ffmpeg.1

arm平台下的H264编码和解码源代码

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.\" ========================================================================
.\"
.IX Title "FFMPEG 1"
.TH FFMPEG 1 "2004-04-16" " " " "
.SH "NAME"
ffmpeg \- FFmpeg video converter
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
ffmpeg [[options][\fB\-i\fR \fIinput_file\fR]]... {[options] \fIoutput_file\fR}...
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
If no input file is given, audio/video grabbing is done.
.PP
As a general rule, options are applied to the next specified
file. For example, if you give the \fB\-b 64\fR option, it sets the video
bitrate of the next file. Format option may be needed for raw input
files.
.PP
By default, ffmpeg tries to convert as losslessly as possible: it
uses the same audio and video parameter for the outputs as the one
specified for the inputs.
.SH "OPTIONS"
.IX Header "OPTIONS"
.Sh "Main options"
.IX Subsection "Main options"
.IP "\fB\-L\fR" 4
.IX Item "-L"
show license
.IP "\fB\-h\fR" 4
.IX Item "-h"
show help
.IP "\fB\-formats\fR" 4
.IX Item "-formats"
show available formats, codecs, protocols, ...
.IP "\fB\-f fmt\fR" 4
.IX Item "-f fmt"
force format
.IP "\fB\-i filename\fR" 4
.IX Item "-i filename"
input file name
.IP "\fB\-y\fR" 4
.IX Item "-y"
overwrite output files
.IP "\fB\-t duration\fR" 4
.IX Item "-t duration"
set the recording time in seconds. \f(CW\*(C`hh:mm:ss[.xxx]\*(C'\fR syntax is also
supported.
.IP "\fB\-ss position\fR" 4
.IX Item "-ss position"
seek to given time position. \f(CW\*(C`hh:mm:ss[.xxx]\*(C'\fR syntax is also
supported.
.IP "\fB\-title string\fR" 4
.IX Item "-title string"
set the title
.IP "\fB\-author string\fR" 4
.IX Item "-author string"
set the author
.IP "\fB\-copyright string\fR" 4
.IX Item "-copyright string"
set the copyright
.IP "\fB\-comment string\fR" 4
.IX Item "-comment string"
set the comment
.IP "\fB\-target type\fR" 4
.IX Item "-target type"
specify target file type (\*(L"vcd\*(R", \*(L"svcd\*(R" or \*(L"dvd\*(R"). All the format
options (bitrate, codecs, buffer sizes) are automatically set by this
option. You can just type:
.Sp
.Vb 1
\&        ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
.Ve
.IP "\fB\-hq\fR" 4
.IX Item "-hq"
activate high quality settings
.Sh "Video Options"
.IX Subsection "Video Options"
.IP "\fB\-b bitrate\fR" 4
.IX Item "-b bitrate"
set the video bitrate in kbit/s (default = 200 kb/s)
.IP "\fB\-r fps\fR" 4
.IX Item "-r fps"
set frame rate (default = 25)
.IP "\fB\-s size\fR" 4
.IX Item "-s size"
set frame size. The format is \fBWxH\fR (default 160x128).  The
following abbreviations are recognized:
.RS 4
.IP "\fBsqcif\fR" 4
.IX Item "sqcif"
128x96
.IP "\fBqcif\fR" 4
.IX Item "qcif"
176x144
.IP "\fBcif\fR" 4
.IX Item "cif"
352x288
.IP "\fB4cif\fR" 4
.IX Item "4cif"
704x576
.RE
.RS 4
.RE
.IP "\fB\-aspect aspect\fR" 4
.IX Item "-aspect aspect"
set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
.IP "\fB\-croptop size\fR" 4
.IX Item "-croptop size"
set top crop band size (in pixels)
.IP "\fB\-cropbottom size\fR" 4
.IX Item "-cropbottom size"
set bottom crop band size (in pixels)
.IP "\fB\-cropleft size\fR" 4
.IX Item "-cropleft size"
set left crop band size (in pixels)
.IP "\fB\-cropright size\fR" 4
.IX Item "-cropright size"
set right crop band size (in pixels)
.IP "\fB\-padtop size\fR" 4
.IX Item "-padtop size"
set top pad band size (in pixels)
.IP "\fB\-padbottom size\fR" 4
.IX Item "-padbottom size"
set bottom pad band size (in pixels)
.IP "\fB\-padleft size\fR" 4
.IX Item "-padleft size"
set left pad band size (in pixels)
.IP "\fB\-padright size\fR" 4
.IX Item "-padright size"
set right pad band size (in pixels)
.IP "\fB\-padcolor color\fR" 4
.IX Item "-padcolor color"
set right pad band size (hex). The value for pad color is expressed 
as a six digit hexidecimal number where the first two digits represent red, 
middle two digits green and last two digits blue. Defaults to 000000 (black)
.IP "\fB\-vn\fR" 4
.IX Item "-vn"
disable video recording
.IP "\fB\-bt tolerance\fR" 4
.IX Item "-bt tolerance"
set video bitrate tolerance (in kbit/s)
.IP "\fB\-maxrate bitrate\fR" 4
.IX Item "-maxrate bitrate"
set max video bitrate tolerance (in kbit/s)
.IP "\fB\-minrate bitrate\fR" 4
.IX Item "-minrate bitrate"
set min video bitrate tolerance (in kbit/s)
.IP "\fB\-bufsize size\fR" 4
.IX Item "-bufsize size"
set ratecontrol buffere size (in kbit)
.IP "\fB\-vcodec codec\fR" 4
.IX Item "-vcodec codec"
force video codec to \fIcodec\fR. Use the \f(CW\*(C`copy\*(C'\fR special value to
tell that the raw codec data must be copied as is.
