1. ffmpeg -h 这个命令总不会忘记，用这个先将ffmpeg所有的help信息都list出来
C:\Users\Administrator>ffmpeg -h
ffmpeg version 6.0-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-shared --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 58. 2.100 / 58. 2.100
libavcodec 60. 3.100 / 60. 3.100
libavformat 60. 3.100 / 60. 3.100
libavdevice 60. 1.100 / 60. 1.100
libavfilter 9. 3.100 / 9. 3.100
libswscale 7. 1.100 / 7. 1.100
libswresample 4. 10.100 / 4. 10.100
libpostproc 57. 1.100 / 57. 1.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
Getting help:
-h -- print basic options
-h long -- print more options
-h full -- print all options (including all format and codec specific options, very long)
-h type=name -- print all options for the named decoder/encoder/demuxer/muxer/filter/bsf/protocol
See man ffmpeg for detailed description of the options.
Print help / information / capabilities:
-L show license
-h topic show help
-? topic show help
-help topic show help
--help topic show help
-version show version
-buildconf show build configuration
-formats show available formats
-muxers show available muxers
-demuxers show available demuxers
-devices show available devices
-codecs show available codecs
-decoders show available decoders
-encoders show available encoders
-bsfs show available bit stream filters
-protocols show available protocols
-filters show available filters
-pix_fmts show available pixel formats
-layouts show standard channel layouts
-sample_fmts show available audio sample formats
-dispositions show available stream dispositions
-colors show available color names
-sources device list sources of the input device
-sinks device list sinks of the output device
-hwaccels show available HW acceleration methods
Global options (affect whole program instead of just one file):
-loglevel loglevel set logging level
-v loglevel set logging level
-report generate a report
-max_alloc bytes set maximum size of a single allocated block
-y overwrite output files
-n never overwrite output files
-ignore_unknown Ignore unknown stream types
-filter_threads number of non-complex filter threads
-filter_complex_threads number of threads for -filter_complex
-stats print progress report during encoding
-max_error_rate maximum error rate ratio of decoding errors (0.0: no errors, 1.0: 100% errors) above which ffmpeg returns an error instead of success.
Per-file main options:
-f fmt force format
-c codec codec name
-codec codec codec name
-pre preset preset name
-map_metadata outfile[,metadata]:infile[,metadata] set metadata information of outfile from infile
-t duration record or transcode "duration" seconds of audio/video
-to time_stop record or transcode stop time
-fs limit_size set the limit file size in bytes
-ss time_off set the start time offset
-sseof time_off set the start time offset relative to EOF
-seek_timestamp enable/disable seeking by timestamp with -ss
-timestamp time set the recording timestamp ('now' to set the current time)
-metadata string=string add metadata
-program title=string:st=number... add program with specified streams
-target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc-" or "film-")
-apad audio pad
-frames number set the number of frames to output
-filter filter_graph set stream filtergraph
-filter_script filename read stream filtergraph description from a file
-reinit_filter reinit filtergraph on input parameter changes
-discard discard
-disposition disposition
Video options:
-vframes number set the number of video frames to output
-r rate set frame rate (Hz value, fraction or abbreviation)
-fpsmax rate set max frame rate (Hz value, fraction or abbreviation)
-s size set frame size (WxH or abbreviation)
-aspect aspect set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
-display_rotation angle set pure counter-clockwise rotation in degrees for stream(s)
-display_hflip set display horizontal flip for stream(s) (overrides any display rotation if it is not set)
-display_vflip set display vertical flip for stream(s) (overrides any display rotation if it is not set)
-vn disable video
-vcodec codec force video codec ('copy' to copy stream)
-timecode hh:mm:ss[:;.]ff set initial TimeCode value.
