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X264(1) User Commands X264(1)

NAME

x264 - fast h264 encoder

DESCRIPTION

x264 core:160 r3011 cde9a93 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 (yes). or libav* formats if compiled with lavf support (yes) or ffms support (yes).

Outfile type is selected by filename:

.264 -> Raw bytestream .mkv -> Matroska .flv -> Flash Video .mp4 -> MP4 if compiled with GPAC or L-SMASH support (gpac)

Output bit depth: 8/10 . 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:
--no-8x8dct --bframes 0 --no-cabac
--cqm flat --weightp 0 No interlaced. No lossless.
- main:
--no-8x8dct --cqm flat No lossless.
- high:
No lossless.
- high10:
No lossless. Support for bit depth 8-10.
- high422:
No lossless. Support for bit depth 8-10. Support for 4:2:0/4:2:2 chroma subsampling.
- high444:
Support for bit depth 8-10. Support for 4:2:0/4:2:2/4:4:4 chroma subsampling.
--preset <string>
Use a preset to select encoding settings [medium] Overridden by user settings. - ultrafast:
--no-8x8dct --aq-mode 0 --b-adapt 0
--bframes 0 --no-cabac --no-deblock --no-mbtree --me dia --no-mixed-refs --partitions none --rc-lookahead 0 --ref 1 --scenecut 0 --subme 0 --trellis 0 --no-weightb --weightp 0
- superfast:
--no-mbtree --me dia --no-mixed-refs --partitions i8x8,i4x4 --rc-lookahead 0 --ref 1 --subme 1 --trellis 0 --weightp 1
- veryfast:
--no-mixed-refs --rc-lookahead 10 --ref 1 --subme 2 --trellis 0 --weightp 1
- faster:
--no-mixed-refs --rc-lookahead 20 --ref 2 --subme 4 --weightp 1
- fast:
--rc-lookahead 30 --ref 2 --subme 6 --weightp 1
- medium:
Default settings apply.
- slow:
--direct auto --rc-lookahead 50 --ref 5 --subme 8 --trellis 2
- slower:
--b-adapt 2 --direct auto --me umh --partitions all --rc-lookahead 60 --ref 8 --subme 9 --trellis 2
- veryslow:
--b-adapt 2 --bframes 8 --direct auto --me umh --merange 24 --partitions all --ref 16 --subme 10 --trellis 2 --rc-lookahead 60
- placebo:
--bframes 16 --b-adapt 2 --direct auto --slow-firstpass --no-fast-pskip --me tesa --merange 24 --partitions all --rc-lookahead 60 --ref 16 --subme 11 --trellis 2
--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. - film (psy tuning):
--deblock -1:-1 --psy-rd <unset>:0.15
- animation (psy tuning):
--bframes {+2} --deblock 1:1
--psy-rd 0.4:<unset> --aq-strength 0.6 --ref {Double if >1 else 1}
- grain (psy tuning):
--aq-strength 0.5 --no-dct-decimate --deadzone-inter 6 --deadzone-intra 6 --deblock -2:-2 --ipratio 1.1 --pbratio 1.1 --psy-rd <unset>:0.25 --qcomp 0.8
- stillimage (psy tuning):
--aq-strength 1.2 --deblock -3:-3 --psy-rd 2.0:0.7
- psnr (psy tuning):
--aq-mode 0 --no-psy
- ssim (psy tuning):
--aq-mode 2 --no-psy
- fastdecode:
--no-cabac --no-deblock --no-weightb --weightp 0
- zerolatency:
--bframes 0 --force-cfr --no-mbtree --sync-lookahead 0 --sliced-threads --rc-lookahead 0
--slow-firstpass
Don't force these faster settings with --pass 1: --no-8x8dct --me dia --partitions none --ref 1 --subme {2 if >2 else unchanged} --trellis 0 --fast-pskip

Frame-type options:

-I, --keyint <integer or "infinite"> Maximum GOP size [250]

