FFMPEG-SCALER(1)                                              FFMPEG-SCALER(1)


NAME
       ffmpeg-scaler - FFmpeg video scaling and pixel format converter

DESCRIPTION
       The FFmpeg rescaler provides a high-level interface to the libswscale
       library image conversion utilities. In particular it allows one to
       perform image rescaling and pixel format conversion.

SCALER OPTIONS
       The video scaler supports the following named options.

       Options may be set by specifying -option value in the FFmpeg tools,
       with a few API-only exceptions noted below.  For programmatic use, they
       can be set explicitly in the "SwsContext" options or through the
       libavutil/opt.h API.

       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 bicubic.

           It accepts the following values:

           fast_bilinear
               Select fast bilinear scaling algorithm.

           bilinear
               Select bilinear scaling algorithm.

           bicubic
               Select bicubic scaling algorithm.

           experimental
               Select experimental scaling algorithm.

           neighbor
               Select nearest neighbor rescaling algorithm.

           area
               Select averaging area rescaling algorithm.

           bicublin
               Select bicubic scaling algorithm for the luma component,
               bilinear for chroma components.

           gauss
               Select Gaussian rescaling algorithm.

           sinc
               Select sinc rescaling algorithm.

           lanczos
               Select Lanczos rescaling algorithm. The default width (alpha)
               is 3 and can be changed by setting "param0".

           spline
               Select natural bicubic spline rescaling algorithm.

           print_info
               Enable printing/debug logging.

           accurate_rnd
               Enable accurate rounding.

           full_chroma_int
               Enable full chroma interpolation.

           full_chroma_inp
               Select full chroma input.

           bitexact
               Enable bitexact output.

       srcw (API only)
           Set source width.

       srch (API only)
           Set source height.

       dstw (API only)
           Set destination width.

       dsth (API only)
           Set destination height.

       src_format (API only)
           Set source pixel format (must be expressed as an integer).

       dst_format (API only)
           Set destination pixel format (must be expressed as an integer).

       src_range (boolean)
           If value is set to 1, indicates source is full range. Default value
           is 0, which indicates source is limited range.

       dst_range (boolean)
           If value is set to 1, enable full range for destination. Default
           value is 0, which enables limited range.

       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.

       sws_dither
           Set the dithering algorithm. Accepts one of the following values.
           Default value is auto.

           auto
               automatic choice

           none
               no dithering

           bayer
               bayer dither

           ed  error diffusion dither

           a_dither
               arithmetic dither, based using addition

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

       alphablend
           Set the alpha blending to use when the input has alpha but the
           output does not.  Default value is none.

           uniform_color
               Blend onto a uniform background color

           checkerboard
               Blend onto a checkerboard

           none
               No blending

SEE ALSO
       ffmpeg(1), ffplay(1), ffprobe(1), libswscale(3)

AUTHORS
       The FFmpeg developers.

       For details about the authorship, see the Git history of the project
       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
       the FFmpeg source directory, or browsing the online repository at
       <https://git.ffmpeg.org/ffmpeg>.

       Maintainers for the specific components are listed in the file
       MAINTAINERS in the source code tree.

                                                              FFMPEG-SCALER(1)