ffmpeg命令行参数

常用参数

-i 文件名 (指定源文件)  -ac 2(声道数，1，2等) -ar 24000(音频采样频率，48000，44100，24000，22050，11025，8000等。 -ab 128(32、64、96、128、256等) -vol 200(音量200%，音量百分比) -acodec aac(音频编码器，aac lammp3 等）  -r 29.97(帧率，每秒视频帧数) -s 320x240 (指定视频分辨率) -b 768 (视频码率，似乎ffmpeg是自动VBR是的，指定的大概是平均比特率，比如768，1500) -aspect 16:9 (设置横纵比 4:3 16:9 或 1.3333 1.7777) -croptop 10 -cropbottom 10 -cropleft 10 -cropright 10 (设置切除带大小 像素单位) -padtop 10 -padbottom 10 -padleft 10 -padright 10 (设置补条大小 像素单位) -padcolor FF0000 (设置补齐条颜色[16进制,RRGGBB]) -maxrate 768 (设置最大视频码率) -minrate 768 (设置最小视频码率) -bufsize 1000000 (设置码率控制缓冲区大小，单位bit)  -f mp3 (指定文件格式，ac3,avi,dv,gxf,h264,m2v,m4v,mov,mp2,mp3,mp4,mpeg,mpegts,rawvideo,vob,wav)   -y (不询问，直接覆盖目标文件) -title 标题 (设置标题) -author 作者名 (设置作者) -copyright 版权信息 (设置版权) -comment 评论文字 (设置评论)

示例

ffmpeg.exe -i aaa.mp3 -ab 56 -ac 1 -ar 22050 bbb.mp3

详细说明英文版

GenericSyntax

ffmpeg [[infile options][`-i' infile]]... {[outfile options] outfile}...

Note:Asageneralrule,optionsareappliedtothenextspecifiedfile.Therefore,orderisimportantandyoucanhavethesameoptiononthecommandlinemultipletimes.Eachoccurrenceisthenappliedtothenextinputoroutputfile.

