FFMPEG进阶系列02-ffmpeg命令详解2
2024-06-11 03:06:20
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 developersbuilt with gcc 7.3.1 (GCC) 20180722configuration: --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-avisynthlibavutil 56. 14.100 / 56. 14.100libavcodec 58. 18.100 / 58. 18.100libavformat 58. 12.100 / 58. 12.100libavdevice 58. 3.100 / 58. 3.100libavfilter 7. 16.100 / 7. 16.100libswscale 5. 1.100 / 5. 1.100libswresample 3. 1.100 / 3. 1.100libpostproc 55. 1.100 / 55. 1.100
File formats:D. = Demuxing supported.E = Muxing supported--D 3dostr 3DO STRE 3g2 3GP2 (3GPP2 file format)E 3gp 3GP (3GPP file format)D 4xm 4X TechnologiesE a64 a64 - video for Commodore 64D aa Audible AA format filesD aac raw ADTS AAC (Advanced Audio Coding)DE ac3 raw AC-3D acm Interplay ACMD act ACT Voice file formatD adf Artworx Data FormatD adp ADPD ads Sony PS2 ADSE adts ADTS AAC (Advanced Audio Coding)DE adx CRI ADXD aea MD STUDIO audioD afc AFCDE aiff Audio IFFD aix CRI AIXDE alaw PCM A-lawD alias_pix Alias/Wavefront PIX imageDE amr 3GPP AMRD amrnb raw AMR-NBD amrwb raw AMR-WBD anm Deluxe Paint AnimationD apc CRYO APCD ape Monkey's AudioDE apng Animated Portable Network GraphicsDE aptx raw aptX (Audio Processing Technology for Bluetooth)DE aptx_hd raw aptX HD (Audio Processing Technology for Bluetooth)D aqtitle AQTitle subtitlesDE 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) subtitleDE ast AST (Audio Stream)DE au Sun AUDE avi AVI (Audio Video Interleaved)D avisynth AviSynth scriptE avm2 SWF (ShockWave Flash) (AVM2)D avr AVR (Audio Visual Research)D avs AVSD bethsoftvid Bethesda Softworks VIDD bfi Brute Force & IgnoranceD bfstm BFSTM (Binary Cafe Stream)D bin Binary textD bink BinkDE bit G.729 BIT file formatD bmp_pipe piped bmp sequenceD bmv Discworld II BMVD boa Black Ops AudioD brender_pix BRender PIX imageD brstm BRSTM (Binary Revolution Stream)D c93 Interplay C93DE caf Apple CAF (Core Audio Format)DE cavsvideo raw Chinese AVS (Audio Video Standard) videoD cdg CD GraphicsD cdxl Commodore CDXL videoD cine Phantom CineDE codec2 codec2 .c2 muxerDE codec2raw raw codec2 muxerD concat Virtual concatenation scriptE crc CRC testingDE dash DASH MuxerDE data raw dataDE daud D-Cinema audioD dcstr Sega DC STRD dds_pipe piped dds sequenceD dfa Chronomaster DFADE dirac raw DiracDE dnxhd raw DNxHD (SMPTE VC-3)D dpx_pipe piped dpx sequenceD dsf DSD Stream File (DSF)D dshow DirectShow captureD dsicin Delphine Software International CIND dss Digital Speech Standard (DSS)DE dts raw DTSD dtshd raw DTS-HDDE dv DV (Digital Video)D dvbsub raw dvbsubD dvbtxt dvbtxtE dvd MPEG-2 PS (DVD VOB)D dxa DXAD ea Electronic Arts MultimediaD ea_cdata Electronic Arts cdataDE eac3 raw E-AC-3D epaf Ensoniq Paris Audio FileD exr_pipe piped exr sequenceDE f32be PCM 32-bit floating-point big-endianDE f32le PCM 32-bit floating-point little-endianE f4v F4V Adobe Flash VideoDE f64be PCM 64-bit floating-point big-endianDE f64le PCM 64-bit floating-point little-endianDE ffmetadata FFmpeg metadata in textE fifo FIFO queue pseudo-muxerE fifo_test Fifo test muxerDE film_cpk Sega FILM / CPKDE filmstrip Adobe FilmstripDE fits Flexible Image Transport SystemDE flac raw FLACD flic FLI/FLC/FLX animationDE flv FLV (Flash Video)E framecrc framecrc testingE framehash Per-frame hash testingE framemd5 Per-frame MD5 testingD frm Megalux FrameD fsb FMOD Sample BankDE g722 raw G.722DE g723_1 raw G.723.1DE g726 raw big-endian G.726 ("left-justified")DE g726le raw little-endian G.726 ("right-justified")D g729 G.729 raw format demuxerD gdigrab GDI API Windows frame grabberD gdv Gremlin Digital VideoD genh GENeric HeaderDE gif GIF AnimationDE gsm raw GSMDE gxf GXF (General eXchange Format)DE h261 raw H.261DE h263 raw H.263DE h264 raw H.264 videoE hash Hash testingE hds HDS MuxerDE hevc raw HEVC videoE hls Apple HTTP Live StreamingD hls,applehttp Apple HTTP Live StreamingD hnm Cryo HNM v4DE ico Microsoft Windows ICOD idcin id CinematicD idf iCE Draw FileD iff IFF (Interchange File Format)DE ilbc iLBC