Provided by: x265_2.9-4_amd64 bug

NAME

       x256 - encoder for creating H.265/HEVC video streams

SYNOPSIS

       x265 [options] infile [-o] outfile

DESCRIPTION

       x256 is a commandline encoder for creating H.265/High Efficiency Video Coding (HEVC) video
       streams. infile can be a YUV or Y4M video stream.  outfile will be used to store  the  raw
       HEVC bitstream.

   Executable Options:
       -h/--help
              Show this help text and exit

   Output Options:
       -o/--output <filename>
              Bitstream output file name

       --log-level <string>
              Logging level: none error warning info debug full. Default info

       --no-progress
              Disable CLI progress reports

       --[no-]cu-stats
              Enable logging stats about distribution of cu across all modes. Default disabled

       --csv <filename>
              Comma separated log file, log level >= 3 frame log, else one line per run

   Input Options:
       --input <filename>
              Raw YUV or Y4M input file name. `-` for stdin

       --y4m  Force parsing of input stream as YUV4MPEG2 regardless of file extension

       --fps <float|rational>
              Source frame rate (float or num/denom), auto-detected if Y4M

       --input-res WxH
              Source picture size [w x h], auto-detected if Y4M

       --input-depth <integer>
              Bit-depth of input file. Default 8

       --input-csp <string>
              Source color space: i420, i444 or i422, auto-detected if Y4M. Default: i420

       -f/--frames <integer>
              Maximum number of frames to encode. Default all

       --seek <integer>
              First frame to encode

       --[no-]interlace <bff|tff>
              Indicate input pictures are interlace fields in temporal order. Default progressive

       --dither
              Enable dither if downscaling to 8 bit pixels. Default disabled

   Quality reporting metrics:
       --[no-]ssim
              Enable reporting SSIM metric scores. Default disabled

       --[no-]psnr
              Enable reporting PSNR metric scores. Default disabled

   Profile, Level, Tier:
       --profile <string>
              Enforce an encode profile: main, main10, mainstillpicture

       --level-idc <integer|float>
              Force a minimum required decoder level (as '5.0' or '50')

       --[no-]high-tier
              If a decoder level is specified, this modifier selects High tier of that level

   Threading, performance:
       --threads <integer>
              Number of threads for thread pool (0: detect CPU core count, default)

       -F/--frame-threads <integer>
              Number of concurrently encoded frames. 0: auto-determined by core count

       --[no-]wpp
              Enable Wavefront Parallel Processing. Default enabled

       --[no-]pmode
              Parallel mode analysis. Default disabled

       --[no-]pme
              Parallel motion estimation. Default disabled

       --[no-]asm <bool|int|string>
              Override CPU detection. Default: auto

   Presets:
       -p/--preset <string>
              Trade off performance for compression efficiency. Default medium

              ultrafast,  superfast,  veryfast,  faster, fast, medium, slow, slower, veryslow, or
              placebo

       -t/--tune <string>
              Tune the settings for a particular type of source or situation:

              psnr, ssim, zerolatency, or fastdecode

   Quad-Tree size and depth:
       -s/--ctu <64|32|16>
              Maximum CU size (default: 64x64). Default 64

       --tu-intra-depth <integer>
              Max TU recursive depth for intra CUs. Default 1

       --tu-inter-depth <integer>
              Max TU recursive depth for inter CUs. Default 1

       --[no-]rect
              Enable rectangular motion partitions Nx2N and 2NxN. Default disabled

       --[no-]amp
              Enable asymmetric motion partitions, requires --rect. Default disabled

   Analysis:
       --rd <0..6>
              Level of RD in mode decision 0:least....6:full RDO. Default 3

       --psy-rd <0..2.0>
              Strength of psycho-visual rate  distortion  optimization,  0  to  disable.  Default
              0.000000

       --psy-rdoq <0..50.0>
              Strength  of  psycho-visual  optimization  in  quantization,  0 to disable. Default
              0.000000

       --nr <integer>
              An integer value in  range  of  100  to  1000,  which  denotes  strength  of  noise
              reduction. Default disabled

       --[no-]tskip-fast
              Enable fast intra transform skipping. Default disabled

