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Give users and developers a way to opt in to the new format conversion code, and more code from the swscale rewrite in general, even while development is still ongoing.
157 lines
3.4 KiB
Plaintext
157 lines
3.4 KiB
Plaintext
@anchor{scaler_options}
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@chapter Scaler Options
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@c man begin SCALER OPTIONS
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The video scaler supports the following named options.
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Options may be set by specifying -@var{option} @var{value} in the
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FFmpeg tools, with a few API-only exceptions noted below.
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For programmatic use, they can be set explicitly in the
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@code{SwsContext} options or through the @file{libavutil/opt.h} API.
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@table @option
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@anchor{sws_flags}
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@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 @samp{bicubic}.
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It accepts the following values:
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@table @samp
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@item fast_bilinear
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Select fast bilinear scaling algorithm.
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@item bilinear
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Select bilinear scaling algorithm.
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@item bicubic
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Select bicubic scaling algorithm.
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@item experimental
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Select experimental scaling algorithm.
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@item neighbor
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Select nearest neighbor rescaling algorithm.
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@item area
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Select averaging area rescaling algorithm.
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@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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@item gauss
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Select Gaussian rescaling algorithm.
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@item sinc
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Select sinc rescaling algorithm.
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@item lanczos
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Select Lanczos rescaling algorithm. The default width (alpha) is 3 and can be
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changed by setting @code{param0}.
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@item spline
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Select natural bicubic spline rescaling algorithm.
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@item print_info
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Enable printing/debug logging.
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@item accurate_rnd
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Enable accurate rounding.
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@item full_chroma_int
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Enable full chroma interpolation.
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@item full_chroma_inp
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Select full chroma input.
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@item bitexact
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Enable bitexact output.
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@item unstable
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Allow the use of experimental new code. May subtly affect the output or even
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produce wrong results. For testing only.
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@end table
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@item srcw @var{(API only)}
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Set source width.
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@item srch @var{(API only)}
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Set source height.
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@item dstw @var{(API only)}
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Set destination width.
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@item dsth @var{(API only)}
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Set destination height.
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@item src_format @var{(API only)}
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Set source pixel format (must be expressed as an integer).
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@item dst_format @var{(API only)}
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Set destination pixel format (must be expressed as an integer).
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@item src_range @var{(boolean)}
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If value is set to @code{1}, indicates source is full range. Default value is
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@code{0}, which indicates source is limited range.
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@item dst_range @var{(boolean)}
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If value is set to @code{1}, enable full range for destination. Default value
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is @code{0}, which enables limited range.
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@item gamma @var{(boolean)}
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If value is set to @code{1}, enable gamma correct scaling. Default value is @code{0}.
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@anchor{sws_params}
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@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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@item sws_dither
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Set the dithering algorithm. Accepts one of the following
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values. Default value is @samp{auto}.
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@table @samp
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@item auto
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automatic choice
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@item none
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no dithering
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@item bayer
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bayer dither
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@item ed
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error diffusion dither
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@item a_dither
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arithmetic dither, based using addition
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@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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@end table
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@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 @samp{none}.
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@table @samp
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@item uniform_color
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Blend onto a uniform background color
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@item checkerboard
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Blend onto a checkerboard
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@item none
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No blending
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@end table
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@end table
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@c man end SCALER OPTIONS
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