1FFMPEG-SCALER(1) FFMPEG-SCALER(1)
2
6 ffmpeg-scaler - FFmpeg video scaling and pixel format converter
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9 The FFmpeg rescaler provides a high-level interface to the libswscale
10 library image conversion utilities. In particular it allows one to
11 perform image rescaling and pixel format conversion.
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14 The video scaler supports the following named options.
15 Options may be set by specifying -option value in the FFmpeg tools,
17 with a few API-only exceptions noted below. For programmatic use, they
18 can be set explicitly in the "SwsContext" options or through the
19 libavutil/opt.h API.
20 sws_flags
22 Set the scaler flags. This is also used to set the scaling
23 algorithm. Only a single algorithm should be selected. Default
24 value is bicubic.
25 It accepts the following values:
27 fast_bilinear
29 Select fast bilinear scaling algorithm.
30 bilinear
32 Select bilinear scaling algorithm.
33 bicubic
35 Select bicubic scaling algorithm.
36 experimental
38 Select experimental scaling algorithm.
39 neighbor
41 Select nearest neighbor rescaling algorithm.
42 area
44 Select averaging area rescaling algorithm.
45 bicublin
47 Select bicubic scaling algorithm for the luma component,
48 bilinear for chroma components.
49 gauss
51 Select Gaussian rescaling algorithm.
52 sinc
54 Select sinc rescaling algorithm.
55 lanczos
57 Select Lanczos rescaling algorithm. The default width (alpha)
58 is 3 and can be changed by setting "param0".
59 spline
61 Select natural bicubic spline rescaling algorithm.
62 print_info
64 Enable printing/debug logging.
65 accurate_rnd
67 Enable accurate rounding.
68 full_chroma_int
70 Enable full chroma interpolation.
71 full_chroma_inp
73 Select full chroma input.
74 bitexact
76 Enable bitexact output.
77 srcw (API only)
79 Set source width.
80 srch (API only)
82 Set source height.
83 dstw (API only)
85 Set destination width.
86 dsth (API only)
88 Set destination height.
89 src_format (API only)
91 Set source pixel format (must be expressed as an integer).
92 dst_format (API only)
94 Set destination pixel format (must be expressed as an integer).
95 src_range (boolean)
97 If value is set to 1, indicates source is full range. Default value
98 is 0, which indicates source is limited range.
99 dst_range (boolean)
101 If value is set to 1, enable full range for destination. Default
102 value is 0, which enables limited range.
103 param0, param1
105 Set scaling algorithm parameters. The specified values are specific
106 of some scaling algorithms and ignored by others. The specified
107 values are floating point number values.
108 sws_dither
110 Set the dithering algorithm. Accepts one of the following values.
111 Default value is auto.
112 auto
114 automatic choice
115 none
117 no dithering
118 bayer
120 bayer dither
121 ed error diffusion dither
123 a_dither
125 arithmetic dither, based using addition
126 x_dither
128 arithmetic dither, based using xor (more random/less apparent
129 patterning that a_dither).
130 alphablend
132 Set the alpha blending to use when the input has alpha but the
133 output does not. Default value is none.
134 uniform_color
136 Blend onto a uniform background color
137 checkerboard
139 Blend onto a checkerboard
140 none
142 No blending
143
145 ffmpeg(1), ffplay(1), ffprobe(1), libswscale(3)
146
148 The FFmpeg developers.
149 For details about the authorship, see the Git history of the project
151 (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
152 the FFmpeg source directory, or browsing the online repository at
153 <https://git.ffmpeg.org/ffmpeg>.
154 Maintainers for the specific components are listed in the file
156 MAINTAINERS in the source code tree.
157 FFMPEG-SCALER(1)