       --[no-]early-skip
              Enable early SKIP detection. Default disabled

       --[no-]fast-cbf
              Enable early outs based on whether residual is coded. Default disabled

   Coding tools:
       -w/--[no-]weightp
              Enable weighted prediction in P slices. Default enabled

       --[no-]weightb
              Enable weighted prediction in B slices. Default disabled

       --[no-]cu-lossless
              Consider lossless mode in CU RDO decisions. Default disabled

       --[no-]signhide
              Hide sign bit of one coeff per TU (rdo). Default enabled

       --[no-]tskip
              Enable intra 4x4 transform skipping. Default disabled

   Temporal / motion search options:
       --me <string>
              Motion search method dia hex umh star full. Default 1

       -m/--subme <integer>
              Amount of subpel refinement to perform (0:least .. 7:most). Default 2

       --merange <integer>
              Motion search range. Default 57

       --max-merge <1..5>
              Maximum number of merge candidates. Default 2

       --[no-]temporal-mvp
              Enable temporal MV predictors. Default enabled

   Spatial / intra options:
       --[no-]strong-intra-smoothing  Enable  strong  intra  smoothing  for 32x32 blocks. Default
              enabled

       --[no-]constrained-intra
              Constrained intra prediction  (use  only  intra  coded  reference  pixels)  Default
              disabled

       --[no-]b-intra
              Enable intra in B frames in veryslow presets. Default disabled

       --[no-]fast-intra
              Enable faster search method for angular intra predictions. Default disabled

       --rdpenalty <0..2>
              penalty  for  32x32  intra  TU  in non-I slices. 0:disabled 1:RD-penalty 2:maximum.
              Default 0

   Slice decision options:
       --[no-]open-gop
              Enable open-GOP, allows I slices to be non-IDR. Default enabled

       -I/--keyint <integer>
              Max IDR period in frames. -1 for infinite-gop. Default 250

       -i/--min-keyint <integer>
              Scenecuts closer together than this are coded as I, not IDR. Default: auto

       --no-scenecut
              Disable adaptive I-frame decision

       --scenecut <integer>
              How aggressively to insert extra I-frames. Default 40

       --rc-lookahead <integer>
              Number of frames for frame-type lookahead (determines encoder latency) Default 20

       --bframes <integer>
              Maximum number of consecutive b-frames  (now  it  only  enables  B  GOP  structure)
              Default 4

       --bframe-bias <integer>
              Bias towards B frame decisions. Default 0

       --b-adapt <0..2>
              0 - none, 1 - fast, 2 - full (trellis) adaptive B frame scheduling. Default 2

       --[no-]b-pyramid
              Use B-frames as references. Default enabled

       --ref <integer>
              max number of L0 references to be allowed (1 .. 16) Default 3

       --qpfile <string>
              Force  frametypes  and  QPs for some or all frames Format of each line: framenumber
              frametype QP QP is optional (none lets x265 choose).  Frametypes:  I,i,P,B,b.   QPs
              are restricted by qpmin/qpmax.

   Rate control, Quantization:
       --bitrate <integer>
              Target bitrate (kbps) for ABR (implied). Default 0

       -q/--qp <integer>
              QP  for  P  slices  in CQP mode (implied). --ipratio and --pbration determine other
              slice QPs

       --crf <float>
              Quality-based VBR (0-51). Default 28.000000

       --[no-]lossless
              Enable lossless:  bypass  transform,  quant  and  loop  filters  globally.  Default
              disabled

       --crf-max <float>
              With CRF+VBV, limit RF to this value. Default 0.000000 May cause VBV underflows!

       --crf-min <float>
              With  CRF+VBV,  limit  RF  to this value. Default 0.000000 this specifies a minimum
              rate factor value for encode!