-pass n select the pass number (1 to 3)
-vf filter_graph set video filters
-b bitrate video bitrate (please use -b:v)
-dn disable data
Audio options:
-aframes number set the number of audio frames to output
-aq quality set audio quality (codec-specific)
-ar rate set audio sampling rate (in Hz)
-ac channels set number of audio channels
-an disable audio
-acodec codec force audio codec ('copy' to copy stream)
-ab bitrate audio bitrate (please use -b:a)
-af filter_graph set audio filters
Subtitle options:
-s size set frame size (WxH or abbreviation)
-sn disable subtitle
-scodec codec force subtitle codec ('copy' to copy stream)
-stag fourcc/tag force subtitle tag/fourcc
-fix_sub_duration fix subtitles duration
-canvas_size size set canvas size (WxH or abbreviation)
-spre preset set the subtitle options to the indicated preset
2. 查看x264的编码器的详情 ffmpeg -codecs | findstr x264
DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
(decoders: h264 h264_qsv h264_cuvid )
(encoders: libx264 libx264rgb h264_amf h264_mf h264_nvenc h264_qsv )我们可以看到encoders 默认的第一个就是 libx264
3. 再查看 libx264具体的的帮忙文档 ffmpeg -h encoder=libx264
Encoder libx264 [libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10]:
General capabilities: dr1 delay threads
Threading capabilities: other
Supported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16 nv21 yuv420p10le yuv422p10le yuv444p10le nv20le gray gray10le
libx264 AVOptions:
-preset <string> E..V....... Set the encoding preset (cf. x264 --fullhelp) (default "medium")
-tune <string> E..V....... Tune the encoding params (cf. x264 --fullhelp)
-profile <string> E..V....... Set profile restrictions (cf. x264 --fullhelp)
-fastfirstpass <boolean> E..V....... Use fast settings when encoding first pass (default true)
-level <string> E..V....... Specify level (as defined by Annex A)
-passlogfile <string> E..V....... Filename for 2 pass stats
-wpredp <string> E..V....... Weighted prediction for P-frames
-a53cc <boolean> E..V....... Use A53 Closed Captions (if available) (default true)
-x264opts <string> E..V....... x264 options
-crf <float> E..V....... Select the quality for constant quality mode (from -1 to FLT_MAX) (default -1)
-crf_max <float> E..V....... In CRF mode, prevents VBV from lowering quality beyond this point. (from -1 to FLT_MAX) (default -1)
-qp <int> E..V....... Constant quantization parameter rate control method (from -1 to INT_MAX) (default -1)
-aq-mode <int> E..V....... AQ method (from -1 to INT_MAX) (default -1)
none 0 E..V.......
variance 1 E..V....... Variance AQ (complexity mask)
autovariance 2 E..V....... Auto-variance AQ
autovariance-biased 3 E..V....... Auto-variance AQ with bias to dark scenes
-aq-strength <float> E..V....... AQ strength. Reduces blocking and blurring in flat and textured areas. (from -1 to FLT_MAX) (default -1)
-psy <boolean> E..V....... Use psychovisual optimizations. (default auto)
-psy-rd <string> E..V....... Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format.
-rc-lookahead <int> E..V....... Number of frames to look ahead for frametype and ratecontrol (from -1 to INT_MAX) (default -1)
-weightb <boolean> E..V....... Weighted prediction for B-frames. (default auto)
-weightp <int> E..V....... Weighted prediction analysis method. (from -1 to INT_MAX) (default -1)
none 0 E..V.......
simple 1 E..V.......
smart 2 E..V.......
-ssim <boolean> E..V....... Calculate and print SSIM stats. (default auto)
-intra-refresh <boolean> E..V....... Use Periodic Intra Refresh instead of IDR frames. (default auto)
-bluray-compat <boolean> E..V....... Bluray compatibility workarounds. (default auto)
-b-bias <int> E..V....... Influences how often B-frames are used (from INT_MIN to INT_MAX) (default INT_MIN)
-b-pyramid <int> E..V....... Keep some B-frames as references. (from -1 to INT_MAX) (default -1)
none 0 E..V.......
strict 1 E..V....... Strictly hierarchical pyramid
normal 2 E..V....... Non-strict (not Blu-ray compatible)
-mixed-refs <boolean> E..V....... One reference per partition, as opposed to one reference per macroblock (default auto)
-8x8dct <boolean> E..V....... High profile 8x8 transform. (default auto)
-fast-pskip <boolean> E..V....... (default auto)
-aud <boolean> E..V....... Use access unit delimiters. (default auto)
-mbtree <boolean> E..V....... Use macroblock tree ratecontrol. (default auto)
-deblock <string> E..V....... Loop filter parameters, in <alpha:beta> form.
-cplxblur <float> E..V....... Reduce fluctuations in QP (before curve compression) (from -1 to FLT_MAX) (default -1)
-partitions <string> E..V....... A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all
-direct-pred <int> E..V....... Direct MV prediction mode (from -1 to INT_MAX) (default -1)
none 0 E..V.......
spatial 1 E..V.......
temporal 2 E..V.......
auto 3 E..V.......