storageDE image2 image2 sequenceDE image2pipe piped image2 sequenceD ingenient raw Ingenient MJPEGD ipmovie Interplay MVEE ipod iPod H.264 MP4 (MPEG-4 Part 14)DE ircam Berkeley/IRCAM/CARL Sound FormatE ismv ISMV/ISMA (Smooth Streaming)D iss Funcom ISSD iv8 IndigoVision 8000 videoDE ivf On2 IVFD ivr IVR (Internet Video Recording)D j2k_pipe piped j2k sequenceDE jacosub JACOsub subtitle formatD jpeg_pipe piped jpeg sequenceD jpegls_pipe piped jpegls sequenceD jv Bitmap Brothers JVE latm LOAS/LATMD lavfi Libavfilter virtual input deviceD live_flv live RTMP FLV (Flash Video)D lmlm4 raw lmlm4D loas LOAS AudioSyncStreamDE lrc LRC lyricsD lvf LVFD lxf VR native stream (LXF)DE m4v raw MPEG-4 videoE matroska MatroskaD matroska,webm Matroska / WebME md5 MD5 testingD mgsts Metal Gear Solid: The Twin SnakesDE microdvd MicroDVD subtitle formatDE mjpeg raw MJPEG videoD mjpeg_2000 raw MJPEG 2000 videoE mkvtimestamp_v2 extract pts as timecode v2 format, as defined by mkvtoolnixDE mlp raw MLPD mlv Magic Lantern Video (MLV)D mm American Laser Games MMDE mmf Yamaha SMAFE mov QuickTime / MOVD mov,mp4,m4a,3gp,3g2,mj2 QuickTime / MOVE mp2 MP2 (MPEG audio layer 2)DE mp3 MP3 (MPEG audio layer 3)E mp4 MP4 (MPEG-4 Part 14)D mpc MusepackD mpc8 Musepack SV8DE mpeg MPEG-1 Systems / MPEG program streamE mpeg1video raw MPEG-1 videoE mpeg2video raw MPEG-2 videoDE mpegts MPEG-TS (MPEG-2 Transport Stream)D mpegtsraw raw MPEG-TS (MPEG-2 Transport Stream)D mpegvideo raw MPEG videoDE mpjpeg MIME multipart JPEGD mpl2 MPL2 subtitlesD mpsub MPlayer subtitlesD msf Sony PS3 MSFD msnwctcp MSN TCP Webcam streamD mtaf Konami PS2 MTAFD mtv MTVDE mulaw PCM mu-lawD musx Eurocom MUSXD mv Silicon Graphics MovieD mvi Motion Pixels MVIDE mxf MXF (Material eXchange Format)E mxf_d10 MXF (Material eXchange Format) D-10 MappingE mxf_opatom MXF (Material eXchange Format) Operational Pattern AtomD mxg MxPEG clipD nc NC camera feedD nistsphere NIST SPeech HEader REsourcesD nsp Computerized Speech Lab NSPD nsv Nullsoft Streaming VideoE null raw null videoDE nut NUTD nuv NuppelVideoE oga Ogg AudioDE ogg OggE ogv Ogg VideoDE oma Sony OpenMG audioE opus Ogg OpusD paf Amazing Studio Packed Animation FileD pam_pipe piped pam sequenceD pbm_pipe piped pbm sequenceD pcx_pipe piped pcx sequenceD pgm_pipe piped pgm sequenceD pgmyuv_pipe piped pgmyuv sequenceD pictor_pipe piped pictor sequenceD pjs PJS (Phoenix Japanimation Society) subtitlesD pmp Playstation Portable PMPD png_pipe piped png sequenceD ppm_pipe piped ppm sequenceD psd_pipe piped psd sequenceE psp PSP MP4 (MPEG-4 Part 14)D psxstr Sony Playstation STRD pva TechnoTrend PVAD pvf PVF (Portable Voice Format)D qcp QCPD qdraw_pipe piped qdraw sequenceD r3d REDCODE R3DDE rawvideo raw videoD realtext RealText subtitle formatD redspark RedSparkD rl2 RL2DE rm RealMediaDE roq raw id RoQD rpl RPL / ARMovieD rsd GameCube RSDDE rso Lego Mindstorms RSODE rtp RTP outputE rtp_mpegts RTP/mpegts output formatDE rtsp RTSP outputDE s16be PCM signed 16-bit big-endianDE s16le PCM signed 16-bit little-endianDE s24be PCM signed 24-bit big-endianDE s24le PCM signed 24-bit little-endianDE s32be PCM signed 32-bit big-endianDE s32le PCM signed 32-bit little-endianD s337m SMPTE 337MDE s8 PCM signed 8-bitD sami SAMI subtitle formatDE sap SAP outputDE sbc raw SBCD sbg SBaGen binaural beats scriptDE scc Scenarist Closed CaptionsE sdl,sdl2 SDL2 output deviceD sdp SDPD sdr2 SDR2D sds MIDI Sample Dump StandardD sdx Sample Dump eXchangeE segment segmentD sgi_pipe piped sgi sequenceD shn raw ShortenD siff Beam Software SIFFE singlejpeg JPEG single imageD sln Asterisk raw pcmDE smjpeg Loki SDL MJPEGD smk SmackerE smoothstreaming Smooth Streaming MuxerD smush LucasArts SmushD sol Sierra SOLDE sox SoX nativeDE spdif IEC 61937 (used on S/PDIF - IEC958)E spx Ogg SpeexDE srt SubRip subtitleD stl Spruce subtitle formatE stream_segment,ssegment streaming segment muxerD subviewer SubViewer subtitle formatD subviewer1 SubViewer v1 subtitle formatD sunrast_pipe piped sunrast sequenceDE