Provided by: x265_2.9-4_amd64 bug


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


       x265 [options] infile [-o] outfile


       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:
              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

              Disable CLI progress reports

              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

              Enable dither if downscaling to 8 bit pixels. Default disabled

   Quality reporting metrics:
              Enable reporting SSIM metric scores. Default disabled

              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')

              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

              Enable Wavefront Parallel Processing. Default enabled

              Parallel mode analysis. Default disabled

              Parallel motion estimation. Default disabled

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

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

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

       -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

              Enable rectangular motion partitions Nx2N and 2NxN. Default disabled

              Enable asymmetric motion partitions, requires --rect. Default disabled

       --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

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

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

              Enable fast intra transform skipping. Default disabled

              Enable early SKIP detection. Default disabled

              Enable early outs based on whether residual is coded. Default disabled

   Coding tools:
              Enable weighted prediction in P slices. Default enabled

              Enable weighted prediction in B slices. Default disabled

              Consider lossless mode in CU RDO decisions. Default disabled

              Hide sign bit of one coeff per TU (rdo). Default enabled

              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

              Enable temporal MV predictors. Default enabled

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

              Constrained intra prediction  (use  only  intra  coded  reference  pixels)  Default

              Enable intra in B frames in veryslow presets. Default disabled

              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:
              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

              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

              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

              Enable lossless:  bypass  transform,  quant  and  loop  filters  globally.  Default

       --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

              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

              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

              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):
              Enable Deblocking Loop Filter. Default enabled

              Enable Sample Adaptive Offset. Default enabled

              Use  non-deblocked  pixels,  else  right/bottom  boundary  areas  skipped.  Default

   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

       --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:
              Emit SEI identifying encoder and parameters. Default enabled

              Emit access unit delimiters at the start of each access unit. Default disabled

              Enable HRD parameters signalling. Default disabled

              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


       Full documentation may be found at