-slice-max-size <int> E..V....... Limit the size of each slice in bytes (from -1 to INT_MAX) (default -1)
-stats <string> E..V....... Filename for 2 pass stats
-nal-hrd <int> E..V....... Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) (from -1 to INT_MAX) (default -1)
none 0 E..V.......
vbr 1 E..V.......
cbr 2 E..V.......
-avcintra-class <int> E..V....... AVC-Intra class 50/100/200/300/480 (from -1 to 480) (default -1)
-me_method <int> E..V....... Set motion estimation method (from -1 to 4) (default -1)
dia 0 E..V.......
hex 1 E..V.......
umh 2 E..V.......
esa 3 E..V.......
tesa 4 E..V.......
-motion-est <int> E..V....... Set motion estimation method (from -1 to 4) (default -1)
dia 0 E..V.......
hex 1 E..V.......
umh 2 E..V.......
esa 3 E..V.......
tesa 4 E..V.......
-forced-idr <boolean> E..V....... If forcing keyframes, force them as IDR frames. (default false)
-coder <int> E..V....... Coder type (from -1 to 1) (default default)
default -1 E..V.......
cavlc 0 E..V.......
cabac 1 E..V.......
vlc 0 E..V.......
ac 1 E..V.......
-b_strategy <int> E..V....... Strategy to choose between I/P/B-frames (from -1 to 2) (default -1)
-chromaoffset <int> E..V....... QP difference between chroma and luma (from INT_MIN to INT_MAX) (default 0)
-sc_threshold <int> E..V....... Scene change threshold (from INT_MIN to INT_MAX) (default -1)
-noise_reduction <int> E..V....... Noise reduction (from INT_MIN to INT_MAX) (default -1)
-udu_sei <boolean> E..V....... Use user data unregistered SEI if available (default false)
-x264-params <dictionary> E..V....... Override the x264 configuration using a :-separated list of key=value parameters以如下一行为例：
-preset <string> E..V....... Set the encoding preset (cf. x264 --fullhelp) (default "medium")
含义如下：
参数名字为 -preset, 参数值类型为string，默认值为medium
但是没有更加详细的说明。提示给出：可以使用x264 --fullhelp查看。意思是，你要找一个可执行的x264（windows上是x264.exe），然后使用 x264 --fullhelp，查看更加相近的说明。
4.找到一个x264.exe,然后执行 x264 --fullhelp 命令
实际上 我们前面在windows 上 自己build ffmpeg的时候，就会有x264.exe build 出来。
如果忘记了，可以参考一下前面的博客。
有了x264.exe,cmd进入当前路径，执行 x264 --fullhelp
也可以使用 x264 --fullhelp > x264fullhelp.txt ，将h264参数都存储到 txt中
x264 core:164 r3161M a354f11
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 (lsmash)
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]
--mastering-display <string> Specify 'G(x,y)B(x,y)R(x,y)WP(x,y)L(max,min)'
for primaries, white point, and display brightness
--cll <string> Specify 'max_content,max_frame_average' content
