FFMPEG进阶系列02-ffmpeg命令详解2
帮助信息
查看ffmpeg版本
通过ffmpeg -version查看ffmpeg的版本，这里所查看的版本，是详细的版本，包含libavformat、libavcodec、libavutil、libavfilter、libswscale、libswresample的版本，如图： ffmpeg.exe -version
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.1 (GCC) 20180722
configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fon
tconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsna
ppy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidsta
b --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --ena
ble-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2
--enable-avisynth
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100查看formats
有时候使用ffmpeg转码，发现无法解析视频文件，或者无法生成视频文件，报一些不支持生成对应的视频文件的错误，这个时候就需要查看当前使用的ffmpeg是否支对应的视频文件格式，需要使用ffmpeg -formats来查看：
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.1 (GCC) 20180722
configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-f
ontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --e
nable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libs
nappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --ena
ble-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvids
tab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --e
nable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva
2 --enable-avisynth
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
File formats:
D. = Demuxing supported
.E = Muxing supported
--
D 3dostr 3DO STR
E 3g2 3GP2 (3GPP2 file format)
E 3gp 3GP (3GPP file format)
D 4xm 4X Technologies
E a64 a64 - video for Commodore 64
D aa Audible AA format files
D aac raw ADTS AAC (Advanced Audio Coding)
DE ac3 raw AC-3
D acm Interplay ACM
D act ACT Voice file format
D adf Artworx Data Format
D adp ADP
D ads Sony PS2 ADS
E adts ADTS AAC (Advanced Audio Coding)
DE adx CRI ADX
D aea MD STUDIO audio
D afc AFC
DE aiff Audio IFF
D aix CRI AIX
DE alaw PCM A-law
D alias_pix Alias/Wavefront PIX image
DE amr 3GPP AMR
D amrnb raw AMR-NB
D amrwb raw AMR-WB
D anm Deluxe Paint Animation
D apc CRYO APC
D ape Monkey's Audio
DE apng Animated Portable Network Graphics
DE aptx raw aptX (Audio Processing Technology for Bluetooth)
DE aptx_hd raw aptX HD (Audio Processing Technology for Bluetooth)
D aqtitle AQTitle subtitles
DE asf ASF (Advanced / Active Streaming Format)
D asf_o ASF (Advanced / Active Streaming Format)
E asf_stream ASF (Advanced / Active Streaming Format)
DE ass SSA (SubStation Alpha) subtitle
DE ast AST (Audio Stream)
DE au Sun AU
DE avi AVI (Audio Video Interleaved)
D avisynth AviSynth script
E avm2 SWF (ShockWave Flash) (AVM2)
D avr AVR (Audio Visual Research)
D avs AVS
D bethsoftvid Bethesda Softworks VID
D bfi Brute Force & Ignorance
D bfstm BFSTM (Binary Cafe Stream)
D bin Binary text
D bink Bink
DE bit G.729 BIT file format
D bmp_pipe piped bmp sequence
D bmv Discworld II BMV
D boa Black Ops Audio
D brender_pix BRender PIX image
D brstm BRSTM (Binary Revolution Stream)
D c93 Interplay C93
DE caf Apple CAF (Core Audio Format)
DE cavsvideo raw Chinese AVS (Audio Video Standard) video
D cdg CD Graphics
D cdxl Commodore CDXL video
D cine Phantom Cine
