ffmpeg
2007-11-28 (水) 09:25:05更新
カテゴリ[[:]]
はじめに †
性質：MPlayer/MEncoderに比べると、
- コデックを幅広くカバー(libavcodecと言う)。これはMEncoderの-lavfoptsでほぼ全て使え、Win界でもffdshowの名称で移植されている。
- コンテナを幅広くカバー(libavformatと言う)。MEncoderの対応はまだ途上だが、-of -lavfで一部使える。
- ビデオフィルタ類はほとんど無い。
- 全てのコデックに共通のオプションを使う。特定のコデックでは効かないオプションもあり得る。オプション説明の後に(MPEG4)とか(h263+)とか規格が書いてあるものに注意。
- ドキュメント類はMPlayer/MEncoderに比べると未整備。大半はオプションの指定値や範囲が解らない。
MEncoderの-lavcoptsが手がかりになると思われる。
MPlayer/MEncoderと共同でlinux上の動画環境の血液という印象。
コマンド一覧 †
$ ffmpeg
ffmpeg version CVS, build 4759, Copyright (c) 2000-2004 Fabrice Bellard
configuration: ./configure --enable-mp3lame --enable-faac --enable-faad
--enable-amr_nb --disable-ffplay --enable-small --enable-memalign-hack
--enable-gpl --enable-xvid --enable-dts --enable-a52 --disable-vhook
--enable-pthread --enable-x264
built on Nov 8 2005 22:36:20, gcc: 4.0.0 (Apple Computer, Inc. build 5026)
usage: ffmpeg [[infile options] -i infile]... {[outfile options] outfile}...
Hyper fast Audio and Video encoder
Main options: †
-L ：ライセンスを表示 †
show license
-h ：ヘルプを表示 †
show help
＊コマンド一覧と同じものが出る。
-version ：バージョンを表示 †
show version
-formats ：利用できるフォーマット、コデック、プロトコルを表示 †
show available formats, codecs, protocols, ...
-f fmt：出力フォーマットの指定。 †
force format
対応フォーマットは、-formats?参照。
-img img_fmt †
force image format
-i filename †
input file name
-y †
overwrite output files
-t duration †
set the recording time
-fs limit_size †
set the limit file size
-ss time_off †
set the start time offset
-itsoffset time_off †
set the input ts offset
-title string †
set the title
-timestamp time †
set the timestamp
-author string †
set the author
-copyright string †
set the copyright
-comment string †
set the comment
-v verbose †
control amount of logging
-target type：ターゲットファイルタイプの指定。 †
specify target file type ("vcd", "svcd", "dvd", "dv", "pal-vcd", "ntsc-svcd", ...)
-dframes number †
set the number of data frames to record
-hq †
activate high quality settings
-scodec codec †
force subtitle codec ('copy' to copy stream)
-newsubtitle †
add a new subtitle stream to the current output stream
-slang code †
set the ISO 639 language code (3 letters) of the current subtitle stream
Video options: †
-b bitrate †
set video bitrate (in kbit/s)
-vframes number †
set the number of video frames to record
-r rate †
set frame rate (Hz value, fraction or abbreviation)
-maxfr maxfrate †
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)
-fixaspect †
fix aspect ratio
-croptop size †
set top crop band size (in pixels)
-cropbottom size †
set bottom crop band size (in pixels)
-cropleft size †
set left crop band size (in pixels)
-cropright size †
set right crop band size (in pixels)
-padtop size †
set top pad band size (in pixels)
-padbottom size †
set bottom pad band size (in pixels)
-padleft size †
set left pad band size (in pixels)
-padright size †
set right pad band size (in pixels)
-padcolor color †
set color of pad bands (Hex 000000 thru FFFFFF)
-vn †
disable video
-bt tolerance †
set video bitrate tolerance (in kbit/s)
-maxrate bitrate †
set max video bitrate tolerance (in kbit/s)
-minrate bitrate †
set min video bitrate tolerance (in kbit/s)
-bufsize size †
set ratecontrol buffer size (in kByte)
-vcodec codec：映像コデックの指定。'copy'でストリームコピー。 †
force video codec ('copy' to copy stream)
-sameq †
use same video quality as source (implies VBR)
-pass n：パス番号の指定(1か2) †
select the pass number (1 or 2)
-passlogfile file：2パスログファイル名の選択 †
select two pass log file name
- ffmpeg/-passlogfile file?