MainOptions

-ab <int> : Set audio bitrate in bit/s ( default = 64k ). -acodec <string> : Force audio codec.     aac : AAC-LC     ac3 : AC3 ( Dolby Digital )     copy : Copy raw codec data as is.     mp2 : MPEG Audio Layer II     mp3 : MPEG Audio Layer III     pcm_s16le : Uncompressed 16-bit PCM Audio -an : Disable audio. -ar <int> : Set audio sampling frequency in Hz ( default = 44100 Hz ). -aspect <string or float> : Set aspect ratio ( 4:3, 16:9, 1.3333, 1.7777 ). -async <int> : Audio sync method. Audio will be stretched or squeezed to match the timestamps. The parameter is the maximum samples per second by which the audio is changed. -async 1 is a special case where only the start of the audio stream is corrected without any later correction. -b <int> : Set video bitrate in bit/s ( default = 200k ). -bf <int> : Set number of B-frames ( supported for MPEG-1, MPEG-2 and MPEG-4 ). -b_strategy <boolean> : Strategy to choose between I/P/B-frames ( 0 = off / 1 = on ). -bufsize <int> : Set rate ontrol buffer size ( in bits ).
-cmp <string or int> : Full pel motion estimation compare function.
    sad ( 0 ) : Sum of absolute differences, fast ( default ).
    sse ( 1 ) : Sum of squared errors.
    satd ( 2 ) : Sum of absolute Hadamard transformed differences.
    dct ( 3 ) : Sum of absolute DCT transformed differences.
    psnr ( 4 ) : Sum of squared quantization errors ( avoid, low quality ).
    bit ( 5 ) : Number of bits needed for the block.
    rd ( 6 ) : Rate distortion optimal, slow.
    zero ( 7 ) : 0.
    vsad ( 8 ) : Sum of absolute vertical differences.
    vsse ( 9 ) : Sum of squared vertical differences.
    nsse ( 10 ) : Noise preserving sum of squared differences.
    w53 ( 11 ) : 5/3 wavelet ( only used in Snow ).
    w97 ( 12 ) : 9/7 wavelet ( only used in Snow ).
    dctmax ( 13 )
    chroma ( 14 )
-coder <string or int> :
    vlc ( 0 ) : Variable length coder / huffman coder.
    ac ( 1 ) : Arithmetic coder.
    raw ( 2 ) : Raw ( no encoding ).
    rle ( 3 ) : Run-length coder.
    deflate ( 4 ) : Deflate-based coder.
-cropbottom <int> : Set bottom crop band size ( in pixels ).
-cropleft <int> : Set left crop band size ( in pixels ).
-cropright <int> : Set right crop band size ( in pixels ).
-croptop <int> : Set top crop band size ( in pixels ).
-deinterlace : Deinterlace pictures.
-dc <int> : Intra DC precision.
-f <string> : Force file format.
    ac3 : Raw AC3
    avi : AVI
    dv : DV
    gxf : GXF ( General eXchange Format )
    h264 : Raw H.264
    m2v : MPEG-2 Video Elemetary Stream
    m4v : MPEG-4 Video Elemetary Stream
    mov : QuickTime
    mp2 : MPEG Audio Layer II
    mp3 : MPEG Audio Layer III
    mp4 : MP4
    mpeg : MPEG-1 System Stream
    mpegts : MPEG-2 Transport Stream
    rawvideo : RAW Video
    vob : MPEG-2 Program Stream
    wav : WAV
-flags <string> :
    aic : H.263 advanced intra coding / MPEG-4 ac prediction.
    aiv : H.263 alternative inter VLC.
    alt : Enable alternate scantable ( MPEG-2/MPEG-4 ).
    bitexact : Use only bitexact stuff ( except (i)dct ).
    cbp : Use rate distortion optimization for cbp.
    cgop : Closed GOP.
    gmc : Use global motion compensation.
    gray : Only decode/encode grayscale.
    ildct : Use interlaced DCT.
    ilme : Interlaced motion estimation.
    loop : Use loop filter.
    low_delay : Force low delay.
    mv0 : Always try a mb with mv=<0,0>.
    mv4 : Use four motion vector by macroblock ( MPEG-4 ).
    naq : Normalize adaptive quantization.
    obmc : Use overlapped block motion compensation ( H.263+ ).
    part : Use data partitioning.
    psnr : Error variables will be set during encoding.
    qpel : Use 1/4 pel motion compensation.
    qprd : Use rate distortion optimization for qp selection.
    scan_offset : Will reserve space for svcd scan offset user data.
    slice
    trell : Use trellis quantization.
    umv : Use unlimited motion vectors.
-flags2 <string> :
    aud : Access unit delimiters ( H.264 ).
    bpyramid : Allows B-frames to be used as references for predicting.
    brdo : B-frame rate-distortion optimization.
    dct8x8 : High profile 8x8 transform ( H.264 ).
    drop_frame_timecode
    fast : Allow non spec compliant speedup tricks.
    fastpskip : Fast pskip ( H.264 ).
    ivlc : Intra VLC table.
    local_header : Place global headers at every keyframe instead of in extradata.
    mixed_refs : One reference per partition, as opposed to one reference per macroblock.