-i, --min-keyint <integer>
Minimum GOP size [auto]
--no-scenecut
Disable adaptive I-frame decision
--scenecut <integer>
How aggressively to insert extra I-frames [40]
--intra-refresh
Use Periodic Intra Refresh instead of IDR frames
-b, --bframes <integer>
Number of B-frames between I and P [3]
--b-adapt <integer>
Adaptive B-frame decision method [1] Higher values may lower threading efficiency. - 0: Disabled - 1: Fast - 2: Optimal (slow with high --bframes)
--b-bias <integer>
Influences how often B-frames are used [0]
--b-pyramid <string>
Keep some B-frames as references [normal] - none: Disabled - strict: Strictly hierarchical pyramid - normal: Non-strict (not Blu-ray compatible)
--open-gop
Use recovery points to close GOPs Only available with b-frames
--no-cabac
Disable CABAC
-r, --ref <integer>
Number of reference frames [3]
--no-deblock
Disable loop filter
-f, --deblock <alpha:beta>
Loop filter parameters [0:0]
--slices <integer>
Number of slices per frame; forces rectangular slices and is overridden by other slicing options
--slices-max <integer>
Absolute maximum slices per frame; overrides slice-max-size/slice-max-mbs when necessary

--slice-max-size <integer> Limit the size of each slice in bytes

--slice-max-mbs <integer> Limit the size of each slice in macroblocks (max)

--slice-min-mbs <integer> Limit the size of each slice in macroblocks (min)

--tff
Enable interlaced mode (top field first)
--bff
Enable interlaced mode (bottom field first)
--constrained-intra
Enable constrained intra prediction.
--pulldown <string>
Use soft pulldown to change frame rate - none, 22, 32, 64, double, triple, euro (requires cfr input)
--fake-interlaced
Flag stream as interlaced but encode progressive. Makes it possible to encode 25p and 30p Blu-Ray streams. Ignored in interlaced mode.
--frame-packing <integer> For stereoscopic videos define frame arrangement
- 0: checkerboard - pixels are alternatively from L and R - 1: column alternation - L and R are interlaced by column - 2: row alternation - L and R are interlaced by row - 3: side by side - L is on the left, R on the right - 4: top bottom - L is on top, R on bottom - 5: frame alternation - one view per frame - 6: mono - 2D frame without any frame packing - 7: tile format - L is on top-left, R split across

Ratecontrol:

-q, --qp <integer>
Force constant QP (0-81, 0=lossless)
-B, --bitrate <integer>
Set bitrate (kbit/s)
--crf <float>
Quality-based VBR (-12-51) [23.0]

--rc-lookahead <integer> Number of frames for frametype lookahead [40]

--vbv-maxrate <integer> Max local bitrate (kbit/s) [0]

--vbv-bufsize <integer> Set size of the VBV buffer (kbit) [0]

--vbv-init <float>
Initial VBV buffer occupancy [0.9]
--crf-max <float>
With CRF+VBV, limit RF to this value May cause VBV underflows!
--qpmin <integer>
Set min QP [0]
--qpmax <integer>
Set max QP [81]
--qpstep <integer>
Set max QP step [4]
--ratetol <float>
Tolerance of ABR ratecontrol and VBV [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>
AQ method [1] - 0: Disabled - 1: Variance AQ (complexity mask) - 2: Auto-variance AQ - 3: Auto-variance AQ with bias to dark scenes
--aq-strength <float>
Reduces blocking and blurring in flat and textured areas. [1.0]
-p, --pass <integer>
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"]
--no-mbtree
Disable mb-tree ratecontrol.
--qcomp <float>
QP curve compression [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 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 for some or all frames Format of each line: framenumber frametype QP QP is optional (none lets x264 choose). Frametypes: I,i,K,P,B,b.
K=<I or i> depending on open-gop setting
QPs are restricted by qpmin/qpmax.

