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.\" ========================================================================
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.\"
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.IX Title "FFMPEG-SCALER 1"
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.TH FFMPEG-SCALER 1 " " " " " "
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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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
|
.IX Item "x_dither"
|
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
|
.IX Item "alphablend"
|
Set the alpha blending to use when the input has alpha but the output does not.
|
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
|
.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"
|
.IX Header "SEE ALSO"
|
\&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIlibswscale\fR\|(3)
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.SH "AUTHORS"
|
.IX Header "AUTHORS"
|
The FFmpeg developers.
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.PP
|
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>.
|
.PP
|
Maintainers for the specific components are listed in the file
|
\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.
|
