890320b1c0
Default is "bicubic". Signed-off-by: Lou Logan <lou@lrcd.com> Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
146 lines
2.7 KiB
Plaintext
146 lines
2.7 KiB
Plaintext
@anchor{scaler_options}
|
|
@chapter Scaler Options
|
|
@c man begin SCALER OPTIONS
|
|
|
|
The video scaler supports the following named options.
|
|
|
|
Options may be set by specifying -@var{option} @var{value} in the
|
|
FFmpeg tools. For programmatic use, they can be set explicitly in the
|
|
@code{SwsContext} options or through the @file{libavutil/opt.h} API.
|
|
|
|
@table @option
|
|
|
|
@anchor{sws_flags}
|
|
@item sws_flags
|
|
Set the scaler flags. This is also used to set the scaling
|
|
algorithm. Only a single algorithm should be selected. Default
|
|
value is @samp{bicubic}.
|
|
|
|
It accepts the following values:
|
|
@table @samp
|
|
@item fast_bilinear
|
|
Select fast bilinear scaling algorithm.
|
|
|
|
@item bilinear
|
|
Select bilinear scaling algorithm.
|
|
|
|
@item bicubic
|
|
Select bicubic scaling algorithm.
|
|
|
|
@item experimental
|
|
Select experimental scaling algorithm.
|
|
|
|
@item neighbor
|
|
Select nearest neighbor rescaling algorithm.
|
|
|
|
@item area
|
|
Select averaging area rescaling algorithm.
|
|
|
|
@item bicublin
|
|
Select bicubic scaling algorithm for the luma component, bilinear for
|
|
chroma components.
|
|
|
|
@item gauss
|
|
Select Gaussian rescaling algorithm.
|
|
|
|
@item sinc
|
|
Select sinc rescaling algorithm.
|
|
|
|
@item lanczos
|
|
Select Lanczos rescaling algorithm.
|
|
|
|
@item spline
|
|
Select natural bicubic spline rescaling algorithm.
|
|
|
|
@item print_info
|
|
Enable printing/debug logging.
|
|
|
|
@item accurate_rnd
|
|
Enable accurate rounding.
|
|
|
|
@item full_chroma_int
|
|
Enable full chroma interpolation.
|
|
|
|
@item full_chroma_inp
|
|
Select full chroma input.
|
|
|
|
@item bitexact
|
|
Enable bitexact output.
|
|
@end table
|
|
|
|
@item srcw
|
|
Set source width.
|
|
|
|
@item srch
|
|
Set source height.
|
|
|
|
@item dstw
|
|
Set destination width.
|
|
|
|
@item dsth
|
|
Set destination height.
|
|
|
|
@item src_format
|
|
Set source pixel format (must be expressed as an integer).
|
|
|
|
@item dst_format
|
|
Set destination pixel format (must be expressed as an integer).
|
|
|
|
@item src_range
|
|
Select source range.
|
|
|
|
@item dst_range
|
|
Select destination range.
|
|
|
|
@anchor{sws_params}
|
|
@item param0, param1
|
|
Set scaling algorithm parameters. The specified values are specific of
|
|
some scaling algorithms and ignored by others. The specified values
|
|
are floating point number values.
|
|
|
|
@item sws_dither
|
|
Set the dithering algorithm. Accepts one of the following
|
|
values. Default value is @samp{auto}.
|
|
|
|
@table @samp
|
|
@item auto
|
|
automatic choice
|
|
|
|
@item none
|
|
no dithering
|
|
|
|
@item bayer
|
|
bayer dither
|
|
|
|
@item ed
|
|
error diffusion dither
|
|
|
|
@item a_dither
|
|
arithmetic dither, based using addition
|
|
|
|
@item x_dither
|
|
arithmetic dither, based using xor (more random/less apparent patterning that
|
|
a_dither).
|
|
|
|
@end table
|
|
|
|
@item alphablend
|
|
Set the alpha blending to use when the input has alpha but the output does not.
|
|
Default value is @samp{none}.
|
|
|
|
@table @samp
|
|
@item uniform_color
|
|
Blend onto a uniform background color
|
|
|
|
@item checkerboard
|
|
Blend onto a checkerboard
|
|
|
|
@item none
|
|
No blending
|
|
|
|
@end table
|
|
|
|
@end table
|
|
|
|
@c man end SCALER OPTIONS
|