       --vbv-maxrate <integer>
              Max local bitrate (kbit/s). Default 0

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

       --vbv-init <float>
              Initial VBV buffer occupancy (fraction of bufsize or in kbits). Default 0.900000

       --aq-mode <integer>
              Mode for Adaptive Quantization - 0:none 1:uniform AQ 2:auto variance. Default 2

       --aq-strength <float>
              Reduces blocking and blurring in  flat  and  textured  areas.(0  to  3.0).  Default
              1.000000

       --[no-]cutree
              Enable cutree for Adaptive Quantization. Default enabled

       --ipratio <float>
              QP factor between I and P. Default 1.400000

       --pbratio <float>
              QP factor between P and B. Default 1.300000

       --cbqpoffs <integer>
              Chroma Cb QP Offset. Default 0

       --crqpoffs <integer>
              Chroma Cr QP Offset. Default 0

       --stats
              Filename for stats file in multipass pass rate control. Default x265_2pass.log

       --pass Multi  pass rate control.  1: First pass, creates stats file 2: Last pass, does not
              overwrite stats file 3: Nth pass, overwrites stats file

       --[no-]slow-firstpass
              Enable a slow first pass in a multipass rate control mode. Default disabled

       --analysis-mode <string|int>
              save - Dump analysis info into file, load - Load analysis buffers  from  the  file.
              Default 0

       --analysis-file <filename>
              Specify file name used for either dumping or reading analysis data.

       --scaling-list <string>
              Specify  a  file  containing  HM  style  quant scaling lists or 'default' or 'off'.
              Default: off

       --lambda-file <string>
              Specify a file containing replacement values for  the  lambda  tables  MAX_MAX_QP+1
              floats  for  lambda  table,  then  again  for  lambda2  table Blank lines and lines
              starting with hash(#) are ignored Comma is considered to be white-space

   Loop filters (deblock and SAO):
       --[no-]lft
              Enable Deblocking Loop Filter. Default enabled

       --[no-]sao
              Enable Sample Adaptive Offset. Default enabled

       --[no-]sao-non-deblock
              Use  non-deblocked  pixels,  else  right/bottom  boundary  areas  skipped.  Default
              disabled

   VUI options:
       --sar <width:height|int>
              Sample  Aspect  Ratio, the ratio of width to height of an individual pixel.  Choose
              from  0=undef,  1=1:1("square"),  2=12:11,  3=10:11,  4=16:11,  5=40:33,   6=24:11,
              7=20:11, 8=32:11, 9=80:33, 10=18:11, 11=15:11, 12=64:33, 13=160:99, 14=4:3, 15=3:2,
              16=2:1 or custom ratio of <int:int>. Default 0

       --crop-rect <string>
              Add 'left,top,right,bottom' to the bitstream-level cropping rectangle

       --overscan <string>
              Specify whether it is appropriate for decoder to show cropped region:  undef,  show
              or crop. Default undef

       --videoformat <string>
              Specify video format from undef, component, pal, ntsc, secam, mac. Default undef

       --range <string>
              Specify black level and range of luma and chroma signals as full or limited Default
              limited

       --colorprim <string>
              Specify color primaries from undef, bt709, bt470m, bt470bg,  smpte170m,  smpte240m,
              film, bt2020. Default undef

       --transfer <string>
              Specify  transfer  characteristics  from  undef, bt709, bt470m, bt470bg, smpte170m,
              smpte240m, linear, log100, log316, iec61966-2-4, bt1361e, iec61966-2-1,  bt2020-10,
              bt2020-12. Default undef

       --colormatrix <string>
              Specify color matrix setting from undef, bt709, fcc, bt470bg, smpte170m, smpte240m,
              GBR, YCgCo, bt2020nc, bt2020c. Default undef

       --chromaloc <integer>
              Specify chroma sample location (0 to 5). Default of 0

   Bitstream options:
       --[no-]info
              Emit SEI identifying encoder and parameters. Default enabled

       --[no-]aud
              Emit access unit delimiters at the start of each access unit. Default disabled

       --[no-]hrd
              Enable HRD parameters signalling. Default disabled

       --[no-]repeat-headers
              Emit SPS and PPS headers at each keyframe. Default disabled

       --hash <integer>
              Decoded Picture Hash SEI 0: disabled, 1: MD5, 2: CRC, 3: Checksum. Default 0

   Reconstructed video options (debugging):
       -r/--recon <filename>
              Reconstructed raw image YUV or Y4M output file name

       --recon-depth <integer>
              Bit-depth of reconstructed raw image file. Defaults to input bit depth, or 8 if Y4M

SEE ALSO

       Full documentation may be found at http://x265.readthedocs.org/en/default/cli.html.