DE codec2 codec2 .c2 muxer
DE codec2raw raw codec2 muxer
D concat Virtual concatenation script
E crc CRC testing
DE dash DASH Muxer
DE data raw data
DE daud D-Cinema audio
D dcstr Sega DC STR
D dds_pipe piped dds sequence
D dfa Chronomaster DFA
DE dirac raw Dirac
DE dnxhd raw DNxHD (SMPTE VC-3)
D dpx_pipe piped dpx sequence
D dsf DSD Stream File (DSF)
D dshow DirectShow capture
D dsicin Delphine Software International CIN
D dss Digital Speech Standard (DSS)
DE dts raw DTS
D dtshd raw DTS-HD
DE dv DV (Digital Video)
D dvbsub raw dvbsub
D dvbtxt dvbtxt
E dvd MPEG-2 PS (DVD VOB)
D dxa DXA
D ea Electronic Arts Multimedia
D ea_cdata Electronic Arts cdata
DE eac3 raw E-AC-3
D epaf Ensoniq Paris Audio File
D exr_pipe piped exr sequence
DE f32be PCM 32-bit floating-point big-endian
DE f32le PCM 32-bit floating-point little-endian
E f4v F4V Adobe Flash Video
DE f64be PCM 64-bit floating-point big-endian
DE f64le PCM 64-bit floating-point little-endian
DE ffmetadata FFmpeg metadata in text
E fifo FIFO queue pseudo-muxer
E fifo_test Fifo test muxer
DE film_cpk Sega FILM / CPK
DE filmstrip Adobe Filmstrip
DE fits Flexible Image Transport System
DE flac raw FLAC
D flic FLI/FLC/FLX animation
DE flv FLV (Flash Video)
E framecrc framecrc testing
E framehash Per-frame hash testing
E framemd5 Per-frame MD5 testing
D frm Megalux Frame
D fsb FMOD Sample Bank
DE g722 raw G.722
DE g723_1 raw G.723.1
DE g726 raw big-endian G.726 ("left-justified")
DE g726le raw little-endian G.726 ("right-justified")
D g729 G.729 raw format demuxer
D gdigrab GDI API Windows frame grabber
D gdv Gremlin Digital Video
D genh GENeric Header
DE gif GIF Animation
DE gsm raw GSM
DE gxf GXF (General eXchange Format)
DE h261 raw H.261
DE h263 raw H.263
DE h264 raw H.264 video
E hash Hash testing
E hds HDS Muxer
DE hevc raw HEVC video
E hls Apple HTTP Live Streaming
D hls,applehttp Apple HTTP Live Streaming
D hnm Cryo HNM v4
DE ico Microsoft Windows ICO
D idcin id Cinematic
D idf iCE Draw File
D iff IFF (Interchange File Format)
DE ilbc iLBC storage
DE image2 image2 sequence
DE image2pipe piped image2 sequence
D ingenient raw Ingenient MJPEG
D ipmovie Interplay MVE
E ipod iPod H.264 MP4 (MPEG-4 Part 14)
DE ircam Berkeley/IRCAM/CARL Sound Format
E ismv ISMV/ISMA (Smooth Streaming)
D iss Funcom ISS
D iv8 IndigoVision 8000 video
DE ivf On2 IVF
D ivr IVR (Internet Video Recording)
D j2k_pipe piped j2k sequence
DE jacosub JACOsub subtitle format
D jpeg_pipe piped jpeg sequence
D jpegls_pipe piped jpegls sequence
D jv Bitmap Brothers JV
E latm LOAS/LATM
D lavfi Libavfilter virtual input device
D live_flv live RTMP FLV (Flash Video)
D lmlm4 raw lmlm4
D loas LOAS AudioSyncStream
DE lrc LRC lyrics
D lvf LVF
D lxf VR native stream (LXF)
DE m4v raw MPEG-4 video
E matroska Matroska
D matroska,webm Matroska / WebM
E md5 MD5 testing
D mgsts Metal Gear Solid: The Twin Snakes
DE microdvd MicroDVD subtitle format
DE mjpeg raw MJPEG video
D mjpeg_2000 raw MJPEG 2000 video
E mkvtimestamp_v2 extract pts as timecode v2 format, as defined by mkvtoolnix
DE mlp raw MLP
D mlv Magic Lantern Video (MLV)
D mm American Laser Games MM