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
--no-weightb
Disable weighted prediction for B-frames
--weightp <integer>
Weighted prediction for P-frames [2] - 0: Disabled - 1: Weighted refs - 2: Weighted refs + Duplicates
--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 mode decision [7] - 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 - 10: QP-RD - requires trellis=2, aq-mode>0 - 11: Full RD: disable all early terminations
--psy-rd <float:float>
Strength of psychovisual optimization ["1.0:0.0"] #1: RD (requires subme>=6) #2: Trellis (requires trellis, experimental)
--no-psy
Disable all visual optimizations that worsen both PSNR and SSIM.
--no-mixed-refs
Don't decide references on a per partition basis
--no-chroma-me
Ignore chroma in motion estimation
--no-8x8dct
Disable adaptive spatial transform size
-t, --trellis <integer>
Trellis RD quantization. [1] - 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"] - flat, jvt
--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 <list>
Set both luma and chroma quant matrices
--cqm4iy, --cqm4ic, --cqm4py, --cqm4pc <list>
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
--range <string>
Specify color range ["auto"] - auto, tv, pc
--colorprim <string>
Specify color primaries ["undef"] - undef, bt709, bt470m, bt470bg, smpte170m,
smpte240m, film, bt2020, smpte428,
smpte431, smpte432
--transfer <string>
Specify transfer characteristics ["undef"] - undef, bt709, bt470m, bt470bg, smpte170m,
smpte240m, linear, log100, log316,
iec61966-2-4, bt1361e, iec61966-2-1, bt2020-10, bt2020-12, smpte2084, smpte428, arib-std-b67
--colormatrix <string>
Specify color matrix setting ["???"] - undef, bt709, fcc, bt470bg, smpte170m,
smpte240m, GBR, YCgCo, bt2020nc, bt2020c,
smpte2085, chroma-derived-nc, chroma-derived-c, ICtCp
--chromaloc <integer>
Specify chroma sample location (0 to 5) [0]
--alternative-transfer <string> Specify an alternative transfer
characteristics ["undef"]
- same values as --transfer
--nal-hrd <string>
Signal HRD information (requires vbv-bufsize) - none, vbr, cbr (cbr not allowed in .mp4)
--filler
Force hard-CBR and generate filler (implied by --nal-hrd cbr)
--pic-struct
Force pic_struct in Picture Timing SEI
--crop-rect <string>
Add 'left,top,right,bottom' to the bitstream-level cropping rectangle

Input/Output:

-o, --output <string>
Specify output file
--muxer <string>
Specify output container format ["auto"] - auto, raw, mkv, flv, mp4
--demuxer <string>
Specify input container format ["auto"] - auto, raw, y4m, avs, lavf, ffms
--input-fmt <string>
Specify input file format (requires lavf support)
--input-csp <string>
Specify input colorspace format for raw input - valid csps for `raw' demuxer:
i400, i420, yv12, nv12, nv21, i422, yv16, nv16,
yuyv, uyvy, i444, yv24, bgr, bgra, rgb
- valid csps for `lavf' demuxer:
yuv420p, yuyv422, rgb24, bgr24, yuv422p, yuv444p, yuv410p, yuv411p, gray, monow, monob, pal8, yuvj420p, yuvj422p, yuvj444p, uyvy422, uyyvyy411, bgr8, bgr4, bgr4_byte, rgb8, rgb4, rgb4_byte, nv12, nv21, argb, rgba, abgr, bgra, gray16be, gray16le, yuv440p, yuvj440p, yuva420p, rgb48be, rgb48le, rgb565be, rgb565le, rgb555be, rgb555le, bgr565be, bgr565le, bgr555be, bgr555le, vaapi_moco, vaapi_idct, vaapi_vld, yuv420p16le, yuv420p16be, yuv422p16le, yuv422p16be, yuv444p16le, yuv444p16be, dxva2_vld, rgb444le, rgb444be, bgr444le, bgr444be, ya8, bgr48be, bgr48le, yuv420p9be, yuv420p9le, yuv420p10be, yuv420p10le, yuv422p10be, yuv422p10le, yuv444p9be, yuv444p9le, yuv444p10be, yuv444p10le, yuv422p9be, yuv422p9le, gbrp, gbrp9be, gbrp9le, gbrp10be, gbrp10le, gbrp16be, gbrp16le, yuva422p, yuva444p, yuva420p9be, yuva420p9le, yuva422p9be, yuva422p9le, yuva444p9be, yuva444p9le, yuva420p10be, yuva420p10le, yuva422p10be, yuva422p10le, yuva444p10be, yuva444p10le, yuva420p16be, yuva420p16le, yuva422p16be, yuva422p16le, yuva444p16be, yuva444p16le, vdpau, xyz12le, xyz12be, nv16, nv20le, nv20be, rgba64be, rgba64le, bgra64be, bgra64le, yvyu422, ya16be, ya16le, gbrap, gbrap16be, gbrap16le, qsv, mmal, d3d11va_vld, cuda, 0rgb, rgb0, 0bgr, bgr0, yuv420p12be, yuv420p12le, yuv420p14be, yuv420p14le, yuv422p12be, yuv422p12le, yuv422p14be, yuv422p14le, yuv444p12be, yuv444p12le, yuv444p14be, yuv444p14le, gbrp12be, gbrp12le, gbrp14be, gbrp14le, yuvj411p, bayer_bggr8, bayer_rggb8, bayer_gbrg8, bayer_grbg8, bayer_bggr16le, bayer_bggr16be, bayer_rggb16le, bayer_rggb16be, bayer_gbrg16le, bayer_gbrg16be, bayer_grbg16le, bayer_grbg16be, xvmc, yuv440p10le, yuv440p10be, yuv440p12le, yuv440p12be, ayuv64le, ayuv64be, videotoolbox_vld, p010le, p010be, gbrap12be, gbrap12le, gbrap10be, gbrap10le, mediacodec, gray12be, gray12le, gray10be, gray10le, p016le, p016be, d3d11, gray9be, gray9le, gbrpf32be, gbrpf32le, gbrapf32be, gbrapf32le, drm_prime, opencl, gray14be, gray14le, grayf32be, grayf32le, yuva422p12be, yuva422p12le, yuva444p12be, yuva444p12le, nv24, nv42, vulkan, y210be, y210le
--output-csp <string>
Specify output colorspace ["i420"] - i400, i420, i422, i444, rgb

