scaler.texi 2.42 KB
Newer Older
1
@anchor{scaler_options}
2 3 4 5 6 7 8 9 10 11 12
@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

13
@anchor{sws_flags}
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
@item sws_flags
Set the scaler flags. This is also used to set the scaling
algorithm. Only a single algorithm should be selected.

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.

38
@item bicublin
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
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.

@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.

99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
@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
115 116 117 118 119 120 121 122

@item a_dither
arithmetic dither, based using addition

@item x_dither
arithmetic dither, based using xor (more random/less apparent patterning that
a_dither).

123 124
@end table

125 126 127
@end table

@c man end SCALER OPTIONS