DE mmf Yamaha SMAF
E mov QuickTime / MOV
D mov,mp4,m4a,3gp,3g2,mj2 QuickTime / MOV
E mp2 MP2 (MPEG audio layer 2)
DE mp3 MP3 (MPEG audio layer 3)
E mp4 MP4 (MPEG-4 Part 14)
D mpc Musepack
D mpc8 Musepack SV8
DE mpeg MPEG-1 Systems / MPEG program stream
E mpeg1video raw MPEG-1 video
E mpeg2video raw MPEG-2 video
DE mpegts MPEG-TS (MPEG-2 Transport Stream)
D mpegtsraw raw MPEG-TS (MPEG-2 Transport Stream)
D mpegvideo raw MPEG video
DE mpjpeg MIME multipart JPEG
D mpl2 MPL2 subtitles
D mpsub MPlayer subtitles
D msf Sony PS3 MSF
D msnwctcp MSN TCP Webcam stream
D mtaf Konami PS2 MTAF
D mtv MTV
DE mulaw PCM mu-law
D musx Eurocom MUSX
D mv Silicon Graphics Movie
D mvi Motion Pixels MVI
DE mxf MXF (Material eXchange Format)
E mxf_d10 MXF (Material eXchange Format) D-10 Mapping
E mxf_opatom MXF (Material eXchange Format) Operational Pattern Atom
D mxg MxPEG clip
D nc NC camera feed
D nistsphere NIST SPeech HEader REsources
D nsp Computerized Speech Lab NSP
D nsv Nullsoft Streaming Video
E null raw null video
DE nut NUT
D nuv NuppelVideo
E oga Ogg Audio
DE ogg Ogg
E ogv Ogg Video
DE oma Sony OpenMG audio
E opus Ogg Opus
D paf Amazing Studio Packed Animation File
D pam_pipe piped pam sequence
D pbm_pipe piped pbm sequence
D pcx_pipe piped pcx sequence
D pgm_pipe piped pgm sequence
D pgmyuv_pipe piped pgmyuv sequence
D pictor_pipe piped pictor sequence
D pjs PJS (Phoenix Japanimation Society) subtitles
D pmp Playstation Portable PMP
D png_pipe piped png sequence
D ppm_pipe piped ppm sequence
D psd_pipe piped psd sequence
E psp PSP MP4 (MPEG-4 Part 14)
D psxstr Sony Playstation STR
D pva TechnoTrend PVA
D pvf PVF (Portable Voice Format)
D qcp QCP
D qdraw_pipe piped qdraw sequence
D r3d REDCODE R3D
DE rawvideo raw video
D realtext RealText subtitle format
D redspark RedSpark
D rl2 RL2
DE rm RealMedia
DE roq raw id RoQ
D rpl RPL / ARMovie
D rsd GameCube RSD
DE rso Lego Mindstorms RSO
DE rtp RTP output
E rtp_mpegts RTP/mpegts output format
DE rtsp RTSP output
DE s16be PCM signed 16-bit big-endian
DE s16le PCM signed 16-bit little-endian
DE s24be PCM signed 24-bit big-endian
DE s24le PCM signed 24-bit little-endian
DE s32be PCM signed 32-bit big-endian
DE s32le PCM signed 32-bit little-endian
D s337m SMPTE 337M
DE s8 PCM signed 8-bit
D sami SAMI subtitle format
DE sap SAP output
DE sbc raw SBC
D sbg SBaGen binaural beats script
DE scc Scenarist Closed Captions
E sdl,sdl2 SDL2 output device
D sdp SDP
D sdr2 SDR2
D sds MIDI Sample Dump Standard
D sdx Sample Dump eXchange
E segment segment
D sgi_pipe piped sgi sequence
D shn raw Shorten
D siff Beam Software SIFF
E singlejpeg JPEG single image
D sln Asterisk raw pcm
DE smjpeg Loki SDL MJPEG
D smk Smacker
E smoothstreaming Smooth Streaming Muxer
D smush LucasArts Smush
D sol Sierra SOL
DE sox SoX native
DE spdif IEC 61937 (used on S/PDIF - IEC958)
E spx Ogg Speex
DE srt SubRip subtitle
D stl Spruce subtitle format
E stream_segment,ssegment streaming segment muxer
D subviewer SubViewer subtitle format
D subviewer1 SubViewer v1 subtitle format
D sunrast_pipe piped sunrast sequence