sup raw HDMV Presentation Graphic Stream subtitlesD svag Konami PS2 SVAGE svcd MPEG-2 PS (SVCD)D svg_pipe piped svg sequenceDE swf SWF (ShockWave Flash)D tak raw TAKD tedcaptions TED Talks captionsE tee Multiple muxer teeD thp THPD tiertexseq Tiertex Limited SEQD tiff_pipe piped tiff sequenceD tmv 8088flex TMVDE truehd raw TrueHDDE tta TTA (True Audio)D tty Tele-typewriterD txd Renderware TeXture DictionaryD ty TiVo TY StreamDE u16be PCM unsigned 16-bit big-endianDE u16le PCM unsigned 16-bit little-endianDE u24be PCM unsigned 24-bit big-endianDE u24le PCM unsigned 24-bit little-endianDE u32be PCM unsigned 32-bit big-endianDE u32le PCM unsigned 32-bit little-endianDE u8 PCM unsigned 8-bitE uncodedframecrc uncoded framecrc testingD v210 Uncompressed 4:2:2 10-bitD v210x Uncompressed 4:2:2 10-bitD vag Sony PS2 VAGDE vc1 raw VC-1 videoDE vc1test VC-1 test bitstreamE vcd MPEG-1 Systems / MPEG program stream (VCD)D vfwcap VfW video captureD vivo VivoD vmd Sierra VMDE vob MPEG-2 PS (VOB)D vobsub VobSub subtitle formatDE voc Creative VoiceD vpk Sony PS2 VPKD vplayer VPlayer subtitlesD vqf Nippon Telegraph and Telephone Corporation (NTT) TwinVQDE w64 Sony Wave64DE wav WAV / WAVE (Waveform Audio)D wc3movie Wing Commander III movieE webm WebME webm_chunk WebM Chunk MuxerDE webm_dash_manifest WebM DASH ManifestE webp WebPD webp_pipe piped webp sequenceDE webvtt WebVTT subtitleD wsaud Westwood Studios audioD wsd Wideband Single-bit Data (WSD)D wsvqa Westwood Studios VQADE wtv Windows Television (WTV)DE wv raw WavPackD wve Psion 3 audioD xa Maxis XAD xbin eXtended BINary text (XBIN)D xmv Microsoft XMVD xpm_pipe piped xpm sequenceD xvag Sony PS3 XVAGD xwma Microsoft xWMAD yop Psygnosis YOPDE 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 <flags> E........ FLV muxer flags (default 0)aac_seq_header_detect E........ Put AAC sequence header based on stream datano_sequence_end E........ disable sequence end for FLVno_metadata E........ disable metadata for FLVno_duration_filesize E........ disable duration and filesize zero value metadata for FLVadd_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 <boolean> .D.V..... Allocate streams according to the onMetaData array (default false)-missing_streams <int> .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 threadsThreading capabilities: autoSupported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16 nv21 yuv420p10le yuv422p10le y
uv444p10le nv20le
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) (de
fault -1)-aq-mode <int> 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 AQautovariance-biased 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 E..V.....simple E..V.....smart 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 IN
T_MIN)-b-pyramid <int> E..V..... Keep some B-frames as references. (from -1 to INT_MAX) (default -1)none E..V.....strict E..V..... Strictly hierarchical pyramidnormal E..V..... Non-strict (not Blu-ray compatible)-mixed-refs <boolean> E..V..... One reference per partition, as opposed to one reference per macroblock (def
ault 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) (d
efault -1)-partitions <string> E..V..... A comma-separated list of partitions to consider. Possible values: p8x8, p4x
4, b8x8, i8x8, i4x4, none, all-direct-pred <int> 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 <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 E..V.....vbr E..V.....cbr E..V.....-avcintra-class <int> E..V..... AVC-Intra class 50/100/200 (from -1 to 200) (default -1)-me_method <int> 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 <int> 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 <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 E..V.....cavlc E..V.....cabac E..V.....vlc E..V.....ac 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 -1)
-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)-x264-params <string> 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
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