Description
***********

The FFmpeg rescaler provides an high-level interface to the libswscale library image conversion utilities. In particular it allows 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. 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.

     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.

     bicubiclin
          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.

     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
     Set source width.

srch
     Set source height.

dstw
     Set destination width.

dsth
     Set destination height.

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

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

src_range
     Select source range.

dst_range
     Select destination 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.