--input-depth <integer> Specify input bit depth for raw input

--output-depth <integer> Specify output bit depth

--input-range <string>
Specify input color range ["auto"] - auto, tv, pc
--input-res <intxint>
Specify input resolution (width x height)
--index <string>
Filename for input index 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)
--bluray-compat
Enable compatibility hacks for Blu-ray support
--avcintra-class <integer> Use compatibility hacks for AVC-Intra class
- 50, 100, 200
--avcintra-flavor <string> AVC-Intra flavor ["panasonic"]
- panasonic, sony
--stitchable
Don't optimize headers based on video content Ensures ability to recombine a segmented encode
-v, --verbose
Print stats for each frame
--no-progress
Don't show the progress indicator while encoding
--quiet
Quiet Mode
--log-level <string>
Specify the maximum level of logging ["info"] - none, error, warning, info, debug
--psnr
Enable PSNR computation
--ssim
Enable SSIM computation
--threads <integer>
Force a specific number of threads

--lookahead-threads <integer> Force a specific number of lookahead threads

--sliced-threads
Low-latency but lower-efficiency threading
--thread-input
Run Avisynth in its own thread

--sync-lookahead <integer> Number of buffer frames for threaded lookahead

--non-deterministic
Slightly improve quality of SMP, at the cost of repeatability
--cpu-independent
Ensure exact reproducibility across different cpus, as opposed to letting them select different algorithms
--asm <integer>
Override CPU detection
--no-asm
Disable all CPU optimizations
--opencl
Enable use of OpenCL

--opencl-clbin <string> Specify path of compiled OpenCL kernel cache

--opencl-device <integer> Specify OpenCL device ordinal

--dump-yuv <string>
Save reconstructed frames
--sps-id <integer>
Set SPS and PPS id numbers [0]
--aud
Use access unit delimiters
--force-cfr
Force constant framerate timestamp generation
--tcfile-in <string>
Force timestamp generation with timecode file
--tcfile-out <string>
Output timecode v2 file from input timestamps
--timebase <int/int>
Specify timebase numerator and denominator
<integer>
Specify timebase numerator for input timecode file or specify timebase denominator for other input
--dts-compress
Eliminate initial delay with container DTS hack

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
removes pixels from the edges of the frame
resize:[width,height][,sar][,fittobox][,csp][,method]
resizes frames based on the given criteria: - resolution only: resizes and adapts sar to avoid stretching - sar only: sets the sar and resizes to avoid stretching - resolution and sar: resizes to given resolution and sets the sar - fittobox: resizes the video based on the desired constraints
- width, height, both
- fittobox and sar: same as above except with specified sar - csp: convert to the given csp. syntax: [name][:depth]
- valid csp names [keep current]: i400, i420, yv12, nv12, nv21, i422, yv16, nv16, yuyv, uyvy, i444, yv24, bgr, bgra, rgb - depth: 8 or 16 bits per pixel [keep current]
note: not all depths are supported by all csps. - method: use resizer method ["bicubic"]
- fastbilinear, bilinear, bicubic, experimental, point, - area, bicublin, gauss, sinc, lanczos, spline
select_every:step,offset1[,...]
apply a selection pattern to input frames step: the number of frames in the pattern offsets: the offset into the step to select a frame see: http://avisynth.nl/index.php/Select#SelectEvery

(libswscale 5.7.100) (libavformat 58.45.100) (ffmpegsource 2.23.0.0) built on Jul 13 2020, gcc: 9.3.0 x264 configuration: --chroma-format=all libx264 configuration: --chroma-format=all x264 license: GPL version 2 or later libswscale/libavformat/ffmpegsource license: GPL version 2 or later

July 2020 Videolan project