    non_linear_q : Use non linear quantizer.
    noout : Skip bitstream encoding.
    sgop : Strictly enforce GOP size.
    skiprd : RD optimal macroblock level residual skipping.
    wpred : Weighted biprediction for B-frames ( H.264 ).
-formats : Show available formats, codecs, protocols, etc.
-g <int> : Set the group of pictures ( GOP ) size.
-genpts <boolean> : Generate PTS ( 0 = off / 1 = on ).
-h : Show help.
-i <string> : Input file name.
-intra : Use only intra frames ( I-frames ).
-loop_input : Loop ( only works with still images ).
-map <file:stream>[:syncfile:syncstream] : Set input stream mapping.
-maxrate <int> : Set maximum video bitrate tolerance ( in bit/s ).
-me <string or int> : Set motion estimation method.
    dia ( 1 ) : Diamond search, radius 1 ( fast ).
    hex ( 2 ) : Hexagonal search, radius 2 ( default ).
    umh ( 3 ) : Uneven multi-hexagon search.
    esa ( 4 ) : Exhaustive search ( slow ).
-mbd <string> : Macroblock decision algorithm ( high quality mode ).
    simple : Use mbcmp ( default ).
    bits : Use fewest bits.
    rd : Use best rate distortion.
-minrate <int> : Set minimum video bitrate tolerance ( in bit/s ).
-padbottom <int> : Set bottom pad band size ( in pixels ).
-padcolor <int> : Set color of pad bands ( Hex 000000 to FFFFFF ).
-padleft <int> : Set left pad band size ( in pixels ).
-padright <int> : Set right pad band size ( in pixels ).
-padtop <int> : Set top pad band size ( in pixels ).
-pass <int> : Select the pass number ( 1 or 2 ). The statistics of the video are recorded in the first pass and the video is generated at the exact requested bitrate in the second pass.
-pix_fmt <string> : Set pixel format.
    yuv420p
    yuv422p
    yuv444p
    yuv422
    yuv410p
    yuv411p
    yuvj420p
    yuvj422p
    yuvj444p
    rgb24
    bgr24
    rgba32
    rgb565
    rgb555
    gray
    monow
    monob
    pal8
-ps <int> : Set packet size in bits.
-qmax <int> : Maximum video quantizer scale ( VBR ).
-qmin <int> : Minimum video quantizer scale ( VBR ).
-r <int or string> : Set frame rate ( Hz value, fraction or abbreviation ). For example : 25, 30000/1001, etc.
-rc_init_occupancy <int> : Number of bits which should be loaded into the rate control buffer before decoding starts.
-s <string> : Set frame size ( WidthxHeight or abreviation ).
-subcmp <string or int> : Sub pel motion estimation compare function.
    sad ( 0 ) : Sum of absolute differences, fast ( default ).
    sse ( 1 ) : Sum of squared errors.
    satd ( 2 ) : Sum of absolute Hadamard transformed differences.
    dct ( 3 ) : Sum of absolute DCT transformed differences.
    psnr ( 4 ) : Sum of squared quantization errors ( avoid, low quality ).
    bit ( 5 ) : Number of bits needed for the block.
    rd ( 6 ) : Rate distortion optimal, slow.
    zero ( 7 ) : 0.
    vsad ( 8 ) : Sum of absolute vertical differences.
    vsse ( 9 ) : Sum of squared vertical differences.
    nsse ( 10 ) : Noise preserving sum of squared differences.
    w53 ( 11 ) : 5/3 wavelet ( only used in Snow ).
    w97 ( 12 ) : 9/7 wavelet ( only used in Snow ).
    dctmax ( 13 )
    chroma ( 14 )
-ss <timecode> : Set start time offset in seconds or hh:mm:ss[.xxx] format.
-t <timecode> : Set recording time in seconds or hh:mm:ss[.xxx] format.
-timecode_frame_start <int> : Set GOP start timecode value in number of frames ( ex: 1282748 for 14:15:09:23 ). Drop Frame mode is not supported.
-top <int> : Field dominance ( top = 1 / bottom = 0 / auto = -1 ).
-trellis <int> : Rate-distortion optimal quantization.
-vbsf <string> : Bitstream filters.
    dump_extra
    imxdump
    noise
    remove_extra
-vcodec <string> : Force video codec.
    copy : Copy raw codec data as is.
    dvvideo : DV Video
    ffv1 : FFV1 lossless video codec
    h264 : H.264
    mpeg2video : MPEG-2 Video
    rawvideo : RAW Video
    xvid : XviD ( MPEG-4 Part 2 )
-version : Show version.
-vframes <int> : Set the number of video frames to record.
-vn : Disable video.
-vol <int> : Modify audio volume ( 256=normal ).
-vsync <int> : Video sync method. Video will be stretched or squeezed to match the timestamps, it is done by duplicating and dropping frames. With -map option, you can select from which stream the timestamps should be taken. You can leave either video or audio unchanged and sync the remaining stream(s) to the unchanged one.
-vtag <string> : Force video FourCC/Tag.
-y : Overwrite output files.

