-hrd Use NAL HRD parameters
--pulldown Use 3:2 pulldown
- 32: TBT,BT,BTB,BT pattern
- 64: triple,double *recommended for 720p