-newvideo †
add a new video stream to the current output stream
Advanced Video options: †
-pix_fmt format †
set pixel format
-g gop_size †
set the group of picture size
-intra †
use only intra frames
-vdt n †
discard threshold
-qscale q †
use fixed video quantiser scale (VBR)
-qmin q †
min video quantiser scale (VBR)
-qmax q †
max video quantiser scale (VBR)
-lmin lambda †
min video lagrange factor (VBR)
-lmax lambda †
max video lagrange factor (VBR)
-mblmin q †
min macroblock quantiser scale (VBR)
-mblmax q †
max macroblock quantiser scale (VBR)
-qdiff q †
max difference between the quantiser scale (VBR)
-qblur blur †
video quantiser scale blur (VBR)
-qsquish squish †
how to keep quantiser between qmin and qmax (0 = clip, 1 = use differentiable function)
-qcomp compression †
video quantiser scale compression (VBR)
-rc_init_cplx complexity †
initial complexity for 1-pass encoding
-b_qfactor factor †
qp factor between p and b frames
-i_qfactor factor †
qp factor between p and i frames
-b_qoffset offset †
qp offset between p and b frames
-i_qoffset offset †
qp offset between p and i frames
-ibias bias †
intra quant bias
-pbias bias †
inter quant bias
-rc_eq equation †
set rate control equation
-rc_override override †
rate control override for specific intervals
-me method †
set motion estimation method
-dct_algo algo †
set dct algo
-idct_algo algo †
set idct algo
-me_threshold †
motion estimaton threshold
-mb_threshold †
macroblock threshold
-er n †
set error resilience
-ec bit_mask †
set error concealment
-bf frames †
use 'frames' B frames
-mbd mode †
macroblock decision
-mbcmp cmp function †
macroblock compare function
-ildctcmp cmp function †
ildct compare function
-subcmp cmp function †
subpel compare function
-cmp cmp function †
fullpel compare function
-precmp cmp function †
pre motion estimation compare function
-preme †
pre motion estimation
-lelim elim †
single coefficient elimination threshold for luminance (negative values also consider DC coefficient)
-celim elim †
single coefficient elimination threshold for chrominance (negative values also consider DC coefficient)
-lumi_mask †
luminance masking
-dark_mask †
darkness masking
-scplx_mask †
spatial complexity masking
-tcplx_mask †
temporal complexity masking
-p_mask †
inter masking
-4mv †
use four motion vector by macroblock (MPEG4)
-obmc †
use overlapped block motion compensation (h263+?)
オーバーラップしたブロックの動き補償(h263+?)