Encoding

D10 (aka Sony IMX) Encoding

ffmpeg -async 1 -i <input_file> -vcodec mpeg2video -r 25 -pix_fmt yuv422p -minrate 50000k -maxrate 50000k -b 50000k -intra -flags +ildct+low_delay -dc 10 -flags2 +ivlc+non_linear_q -ps 1 -qmin 1 -qmax 3 -top 1 -bufsize 2000000 -rc_init_occupancy 2000000 -rc_buf_aggressivity 0.25 -an output.m2v

Notes : - Only works for 25 fps content. - Change minrate, maxrate and b values to 30000k / 40000k / 50000k in order to produce 30/40/50 Mbps D10 essence. - Set bufsize and rc_init_occupancy values to 1200000 / 1600000 / 2000000 for 30/40/50 Mbps D10 essence. - Add the -padtop 32 option if you want to produce a 720x608 D10 image size from a 720x576 source.

DVCAM / DVCPRO25 / DVCPRO50 Encoding

ffmpeg -i <input_file> -pix_fmt yuv420p output_DVCAM.dv
ffmpeg -i <input_file> -pix_fmt yuv411p output_DVCPRO25.dv
ffmpeg -i <input_file> -pix_fmt yuv422p output_DVCPRO50.dv

VC-3 (aka Avid DNxHD) Encoding

ffmpeg -i <input_file> -vcodec dnxhd -b <bitrate> -an output.mov

Notes : - <bitrate> can take the following values : 36Mb, 120Mb, 185Mb ( please refer to the following table ). - Add the following option for interlaced modes : -flags +ildct - Add the following option for best quality mode ( very slow ! ) : -mbd rd

Supported Resolutions : Project Format  Resolution  Frame Size  Bits  FPS  <bitrate> 1080i / 59.94  DNxHD 220  1920 x 1080  8  29.97  185Mb 1080i / 59.94  DNxHD 145  1920 x 1080  8  29.97  120Mb 1080i / 50  DNxHD 185  1920 x 1080  8  25  185Mb 1080i / 50  DNxHD 120  1920 x 1080  8  25  120Mb 1080p / 25  DNxHD 185  1920 x 1080  8  25  185Mb 1080p / 25  DNxHD 120  1920 x 1080  8  25  120Mb 1080p / 25  DNxHD 36  1920 x 1080  8  25  36Mb 1080p / 24  DNxHD 175  1920 x 1080  8  24  185Mb 1080p / 24  DNxHD 115  1920 x 1080  8  24  120Mb 1080p / 24  DNxHD 36  1920 x 1080  8  24  36Mb 1080p / 23.976  DNxHD 175  1920 x 1080  8  23.976  185Mb 1080p / 23.976  DNxHD 115  1920 x 1080  8  23.976  120Mb 1080p / 23.976  DNxHD 36  1920 x 1080  8  23.976  36Mb 1080p / 29.7  DNxHD 45  1920 x 1080  8  29.97  36Mb

FFV1 Encoding

ffmpeg -i <input_file> -vcodec ffv1 -an output.mov
H.264 I-frame only Highest Quality Encoding
ffmpeg -i <input_file> -vcodec h264 -cqp 1 -intra -coder ac -an output.mp4

H.264 Long GOP Encoding

ffmpeg -i <input_file> -vcodec h264 -b <video_bitrate> -g <gop_size> -bf 2 -b_strategy 1 -flags +loop -coder 1 -subcmp 2 -cmp 2 -trellis 2 -me hex -acodec aac -ab <audio_bitrate> output.mp4

MPEG-2 I-frame only Highest Quality Encoding

ffmpeg -i <input_file> -vcodec mpeg2video -qscale 1 -qmin 1 -intra -an output.m2v

MPEG-2 Long GOP Encoding

ffmpeg -i <input_file> -vcodec mpeg2video -b <video_bitrate> -g <gop_size> -bf 2 -b_strategy 1 -acodec mp2 -ab <audio_bitrate> -f vob output.mpg

D10 into QuickTime Wrapping

ffmpeg -i <input_file> -vcodec copy -acodec pcm_s16le -vtag mx5p -vbsf imxdump output.mov

Notes : - This feature needs a patched version of FFmpeg not available in the current SVN, please contact Baptiste Coudurier or Olivier Amato for more information. - Set -vtag to mx3p / mx4p / m5xp for D10 30/40/50 PAL or mx3n / mx4n / m5xn for D10 30/40/50 NTSC. - Input D10 image size must be 720x608 ( use -padtop 32 option during D10 encoding if the original image size is 720x576 ). - Final Cut Pro compliant.

MPEG-2 Program Stream Muxing

ffmpeg -genpts 1 -i ES_Video.m2v -i ES_Audio.mp2 -vcodec copy -acodec copy -f vob output.mpg

MPEG-2 Program Stream Demuxing

ffmpeg -i input.mpg -vcodec copy -f mpeg2video ES_Video.m2v -acodec copy -f mp2 ES_Audio.mp2

Note : This also works for files containing multiple audio tracks :

ffmpeg -i input.mpg -vcodec copy -f mpeg2video ES_Video.m2v -acodec copy -f mp2 ES_Audio1.mp2 -acodec copy -f mp2 ES_Audio2.mp2

MPEG-2 Start Timecode

ffmpeg -i <input_file> -timecode_frame_start <start_timecode> -vcodec mpeg2video -an output.m2v

Note : Start timecode is set as number of frames. For instance, if you want to start at 18:12:36:15, you will have to set -timecode_frame_start to 1638915 ( for 25 fps content ).

Audio Volume Modification

ffmpeg -i <input_file> -vol <audio_volume> -acodec <audio_codec> <output_file>

Input Stream Selection

ffmpeg -i input.vob -map 0:2 -acodec aac -ab <audio_bitrate> -vn output.mp4

Transcode audio stream #0:2.

Sub-clip Creation

ffmpeg -i <input_file> -ss <timecode> -t <timecode> -vcodec copy -acodec copy <output_file>

Make a Video File from a Single Frame

ffmpeg -loop_input -vframes <number_of_frames> -i <input_file> <output_file>

Please submit new command lines to Olivier Amato