.IP "\fB\-sameq\fR" 4
.IX Item "-sameq"
use same video quality as source (implies \s-1VBR\s0)
.IP "\fB\-pass n\fR" 4
.IX Item "-pass n"
select the pass number (1 or 2). It is useful to do two pass
encoding. The statistics of the video are recorded in the first pass and
the video at the exact requested bit rate is generated in the second
pass.
.IP "\fB\-passlogfile file\fR" 4
.IX Item "-passlogfile file"
select two pass log file name to \fIfile\fR.
.Sh "Advanced Video Options"
.IX Subsection "Advanced Video Options"
.IP "\fB\-g gop_size\fR" 4
.IX Item "-g gop_size"
set the group of picture size
.IP "\fB\-intra\fR" 4
.IX Item "-intra"
use only intra frames
.IP "\fB\-qscale q\fR" 4
.IX Item "-qscale q"
use fixed video quantiser scale (\s-1VBR\s0)
.IP "\fB\-qmin q\fR" 4
.IX Item "-qmin q"
min video quantiser scale (\s-1VBR\s0)
.IP "\fB\-qmax q\fR" 4
.IX Item "-qmax q"
max video quantiser scale (\s-1VBR\s0)
.IP "\fB\-qdiff q\fR" 4
.IX Item "-qdiff q"
max difference between the quantiser scale (\s-1VBR\s0)
.IP "\fB\-qblur blur\fR" 4
.IX Item "-qblur blur"
video quantiser scale blur (\s-1VBR\s0)
.IP "\fB\-qcomp compression\fR" 4
.IX Item "-qcomp compression"
video quantiser scale compression (\s-1VBR\s0)
.IP "\fB\-rc_init_cplx complexity\fR" 4
.IX Item "-rc_init_cplx complexity"
initial complexity for 1\-pass encoding
.IP "\fB\-b_qfactor factor\fR" 4
.IX Item "-b_qfactor factor"
qp factor between p and b frames
.IP "\fB\-i_qfactor factor\fR" 4
.IX Item "-i_qfactor factor"
qp factor between p and i frames
.IP "\fB\-b_qoffset offset\fR" 4
.IX Item "-b_qoffset offset"
qp offset between p and b frames
.IP "\fB\-i_qoffset offset\fR" 4
.IX Item "-i_qoffset offset"
qp offset between p and i frames
.IP "\fB\-rc_eq equation\fR" 4
.IX Item "-rc_eq equation"
set rate control equation. Default is \f(CW\*(C`tex^qComp\*(C'\fR.
.IP "\fB\-rc_override override\fR" 4
.IX Item "-rc_override override"
rate control override for specific intervals
.IP "\fB\-me method\fR" 4
.IX Item "-me method"
set motion estimation method to \fImethod\fR. Available methods are
(from lower to best quality):
.RS 4
.IP "\fBzero\fR" 4
.IX Item "zero"
Try just the (0, 0) vector.
.IP "\fBphods\fR" 4
.IX Item "phods"
.PD 0
.IP "\fBlog\fR" 4
.IX Item "log"
.IP "\fBx1\fR" 4
.IX Item "x1"
.IP "\fBepzs\fR" 4
.IX Item "epzs"
.PD
(default method)
.IP "\fBfull\fR" 4
.IX Item "full"
exhaustive search (slow and marginally better than epzs)
.RE
.RS 4
.RE
.IP "\fB\-dct_algo algo\fR" 4
.IX Item "-dct_algo algo"
set dct algorithm to \fIalgo\fR. Available values are:
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
\&\s-1FF_DCT_AUTO\s0 (default)
.IP "\fB1\fR" 4
.IX Item "1"
\&\s-1FF_DCT_FASTINT\s0
.IP "\fB2\fR" 4
.IX Item "2"
\&\s-1FF_DCT_INT\s0
.IP "\fB3\fR" 4
.IX Item "3"
\&\s-1FF_DCT_MMX\s0
.IP "\fB4\fR" 4
.IX Item "4"
\&\s-1FF_DCT_MLIB\s0
.IP "\fB5\fR" 4
.IX Item "5"
\&\s-1FF_DCT_ALTIVEC\s0
.RE
.RS 4
.RE
.IP "\fB\-idct_algo algo\fR" 4
.IX Item "-idct_algo algo"
set idct algorithm to \fIalgo\fR. Available values are: