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| | | .IX Title "FFMPEG-SCALER 1" |
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| | | .TH FFMPEG-SCALER 1 " " " " " " |
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| | | .\" way too many mistakes in technical documents. |
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| | | .if n .ad l |
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| | | .nh |
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| | | .SH "NAME" |
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| | | ffmpeg\-scaler \- FFmpeg video scaling and pixel format converter |
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| | | .SH "DESCRIPTION" |
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| | | .IX Header "DESCRIPTION" |
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| | | The FFmpeg rescaler provides a high-level interface to the libswscale |
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| | | library image conversion utilities. In particular it allows one to perform |
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| | | image rescaling and pixel format conversion. |
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| | | .SH "SCALER OPTIONS" |
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| | | .IX Header "SCALER OPTIONS" |
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| | | The video scaler supports the following named options. |
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| | | .PP |
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| | | Options may be set by specifying \-\fIoption\fR \fIvalue\fR in the |
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| | | FFmpeg tools. For programmatic use, they can be set explicitly in the |
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| | | \&\f(CW\*(C`SwsContext\*(C'\fR options or through the \fIlibavutil/opt.h\fR \s-1API\s0. |
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| | | .IP "\fBsws_flags\fR" 4 |
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| | | .IX Item "sws_flags" |
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| | | Set the scaler flags. This is also used to set the scaling |
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| | | algorithm. Only a single algorithm should be selected. Default |
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| | | value is \fBbicubic\fR. |
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| | | .Sp |
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| | | It accepts the following values: |
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| | | .RS 4 |
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| | | .IP "\fBfast_bilinear\fR" 4 |
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| | | .IX Item "fast_bilinear" |
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| | | Select fast bilinear scaling algorithm. |
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| | | .IP "\fBbilinear\fR" 4 |
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| | | .IX Item "bilinear" |
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| | | Select bilinear scaling algorithm. |
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| | | .IP "\fBbicubic\fR" 4 |
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| | | .IX Item "bicubic" |
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| | | Select bicubic scaling algorithm. |
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| | | .IP "\fBexperimental\fR" 4 |
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| | | .IX Item "experimental" |
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| | | Select experimental scaling algorithm. |
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| | | .IP "\fBneighbor\fR" 4 |
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| | | .IX Item "neighbor" |
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| | | Select nearest neighbor rescaling algorithm. |
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| | | .IP "\fBarea\fR" 4 |
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| | | .IX Item "area" |
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| | | Select averaging area rescaling algorithm. |
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| | | .IP "\fBbicublin\fR" 4 |
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| | | .IX Item "bicublin" |
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| | | Select bicubic scaling algorithm for the luma component, bilinear for |
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| | | chroma components. |
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| | | .IP "\fBgauss\fR" 4 |
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| | | .IX Item "gauss" |
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| | | Select Gaussian rescaling algorithm. |
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| | | .IP "\fBsinc\fR" 4 |
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| | | .IX Item "sinc" |
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| | | Select sinc rescaling algorithm. |
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| | | .IP "\fBlanczos\fR" 4 |
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| | | .IX Item "lanczos" |
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| | | Select Lanczos rescaling algorithm. |
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| | | .IP "\fBspline\fR" 4 |
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| | | .IX Item "spline" |
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| | | Select natural bicubic spline rescaling algorithm. |
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| | | .IP "\fBprint_info\fR" 4 |
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| | | .IX Item "print_info" |
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| | | Enable printing/debug logging. |
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| | | .IP "\fBaccurate_rnd\fR" 4 |
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| | | .IX Item "accurate_rnd" |
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| | | Enable accurate rounding. |
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| | | .IP "\fBfull_chroma_int\fR" 4 |
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| | | .IX Item "full_chroma_int" |
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| | | Enable full chroma interpolation. |
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| | | .IP "\fBfull_chroma_inp\fR" 4 |
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| | | .IX Item "full_chroma_inp" |
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| | | Select full chroma input. |
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| | | .IP "\fBbitexact\fR" 4 |
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| | | .IX Item "bitexact" |
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| | | Enable bitexact output. |
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| | | .RE |
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| | | .RS 4 |
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| | | .RE |
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| | | .IP "\fBsrcw\fR" 4 |
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| | | .IX Item "srcw" |
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| | | Set source width. |