light levels
--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, 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, x2rgb10le, x2rgb10be,
x2bgr10le, x2bgr10be, p210be, p210le, p410be,
p410le, p216be, p216le, p416be, p416le, vuya,
rgbaf16be, rgbaf16le, vuyx, p012le, p012be,
y212be, y212le, xv30be, xv30le, xv36be, xv36le,
rgbf32be, rgbf32le, rgbaf32be, rgbaf32le
--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, 300, 480
--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
5.x264常用的参数，以及说明
5.1 预设参数
–profile：设置H264视频的配置，设置成功会覆盖所有的参数设置。可选参数有：
baseline：无损，非隔行扫描，–no-8x8dct --bframes 0 --no-cabac --cqm flat --weightp 0；
基本画质。⽀持I/P 帧，只⽀持⽆交错（Progressive）和CAVLC；
main：–no-8x8dct --cqm flat，无损；
high：无损；
high10：支持8-10bit，无损；
high422：支持8-10bit，YUV420和YUV422；
high444：支持8-10bit，YUV420、YUV422和YUV444。
–present：压缩效率和运算时间中平衡的预设值。如果指定了一个预设值，它会在其它选项生效前生效。可选的值有：ultrafast、superfast、veryfast、faster、fast、medium、slow、slower、veryslow和placebo。
–tune：上一个选项基础上进一步优化输入。如果定义了一个tune值，它将在preset之后，其它选项之前生效。可选：film、animation、grain、stillimage、psnr、ssim、fastdecode、zerolatency和touhou。
–slow-firstpass：使用–pass 1会在解析命令行时增加一些设置。如果设置preset=placebo则自动关闭此特性。如果想显式关闭此特性，使用slow-firstpass。
5.2 帧类型选项
-I, --keyint<integer or "infinite">：设置GOPSize，默认值为250；
IDR帧是视频流的“分隔符”，所有帧都不可以使用越过关键帧的帧作为参考帧。
IDR帧是I帧的一种，所以它们也不参照其它帧。
这意味着它们可以作为视频的搜索（seek）点。
通过这个设置可以设置IDR帧的最大间隔帧数（亦称最大图像组长度）。
较大的值将导致IDR帧减少（会用占用空间更少的P帧和B帧取代），
也就同时减弱了参照帧选择的限制。
较小的值导致减少搜索一个随机帧所需的平均时间。-i, --min-keyint<integer> ：最小的GPOSize，默认为auto
--no-scenecut：完全关闭自适应I帧决策；
-- scenecut<integer> ：设置决策使用I帧、IDR帧的阈值（场景变换检测）；
x264会计算每一帧与前一帧的不同程度并得出一个值。
如果这个值低于scenecut，那么就算检测到一个“场景变换”。
如果此时距离上一帧的距离小于 min-keyint则插入一个I帧，反之则插入一个IDR帧。
较高的值会增加侦测到“场景变换”概率。--intra-refresh ：让x264为每keyint数量的帧使用宏块内部编码取代IDR帧；
块以水平移动列的方式更新，也叫刷新波。
对于低延迟的流，这样可以让帧的尺寸比使用标准的IDR帧更加保持恒定。
而且这样可以增强视频流对丢包的容错能力。
这个选项会降低压缩率，所以在确实需要的时候才选择它。-b, --bframes<integer> ：设置x264可使用的B帧的最大连续数量，默认3；
--b-adapt<integer> ：设置B帧决策算法，这个选项会影响到x264使用P帧或者B帧；
0：关闭。总是使用B帧。和以前的 no-b-adapt选项效果相同；
1：‘快速’算法。快速，–b-frames越大速度越快；
2：‘最佳’算法，慢速，–b-frames越大速度越慢；
--b-bias<integer> ：调节使用B帧的力度。越大的值越偏向B帧，可以在-100和100之间选择。100或-100不能保证完全或是全是B帧（使用 –b-adapt 0）；
–b-pyramid<string>：允许B帧作为参照帧。如果关闭，那么只有I帧和P帧才能作为参照帧。可以作为参照帧的B帧的量化参数会介于P帧和普通B帧之间。只在–b-frames设置大于等于2时此选项才生效。如果是在为蓝光光盘编码，请使用none或者strict。
none：不允许B帧作为参照帧；
strict：一个图像组内只允许一个B帧参照帧，这是蓝光编码强制要求的标准；
normal：任意使用B帧参照帧；
–open-gop：Open-GOP是一个提升压缩效率的编码技术，有些解码器不能完全支持open-GOP流，因此这个选项默认关闭；
none：关闭
normal：开启
bluray：开启。一个稍低效的open-GOP版本，因为normal模式不能用于蓝光编码。
