newfront/x264 encoding options

## x264 encoding options
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 Avisynth if compiled with support (no).
  or libav* formats if compiled with lavf support (no) or ffms support (no).
Outfile type is selected by filename:
 .264 -> Raw bytestream
 .mkv -> Matroska
 .flv -> Flash Video
 .mp4 -> MP4 if compiled with GPAC support (no)

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 --crf 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               Force the limits of an H.264 profile [high]
                                  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.
      --preset                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 --ref 1 --scenecut 0
                                    --subme 0 --trellis 0 --no-weightb
                                    --weightp 0
                                  - superfast:
                                    --no-mbtree --me dia --no-mixed-refs
                                    --partitions i8x8,i4x4 --ref 1
                                    --subme 1 --trellis 0 --weightp 0
                                  - veryfast:
                                    --no-mbtree --no-mixed-refs --ref 1
                                    --subme 2 --trellis 0 --weightp 0
                                  - faster:
                                    --no-mixed-refs --rc-lookahead 20
                                    --ref 2 --subme 4 --weightp 1
                                  - fast:
                                    --rc-lookahead 30 --ref 2 --subme 6
                                  - medium:
                                    Default settings apply.
                                  - slow:
                                    --b-adapt 2 --direct auto --me umh
                                    --rc-lookahead 50 --ref 5 --subme 8
                                  - 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 10
                                    --trellis 2
      --tune                  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 --rc-lookahead 0
                                    --sync-lookahead 0 --sliced-threads
      --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>      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)
      --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
      --slice-max-size <integer> Limit the size of each slice in bytes
      --slice-max-mbs <integer> Limit the size of each slice in macroblocks
      --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.

Ratecontrol:

  -q, --qp <integer>          Force constant QP (0-51, 0=lossless)
  -B, --bitrate <integer>     Set bitrate (kbit/s)
      --crf <float>           Quality-based VBR (0-51, 0=lossless) [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 [10]
      --qpmax <integer>       Set max QP [51]
      --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 (experimental)
      --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 of -1 lets x264 choose. Frametypes: I,i,P,B,b.
                              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: Blind offset
                                  - 2: Smart analysis
      --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
      --psy-rd                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. Requires CABAC. [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"]
                                  - 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]
      --nal-hrd <string>      Signal HRD information (requires vbv-bufsize)
                                  - none, vbr, cbr (cbr not allowed in .mp4)
      --pic-struct            Force pic_struct in Picture Timing SEI

Input/Output:

  -o, --output                Specify output file
      --muxer <string>        Specify output container format ["auto"]
                                  - auto, raw, mkv, flv
      --demuxer <string>      Specify input container format ["auto"]
                                  - auto, yuv, y4m
      --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)

  -v, --verbose               Print stats for each frame
      --no-progress           Don't show the progress indicator while encoding
      --quiet                 Quiet Mode
      --psnr                  Enable PSNR computation
      --ssim                  Enable SSIM computation
      --threads <integer>     Force a specific number of 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
      --asm <integer>         Override CPU detection
      --no-asm                Disable all CPU optimizations
      --visualize             Show MB types overlayed on the encoded video
      --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
	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 Avisynth if compiled with support (no).
	or libav* formats if compiled with lavf support (no) or ffms support (no).
	Outfile type is selected by filename:
	.264 -> Raw bytestream
	.mkv -> Matroska
	.flv -> Flash Video
	.mp4 -> MP4 if compiled with GPAC support (no)

	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 --crf 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 Force the limits of an H.264 profile [high]
	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.
	--preset 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 --ref 1 --scenecut 0
	--subme 0 --trellis 0 --no-weightb
	--weightp 0
	- superfast:
	--no-mbtree --me dia --no-mixed-refs
	--partitions i8x8,i4x4 --ref 1
	--subme 1 --trellis 0 --weightp 0
	- veryfast:
	--no-mbtree --no-mixed-refs --ref 1
	--subme 2 --trellis 0 --weightp 0
	- faster:
	--no-mixed-refs --rc-lookahead 20
	--ref 2 --subme 4 --weightp 1
	- fast:
	--rc-lookahead 30 --ref 2 --subme 6
	- medium:
	Default settings apply.
	- slow:
	--b-adapt 2 --direct auto --me umh
	--rc-lookahead 50 --ref 5 --subme 8
	- 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 10
	--trellis 2
	--tune 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 --rc-lookahead 0
	--sync-lookahead 0 --sliced-threads
	--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> 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)
	--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
	--slice-max-size <integer> Limit the size of each slice in bytes
	--slice-max-mbs <integer> Limit the size of each slice in macroblocks
	--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.

	Ratecontrol:

	-q, --qp <integer> Force constant QP (0-51, 0=lossless)
	-B, --bitrate <integer> Set bitrate (kbit/s)
	--crf <float> Quality-based VBR (0-51, 0=lossless) [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 [10]
	--qpmax <integer> Set max QP [51]
	--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 (experimental)
	--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 of -1 lets x264 choose. Frametypes: I,i,P,B,b.
	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: Blind offset
	- 2: Smart analysis
	--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
	--psy-rd 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. Requires CABAC. [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"]
	- 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]
	--nal-hrd <string> Signal HRD information (requires vbv-bufsize)
	- none, vbr, cbr (cbr not allowed in .mp4)
	--pic-struct Force pic_struct in Picture Timing SEI

	Input/Output:

	-o, --output Specify output file
	--muxer <string> Specify output container format ["auto"]
	- auto, raw, mkv, flv
	--demuxer <string> Specify input container format ["auto"]
	- auto, yuv, y4m
	--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)

	-v, --verbose Print stats for each frame
	--no-progress Don't show the progress indicator while encoding
	--quiet Quiet Mode
	--psnr Enable PSNR computation
	--ssim Enable SSIM computation
	--threads <integer> Force a specific number of 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
	--asm <integer> Override CPU detection
	--no-asm Disable all CPU optimizations
	--visualize Show MB types overlayed on the encoded video
	--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