マクロブロックの境目を目立たないようにする方式の一つ。マクロブロックを碁盤の目のようにきっちり切るのでなく、各ブロックを少しずつ（上下左右斜めの8方向とも）重ねる。
AVC/H.264ではきっちり区切った上で、インループフィルタを使う。
参考；
-lf †
use loop filter (h263+)
-part †
use data partitioning (MPEG4)
-bug param †
workaround not auto detected encoder bugs
-strict strictness †
how strictly to follow the standards
規格適合性の強度。どのくらい厳格に規格を守るかを指定。指定値不明。
-deinterlace †
deinterlace pictures
映像のデインターレース。
mencoderの-vf pp=fdが相当するハズだが、こちらの方が若干良い
-ildct †
force interlaced dct support in encoder (MPEG2/MPEG4)
-ilme †
force interlaced me support in encoder (MPEG2/MPEG4)
-psnr †
calculate PSNR of compressed frames
-vstats †
dump video coding statistics to file
-vhook module †
insert video processing module
-aic †
enable Advanced intra coding (h263+)
-aiv †
enable Alternative inter vlc (h263+)
-umv †
enable Unlimited Motion Vector (h263+)
-ssm †
enable Slice Structured mode (h263+)
-alt †
enable alternate scantable (MPEG2/MPEG4)
-qprd †
-cbp †
-trell †
enable trellis quantization
-mv0 †
try to encode each MB with MV=<0,0> and choose the better one (has no effect if mbd=0)
-naq †
normalize adaptive quantization
-cgop †
closed gop
-sgop †
strict gop
-noout †
skip bitstream encoding
-scan_offset †
enable SVCD Scan Offset placeholder
-qpel †
enable 1/4-pel
-intra_matrix matrix †
specify intra matrix coeffs
-inter_matrix matrix †
specify inter matrix coeffs
-top †
top=1/bottom=0/auto=-1 field first
-nr †
noise reduction
-qns †
quantization noise shaping
-sc_threshold threshold †
scene change threshold
-me_range range †
limit motion vectors range (1023 for DivX player)
-dc precision †
intra_dc_precision
-coder †
coder type
-context †
context model
-pred †
prediction method
-vprofile †
profile
-vlevel †
level
-nssew †
weight
-subq †
-mepc factor (1.0 = 256) †
motion estimation bitrate penalty compensation
-lowres †
-vtag fourcc/tag †
force video tag/fourcc
-skip_threshold threshold †
frame skip threshold
-skip_factor factor †
frame skip factor
-skip_exp exponent †
frame skip exponent
-skip_cmp compare function †
frame skip compare function
-gray †
encode/decode grayscale
Audio options: †
-aframes number †
set the number of audio frames to record
-ab bitrate †
set audio bitrate (in kbit/s)
-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)
-vol volume：音声ボリューム指定。 †
change audio volume (256=normal)
-newaudio †
add a new audio stream to the current output stream
-alang code †
set the ISO 639 language code (3 letters) of the current audio stream
Advanced Audio options: †
-atag fourcc/tag †
force audio tag/fourcc
Subtitle options: †
-scodec codec †
force subtitle codec ('copy' to copy stream)
-newsubtitle †
add a new subtitle stream to the current output stream
-slang code †
set the ISO 639 language code (3 letters) of the current subtitle stream
Audio/Video grab options: †
-vd device †
set video grab device
-vc channel †
set video grab channel (DV1394 only)
-tvstd standard †
set television standard (NTSC, PAL (SECAM))
-ad device †
set audio device
-grab format †
request grabbing using
-gd device †
set grab device
Advanced options: †
-map file:stream[:syncfile:syncstream] †
set input stream mapping
-map_meta_data outfile:infile †
set meta data information of outfile from infile
-debug †
print specific debug info
-vismv †
visualize motion vectors
-benchmark †
add timings for benchmarking
-dump †
dump each input packet
-hex †
when dumping packets, also dump the payload
-bitexact †
only use bit exact algorithms (for codec testing)
-re †
read input at native frame rate
-loop †
loop (current only works with images)
-loop_output †
number of times to loop output in formats that support looping (0 loops forever)
-threads count †
thread count
-vsync †
video sync method
-async †
audio sync method
-vglobal †
video global header storage type
-copyts †
copy timestamps
-shortest †
finish encoding within shortest input
-b_strategy strategy †
dynamic b frame selection strategy
動的なBフレーム選択の方式（の指定）
MEncoder -x264の(no)b_adaptが相当か？
-ps size †
set packet size in bits
-error rate †
error rate
-muxrate rate †
set mux rate
-packetsize size †
set packet size
-muxdelay seconds †
set the maximum demux-decode delay
-muxpreload seconds †
set the initial demux-decode delay
-muxab bitrate †
set the audio bitrate in mux tag (in kbit/s)
-muxvb bitrate †
set the video bitrate in mux tag (in kbit/s)