DE sup raw HDMV Presentation Graphic Stream subtitles
D svag Konami PS2 SVAG
E svcd MPEG-2 PS (SVCD)
D svg_pipe piped svg sequence
DE swf SWF (ShockWave Flash)
D tak raw TAK
D tedcaptions TED Talks captions
E tee Multiple muxer tee
D thp THP
D tiertexseq Tiertex Limited SEQ
D tiff_pipe piped tiff sequence
D tmv 8088flex TMV
DE truehd raw TrueHD
DE tta TTA (True Audio)
D tty Tele-typewriter
D txd Renderware TeXture Dictionary
D ty TiVo TY Stream
DE u16be PCM unsigned 16-bit big-endian
DE u16le PCM unsigned 16-bit little-endian
DE u24be PCM unsigned 24-bit big-endian
DE u24le PCM unsigned 24-bit little-endian
DE u32be PCM unsigned 32-bit big-endian
DE u32le PCM unsigned 32-bit little-endian
DE u8 PCM unsigned 8-bit
E uncodedframecrc uncoded framecrc testing
D v210 Uncompressed 4:2:2 10-bit
D v210x Uncompressed 4:2:2 10-bit
D vag Sony PS2 VAG
DE vc1 raw VC-1 video
DE vc1test VC-1 test bitstream
E vcd MPEG-1 Systems / MPEG program stream (VCD)
D vfwcap VfW video capture
D vivo Vivo
D vmd Sierra VMD
E vob MPEG-2 PS (VOB)
D vobsub VobSub subtitle format
DE voc Creative Voice
D vpk Sony PS2 VPK
D vplayer VPlayer subtitles
D vqf Nippon Telegraph and Telephone Corporation (NTT) TwinVQ
DE w64 Sony Wave64
DE wav WAV / WAVE (Waveform Audio)
D wc3movie Wing Commander III movie
E webm WebM
E webm_chunk WebM Chunk Muxer
DE webm_dash_manifest WebM DASH Manifest
E webp WebP
D webp_pipe piped webp sequence
DE webvtt WebVTT subtitle
D wsaud Westwood Studios audio
D wsd Wideband Single-bit Data (WSD)
D wsvqa Westwood Studios VQA
DE wtv Windows Television (WTV)
DE wv raw WavPack
D wve Psion 3 audio
D xa Maxis XA
D xbin eXtended BINary text (XBIN)
D xmv Microsoft XMV
D xpm_pipe piped xpm sequence
D xvag Sony PS3 XVAG
D xwma Microsoft xWMA
D yop Psygnosis YOP
DE yuv4mpegpipe YUV4MPEG pipe根据上图可以看到，在输出的内容中，分为三部分：
-
第一列是多媒体文件格式的Demuxing支持与Muxing支持；
-
第二列是多媒体文件格式；
-
第三列是文件格式的详细说明。
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其他大类的查看
| 帮助参数 | 说明 |
|---|---|
| -buildconf | show build configuration 显示编译配置 |
| -formats | show available formats 可用的格式 |
| -muxers | show available muxers 可用的复用器 |
| -demuxers | show available demuxers可用的解复用器 |
| -devices | show available devices 可用的设备列表 |
| -codecs | show available codecs 可用的编解码器 |
| -decoders | show available decoders 可用的解码器 |
| -encoders | show available encoders可用的解码器 |
| -bsfs | show available bit stream filters 可用的bit流过滤器 |
| -protocols | show available protocols 可用的协议 |
| -filters | show available filters 可用的过滤器 |
| -pix_fmts | show available pixel formats 可用的像素格式 |
| -layouts | show standard channel layouts 可用的声道布局 |
| -sample_fmts | show available audio sample formats 可用的音频采样格式 |
| -colors | show available color names 可用的颜色名字 |
| -sources device | list sources of the input device 列出输入设备的sources |
| -sinks device | list sinks of the output device 列出输出设备的sinks |
| -hwaccels | show available HW acceleration methods 可用的硬件加速方法 |
查看具体demuxer/muxer/decoder/encoder/filter所支持的参数
举例
查看FLV封装器的参数支持
命令：ffmpeg -h muxer=flv
Muxer flv [FLV (Flash Video)]:
Common extensions: flv.
Mime type: video/x-flv.
Default video codec: flv1.