open and closed gops all you need to know
–no-cabac：关闭CABAC (Context Adaptive Binary Arithmetic Coder)压缩，使用较为低效的CAVLC (Context Adaptive Variable Length Coder)。这两者在压缩效率和解码效率上有10%-20%的差别；
-r --ref<integer>：控制DPB (Decoded Picture Buffer)的大小。可以在0-16之间选择。简单地说，就是设置P帧可以选择它之前的多少帧作为参照帧（B帧的值要小1-2，取决于那个B帧能不能作为参照）。最小可以选择值1，只参照自己前面的那帧。注意H.264标准限制了每个level可以参照的帧的数量。如果选择level4.1，1080p最大选4，720p最大选9；
--no-deblock：完全关闭内置去块滤波器；
-f --deblock<alpha:beta>：调节H.264标准中的内置去块滤波器。这是个性价比很高的选择；
--slices<integer> ：设置每帧的分片数，强制使用矩形分片；
--slices-max <integer> ：每帧的绝对最大切片数,在必要时会覆盖lice-max-size/slice-max-mbs
--slice-max-size<integer> ：设置每个分块包括NAL头的最大大小（bytes）；
--slice-max-mbs<integer> ：设置每个分块包含的最大宏块数量；
--slice-min-mbs<integer> ：设置每个分块包含的最小宏块数量；
--tff：开启隔行编码并设置上半场在前。x264的隔行编码使用MBAFF，因此效率不如逐行扫描。所以，仅在需要在隔行显示的设备上显示时才开启这个选项；
--bff：开启隔行编码并设置下半场在前；
--constrained-intra：开启SVC编码的底层要求的强制帧内预测；
--pulldown<string> ：为你的输入流（逐行扫描的，固定帧率的）使用一组预设的“soft pulldown”；可选的参数有：none、22、32、64、double、triple、euro；
--fake-interlaced：把流标志为隔行的但不按隔行编码。用于编码25p和30p的蓝光兼容视频；
--frame-packing<integer>：对于立体视频，定义帧排列方式：
0：棋盘格 - 像素交替来自左眼和右眼
1：列交替 - 左眼和右眼通过列交替交织
2：行交替 - 左眼和右眼通过行交替交织
3：左右并排 - 左眼在左侧，右眼在右侧
4：上下并排 - 左眼在上方，右眼在下方
5：帧交替 - 每帧显示一个视图
6：单眼 - 2D帧，没有任何帧包装
7：平铺格式 - 左眼在左上方，右眼分割在其余区域
5.3 码率控制
-q, --qp<integer> ：强制使用恒定的QP值（0-81，0=无损）；
-B, --bitrate<integer> ：设置比特率（kbit/s）；
--crf<float> ：基于质量的可变比特率（-12-51）[23.0]；
--rc-lookahead<integer> ：预测帧类型的帧数 [40]；
--vbv-maxrate<integer> ：最大本地比特率（kbit/s）[0]；
--vbv-bufsize<integer> ：设置VBV缓冲区大小（kbit）[0]；
--vbv-init<float> ：初始VBV缓冲区占用率 [0.9]；
--crf-max<float> ：使用CRF+VBV时，限制RF到此值可能导致VBV下溢！；
--qpmin<integer>：设置最小QP值 [0]；
--qpmax<integer>：设置最大QP值 [81]；
--qpstep<integer>：设置最大QP步长 [4]；
--ratetol<float>：ABR速率控制和VBV的容差 [1.0]；
--ipratio<float>：I和P之间的QP因子 [1.40]；
--pbratio<float>：P和B之间的QP因子 [1.30]；
--chroma-qp-offset<integer> ：色度与亮度之间的QP差异 [0]；
--aq-mode<integer> ：AQ方法 [1]；
0: 禁用；
1: 方差AQ（复杂度掩码）；
2: 自动方差AQ；
3: 自动方差AQ，并偏向于暗场景；
–aq-strength<float>：减少平坦和纹理区域中的块和模糊 [1.0]；
-p, --pass<integer>：启用多通道速率控制；
1: 第一遍，创建统计文件；
2: 最后一遍，不覆盖统计文件；
3: 第N遍，覆盖统计文件；
--stats<string> ：用于两遍统计的文件名 [“x264_2pass.log”]；
--no-mbtree：禁用mb-tree速率控制；
--qcomp<float> ：QP曲线压缩 [0.60]；
--cplxblur<float> ：减少QP的波动（曲线压缩之前） [20.0]；
--qblur<float> ：减少QP的波动（曲线压缩之后） [0.5]；
--zones：调整视频区域的比特率；每个区域的格式为<起始帧数>，<结束帧数>，<选项>，其中<选项>可以是q=<整数>（强制QP）或 b=<浮点数>（比特率倍增器）；
--qpfile<string> ：强制一些或所有帧的帧类型和QP值；每行的格式：帧号 帧类型 QPQP是可选的（none表示由x264选择）。帧类型：I，i，K，P，B，b。K=<I或i>取决于open-gop设置QP受qpmin/qpmax的限制。
5.4 分析
