| 1 | @anchor{scaler_options} |
| 2 | @chapter Scaler Options |
| 3 | @c man begin SCALER OPTIONS |
| 4 | |
| 5 | The video scaler supports the following named options. |
| 6 | |
| 7 | Options may be set by specifying -@var{option} @var{value} in the |
| 8 | FFmpeg tools. For programmatic use, they can be set explicitly in the |
| 9 | @code{SwsContext} options or through the @file{libavutil/opt.h} API. |
| 10 | |
| 11 | @table @option |
| 12 | |
| 13 | @anchor{sws_flags} |
| 14 | @item sws_flags |
| 15 | Set the scaler flags. This is also used to set the scaling |
| 16 | algorithm. Only a single algorithm should be selected. |
| 17 | |
| 18 | It accepts the following values: |
| 19 | @table @samp |
| 20 | @item fast_bilinear |
| 21 | Select fast bilinear scaling algorithm. |
| 22 | |
| 23 | @item bilinear |
| 24 | Select bilinear scaling algorithm. |
| 25 | |
| 26 | @item bicubic |
| 27 | Select bicubic scaling algorithm. |
| 28 | |
| 29 | @item experimental |
| 30 | Select experimental scaling algorithm. |
| 31 | |
| 32 | @item neighbor |
| 33 | Select nearest neighbor rescaling algorithm. |
| 34 | |
| 35 | @item area |
| 36 | Select averaging area rescaling algorithm. |
| 37 | |
| 38 | @item bicublin |
| 39 | Select bicubic scaling algorithm for the luma component, bilinear for |
| 40 | chroma components. |
| 41 | |
| 42 | @item gauss |
| 43 | Select Gaussian rescaling algorithm. |
| 44 | |
| 45 | @item sinc |
| 46 | Select sinc rescaling algorithm. |
| 47 | |
| 48 | @item lanczos |
| 49 | Select lanczos rescaling algorithm. |
| 50 | |
| 51 | @item spline |
| 52 | Select natural bicubic spline rescaling algorithm. |
| 53 | |
| 54 | @item print_info |
| 55 | Enable printing/debug logging. |
| 56 | |
| 57 | @item accurate_rnd |
| 58 | Enable accurate rounding. |
| 59 | |
| 60 | @item full_chroma_int |
| 61 | Enable full chroma interpolation. |
| 62 | |
| 63 | @item full_chroma_inp |
| 64 | Select full chroma input. |
| 65 | |
| 66 | @item bitexact |
| 67 | Enable bitexact output. |
| 68 | @end table |
| 69 | |
| 70 | @item srcw |
| 71 | Set source width. |
| 72 | |
| 73 | @item srch |
| 74 | Set source height. |
| 75 | |
| 76 | @item dstw |
| 77 | Set destination width. |
| 78 | |
| 79 | @item dsth |
| 80 | Set destination height. |
| 81 | |
| 82 | @item src_format |
| 83 | Set source pixel format (must be expressed as an integer). |
| 84 | |
| 85 | @item dst_format |
| 86 | Set destination pixel format (must be expressed as an integer). |
| 87 | |
| 88 | @item src_range |
| 89 | Select source range. |
| 90 | |
| 91 | @item dst_range |
| 92 | Select destination range. |
| 93 | |
| 94 | @item param0, param1 |
| 95 | Set scaling algorithm parameters. The specified values are specific of |
| 96 | some scaling algorithms and ignored by others. The specified values |
| 97 | are floating point number values. |
| 98 | |
| 99 | @item sws_dither |
| 100 | Set the dithering algorithm. Accepts one of the following |
| 101 | values. Default value is @samp{auto}. |
| 102 | |
| 103 | @table @samp |
| 104 | @item auto |
| 105 | automatic choice |
| 106 | |
| 107 | @item none |
| 108 | no dithering |
| 109 | |
| 110 | @item bayer |
| 111 | bayer dither |
| 112 | |
| 113 | @item ed |
| 114 | error diffusion dither |
| 115 | |
| 116 | @item a_dither |
| 117 | arithmetic dither, based using addition |
| 118 | |
| 119 | @item x_dither |
| 120 | arithmetic dither, based using xor (more random/less apparent patterning that |
| 121 | a_dither). |
| 122 | |
| 123 | @end table |
| 124 | |
| 125 | @end table |
| 126 | |
| 127 | @c man end SCALER OPTIONS |