Default audio codec: mp3.
flv muxer AVOptions:
-flvflags E........ FLV muxer flags (default 0)
aac_seq_header_detect E........ Put AAC sequence header based on stream data
no_sequence_end E........ disable sequence end for FLV
no_metadata E........ disable metadata for FLV
no_duration_filesize E........ disable duration and filesize zero value metadata for FLV
add_keyframe_index E........ Add keyframe index metadata 从输出的帮助信息可以看到，FLV的muxer的信息包含两大部分：
-
第一部分为FLV封装的默认配置描述，如扩展名，MIME类型，默认的视频编码格式，默认的音频编码格式。
-
第二部分为FLV封装时可以支持的配置参数及相关说明。
查看flv解封装器的参数支持
命令：ffmpeg -h demuxer=flv
Demuxer flv [FLV (Flash Video)]:
Common extensions: flv.
flvdec AVOptions:
-flv_metadata .D.V..... Allocate streams according to the onMetaData array (default false)
-missing_streams .D.V..XR. (from 0 to 255) (default 0) 从输出的帮助信息可以看到，FLV的demuxer的信息包含两大部分：
-
第一部分为FLV解封装默认的扩展名。
-
第二部分为FLV解封装时可以支持的配置参数及相关说明。
查看H264（AVC）的编码参数支持
命令：
-
ffmpeg -h encoder=h264 显示所有的h264编码器
-
ffmpeg -h encoder=libx264 只显示libx264 这里只显示libx264
Encoder libx264 [libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10]:
General capabilities: delay threads
Threading capabilities: auto
Supported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16 nv21 yuv420p10le yuv422p10le y
uv444p10le nv20le
libx264 AVOptions:
-preset E..V..... Set the encoding preset (cf. x264 --fullhelp) (default "medium")
-tune E..V..... Tune the encoding params (cf. x264 --fullhelp)
-profile E..V..... Set profile restrictions (cf. x264 --fullhelp)
-fastfirstpass E..V..... Use fast settings when encoding first pass (default true)
-level E..V..... Specify level (as defined by Annex A)
-passlogfile E..V..... Filename for 2 pass stats
-wpredp E..V..... Weighted prediction for P-frames
-a53cc E..V..... Use A53 Closed Captions (if available) (default true)
-x264opts E..V..... x264 options
-crf E..V..... Select the quality for constant quality mode (from -1 to FLT_MAX) (default -
1)
-crf_max E..V..... In CRF mode, prevents VBV from lowering quality beyond this point. (from -1
to FLT_MAX) (default -1)
-qp E..V..... Constant quantization parameter rate control method (from -1 to INT_MAX) (de
fault -1)
-aq-mode E..V..... AQ method (from -1 to INT_MAX) (default -1)
none E..V.....
variance E..V..... Variance AQ (complexity mask)
autovariance E..V..... Auto-variance AQ
autovariance-biased E..V..... Auto-variance AQ with bias to dark scenes
-aq-strength E..V..... AQ strength. Reduces blocking and blurring in flat and textured areas. (from
-1 to FLT_MAX) (default -1)
-psy E..V..... Use psychovisual optimizations. (default auto)
-psy-rd E..V..... Strength of psychovisual optimization, in : format.
-rc-lookahead E..V..... Number of frames to look ahead for frametype and ratecontrol (from -1 to INT
_MAX) (default -1)
-weightb E..V..... Weighted prediction for B-frames. (default auto)
-weightp E..V..... Weighted prediction analysis method. (from -1 to INT_MAX) (default -1)
none E..V.....
simple E..V.....
smart E..V.....
-ssim E..V..... Calculate and print SSIM stats. (default auto)
-intra-refresh E..V..... Use Periodic Intra Refresh instead of IDR frames. (default auto)
-bluray-compat E..V..... Bluray compatibility workarounds. (default auto)
-b-bias E..V..... Influences how often B-frames are used (from INT_MIN to INT_MAX) (default IN
T_MIN)
-b-pyramid E..V..... Keep some B-frames as references. (from -1 to INT_MAX) (default -1)
none E..V.....
strict E..V..... Strictly hierarchical pyramid
normal E..V..... Non-strict (not Blu-ray compatible)
-mixed-refs E..V..... One reference per partition, as opposed to one reference per macroblock (def
ault auto)
-8x8dct E..V..... High profile 8x8 transform. (default auto)
-fast-pskip E..V..... (default auto)
-aud E..V..... Use access unit delimiters. (default auto)
-mbtree E..V..... Use macroblock tree ratecontrol. (default auto)
-deblock E..V..... Loop filter parameters, in form.
-cplxblur E..V..... Reduce fluctuations in QP (before curve compression) (from -1 to FLT_MAX) (d
efault -1)
-partitions E..V..... A comma-separated list of partitions to consider. Possible values: p8x8, p4x
4, b8x8, i8x8, i4x4, none, all
-direct-pred E..V..... Direct MV prediction mode (from -1 to INT_MAX) (default -1)
none E..V.....
spatial E..V.....
temporal E..V.....
auto E..V.....
