mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
149 lines
3.2 KiB
149 lines
3.2 KiB
@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, with a few API-only exceptions noted below. |
|
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. The default width (alpha) is 3 and can be |
|
changed by setting @code{param0}. |
|
|
|
@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 @var{(API only)} |
|
Set source width. |
|
|
|
@item srch @var{(API only)} |
|
Set source height. |
|
|
|
@item dstw @var{(API only)} |
|
Set destination width. |
|
|
|
@item dsth @var{(API only)} |
|
Set destination height. |
|
|
|
@item src_format @var{(API only)} |
|
Set source pixel format (must be expressed as an integer). |
|
|
|
@item dst_format @var{(API only)} |
|
Set destination pixel format (must be expressed as an integer). |
|
|
|
@item src_range @var{(boolean)} |
|
If value is set to @code{1}, indicates source is full range. Default value is |
|
@code{0}, which indicates source is limited range. |
|
|
|
@item dst_range @var{(boolean)} |
|
If value is set to @code{1}, enable full range for destination. Default value |
|
is @code{0}, which enables limited 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
|
|
|