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| | | .IP "\fBsrch\fR" 4 |
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| | | .IX Item "srch" |
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| | | Set source height. |
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| | | .IP "\fBdstw\fR" 4 |
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| | | .IX Item "dstw" |
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| | | Set destination width. |
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| | | .IP "\fBdsth\fR" 4 |
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| | | .IX Item "dsth" |
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| | | Set destination height. |
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| | | .IP "\fBsrc_format\fR" 4 |
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| | | .IX Item "src_format" |
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| | | Set source pixel format (must be expressed as an integer). |
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| | | .IP "\fBdst_format\fR" 4 |
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| | | .IX Item "dst_format" |
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| | | Set destination pixel format (must be expressed as an integer). |
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| | | .IP "\fBsrc_range\fR" 4 |
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| | | .IX Item "src_range" |
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| | | Select source range. |
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| | | .IP "\fBdst_range\fR" 4 |
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| | | .IX Item "dst_range" |
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| | | Select destination range. |
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| | | .IP "\fBparam0, param1\fR" 4 |
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| | | .IX Item "param0, param1" |
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| | | Set scaling algorithm parameters. The specified values are specific of |
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| | | some scaling algorithms and ignored by others. The specified values |
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| | | are floating point number values. |
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| | | .IP "\fBsws_dither\fR" 4 |
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| | | .IX Item "sws_dither" |
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| | | Set the dithering algorithm. Accepts one of the following |
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| | | values. Default value is \fBauto\fR. |
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| | | .RS 4 |
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| | | .IP "\fBauto\fR" 4 |
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| | | .IX Item "auto" |
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| | | automatic choice |
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| | | .IP "\fBnone\fR" 4 |
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| | | .IX Item "none" |
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| | | no dithering |
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| | | .IP "\fBbayer\fR" 4 |
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| | | .IX Item "bayer" |
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| | | bayer dither |
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| | | .IP "\fBed\fR" 4 |
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| | | .IX Item "ed" |
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| | | error diffusion dither |
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| | | .IP "\fBa_dither\fR" 4 |
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| | | .IX Item "a_dither" |
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| | | arithmetic dither, based using addition |
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| | | .IP "\fBx_dither\fR" 4 |
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| | | .IX Item "x_dither" |
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| | | arithmetic dither, based using xor (more random/less apparent patterning that |
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| | | a_dither). |
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| | | .RE |
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| | | .RS 4 |
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| | | .RE |
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| | | .IP "\fBalphablend\fR" 4 |
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| | | .IX Item "alphablend" |
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| | | Set the alpha blending to use when the input has alpha but the output does not. |
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| | | Default value is \fBnone\fR. |
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| | | .RS 4 |
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| | | .IP "\fBuniform_color\fR" 4 |
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| | | .IX Item "uniform_color" |
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| | | Blend onto a uniform background color |
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| | | .IP "\fBcheckerboard\fR" 4 |
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| | | .IX Item "checkerboard" |
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| | | Blend onto a checkerboard |
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| | | .IP "\fBnone\fR" 4 |
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| | | .IX Item "none" |
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| | | No blending |
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| | | .RE |
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| | | .RS 4 |
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| | | .RE |
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| | | .SH "SEE ALSO" |
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| | | .IX Header "SEE ALSO" |
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| | | \&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIlibswscale\fR\|(3) |
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| | | .SH "AUTHORS" |
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| | | .IX Header "AUTHORS" |
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| | | The FFmpeg developers. |
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| | | .PP |
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| | | For details about the authorship, see the Git history of the project |
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| | | (git://source.ffmpeg.org/ffmpeg), e.g. by typing the command |
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| | | \&\fBgit log\fR in the FFmpeg source directory, or browsing the |
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| | | online repository at <\fBhttp://source.ffmpeg.org\fR>. |
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| | | .PP |
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| | | Maintainers for the specific components are listed in the file |
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| | | \&\fI\s-1MAINTAINERS\s0\fR in the source code tree. |
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