-A，–partitions:要考虑的分区。可选值为[“p8x8, b8x8, i8x8, i4x4”]，表示考虑的分区类型，包括p8x8、p4x4、b8x8、i8x8、i4x4、none和all。
–direct:直接运动矢量（MV）预测模式。可选值为[“spatial”]，表示直接MV预测模式，包括none、spatial、temporal和auto。
–no-weightb:禁用B帧的加权预测。
–weightp:P帧的加权预测。可选值为[2]，表示加权预测的类型，包括0（禁用）、1（加权参考帧）和2（加权参考帧+复制帧）。
–me:整数像素运动估计方法。可选值为[“hex”]，表示整数像素运动估计方法，包括dia（钻石搜索，半径1，快速）、hex（六边形搜索，半径2）、umh（不均匀多六边形搜索）、esa（穷举搜索）和tesa（哈达玛穷举搜索，慢）。
–merange:最大运动矢量搜索范围，默认值为16。
–mvrange:最大运动矢量长度，默认值为-1（自动）。
–mvrange-thread:线程之间的最小缓冲区，默认值为-1（自动）。
-m, --subme:亚像素运动估计和模式决策。可选值为[7]，表示亚像素运动估计和模式决策的级别，包括0（仅全像素，不推荐使用）、1（SAD模式决策，一次qpel迭代）、2（SATD模式决策）等。
–psy-rd:心理视觉优化的强度，默认值为"1.0:0.0"。其中，#1表示RD（需要subme>=6），#2表示Trellis（需要trellis，实验性）。
–no-psy:禁用所有恶化PSNR和SSIM的视觉优化。
–no-mixed-refs:不基于每个分区来决定引用帧。
–no-chroma-me:忽略运动估计中的色度。
–no-8x8dct:禁用自适应空间变换大小。
-t, --trellis:Trellis RD量化，默认值为1。可选值为0（禁用）、1（仅在MB的最终编码中启用）、2（在所有模式决策中启用）。
–no-fast-pskip:在P帧上禁用早期SKIP检测。
–no-dct-decimate:在P帧上禁用系数阈值。
–nr:降噪，默认值为0。
–deadzone-inter:设置互帧亮度量化deadzone的大小，默认值为21。
–deadzone-intra:设置帧内亮度量化deadzone的大小，默认值为11。deadzone的大小应在0到32之间。
–cqm:预设量化矩阵。可选值为[“flat”]，表示预设的量化矩阵类型，包括flat和jvt。
–cqmfile:从与JM兼容的文件中读取自定义的量化矩阵。会覆盖其他–cqm*选项。
–cqm4:设置所有的4x4量化矩阵。需要提供一个由16个整数组成的逗号分隔列表。
–cqm8:设置所有的8x8量化矩阵。需要提供一个由64个整数组成的逗号分隔列表。
–cqm4i, --cqm4p, --cqm8i, --cqm8p:同时设置亮度和色度的量化矩阵。
–cqm4iy, --cqm4ic, --cqm4py, --cqm4pc:设置单独的亮度和色度量化矩阵。
5.5 设置视频可用性信息
VUI设置不被编码器使用，只是对播放设备的建议。
–overscan：指定裁剪超扫描设置。可选值为[“undef”]，表示裁剪超扫描的设置，包括undef、show和crop。
–videoformat：指定视频格式。可选值为[“undef”]，表示视频格式，包括component、pal、ntsc、secam、mac和undef。
–range：指定颜色范围。可选值为[“auto”]，表示颜色范围，包括auto、tv和pc。
–colorprim：指定颜色原色。可选值为[“undef”]，表示颜色原色，包括undef、bt709、bt470m、bt470bg、smpte170m、smpte240m、film、bt2020、smpte428、smpte431和smpte432。
–transfer：指定传输特性。可选值为[“undef”]，表示传输特性，包括undef、bt709、bt470m、bt470bg、smpte170m、smpte240m、linear、log100、log316、iec61966-2-4、bt1361e、iec61966-2-1、bt2020-10、bt2020-12、smpte2084、smpte428和arib-std-b67。
–colormatrix：指定颜色矩阵设置。可选值为[“???”]，表示颜色矩阵设置，包括undef、bt709、fcc、bt470bg、smpte170m、smpte240m、GBR、YCgCo、bt2020nc、bt2020c、smpte2085、chroma-derived-nc、chroma-derived-c和ICtCp。
–chromaloc：指定色度采样位置（0到5）。默认值为0。
**–mastering-display ：指定主显示器的亮度、白点和显示亮度。格式为’G(x,y)B(x,y)R(x,y)WP(x,y)L(max,min)'。
–cll：指定内容光亮度的最大值和最大帧平均值。格式为’max_content,max_frame_average’。
–alternative-transfer：指定备用传输特性。可选值与–transfer相同。
–nal-hrd：信号HRD信息（需要vbv-bufsize）。可选值为none、vbr、cbr（.mp4中不允许使用cbr）。
–filler：强制使用硬CBR并生成填充数据（隐含–nal-hrd cbr）。
–pic-struct：强制在图像定时SEI中使用pic_struct。
–crop-rect：将’left,top,right,bottom’添加到比特流级别的裁剪矩形。