-slice-max-size E..V..... Limit the size of each slice in bytes (from -1 to INT_MAX) (default -1)
-stats E..V..... Filename for 2 pass stats
-nal-hrd E..V..... Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) (from
-1 to INT_MAX) (default -1)
none E..V.....
vbr E..V.....
cbr E..V.....
-avcintra-class E..V..... AVC-Intra class 50/100/200 (from -1 to 200) (default -1)
-me_method E..V..... Set motion estimation method (from -1 to 4) (default -1)
dia E..V.....
hex E..V.....
umh E..V.....
esa E..V.....
tesa E..V.....
-motion-est E..V..... Set motion estimation method (from -1 to 4) (default -1)
dia E..V.....
hex E..V.....
umh E..V.....
esa E..V.....
tesa E..V.....
-forced-idr E..V..... If forcing keyframes, force them as IDR frames. (default false)
-coder E..V..... Coder type (from -1 to 1) (default default)
default E..V.....
cavlc E..V.....
cabac E..V.....
vlc E..V.....
ac E..V.....
-b_strategy E..V..... Strategy to choose between I/P/B-frames (from -1 to 2) (default -1)
-chromaoffset E..V..... QP difference between chroma and luma (from INT_MIN to INT_MAX) (default -1)
-sc_threshold E..V..... Scene change threshold (from INT_MIN to INT_MAX) (default -1)
-noise_reduction E..V..... Noise reduction (from INT_MIN to INT_MAX) (default -1)
-x264-params E..V..... Override the x264 configuration using a :-separated list of key=value parame
ters 更多的x264参数 见 cf. x264 --fullhelp x264 参数详解
查看音频支持的PCM格式以及声道布局
1.ffmpeg.exe -sample_fmts
name depth
u8 8
s16 16
s32 32
flt 32
dbl 64
u8p 8
s16p 16
s32p 32
fltp 32
dblp 64
s64 64
s64p 642.ffmpeg.exe -layouts
Individual channels:
NAME DESCRIPTION
FL front left
FR front right
FC front center
LFE low frequency
BL back left
BR back right
FLC front left-of-center
FRC front right-of-center
BC back center
SL side left
SR side right
TC top center
TFL top front left
TFC top front center
TFR top front right
TBL top back left
TBC top back center
TBR top back right
DL downmix left
DR downmix right
WL wide left
WR wide right
SDL surround direct left
SDR surround direct right
LFE2 low frequency 2
Standard channel layouts:
NAME DECOMPOSITION
mono FC
stereo FL+FR
2.1 FL+FR+LFE
3.0 FL+FR+FC
3.0(back) FL+FR+BC
4.0 FL+FR+FC+BC
quad FL+FR+BL+BR
quad(side) FL+FR+SL+SR
3.1 FL+FR+FC+LFE
5.0 FL+FR+FC+BL+BR
5.0(side) FL+FR+FC+SL+SR
4.1 FL+FR+FC+LFE+BC
5.1 FL+FR+FC+LFE+BL+BR
5.1(side) FL+FR+FC+LFE+SL+SR
6.0 FL+FR+FC+BC+SL+SR
6.0(front) FL+FR+FLC+FRC+SL+SR
hexagonal FL+FR+FC+BL+BR+BC
6.1 FL+FR+FC+LFE+BC+SL+SR
6.1(back) FL+FR+FC+LFE+BL+BR+BC
6.1(front) FL+FR+LFE+FLC+FRC+SL+SR
7.0 FL+FR+FC+BL+BR+SL+SR
7.0(front) FL+FR+FC+FLC+FRC+SL+SR
7.1 FL+FR+FC+LFE+BL+BR+SL+SR
7.1(wide) FL+FR+FC+LFE+BL+BR+FLC+FRC
7.1(wide-side) FL+FR+FC+LFE+FLC+FRC+SL+SR
octagonal FL+FR+FC+BL+BR+BC+SL+SR
hexadecagonal FL+FR+FC+BL+BR+BC+SL+SR+TFL+TFC+TFR+TBL+TBC+TBR+WL+WR
downmix DL+DR