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diff --git a/DOCS/man/vf.rst b/DOCS/man/vf.rst index 984bdda656..0e944f110e 100644 --- a/DOCS/man/vf.rst +++ b/DOCS/man/vf.rst @@ -211,6 +211,97 @@ Available filters are: ``<outfmt>`` Format name that should be substituted for the output. If they do not have the same bytes per pixel and chroma subsamplimg, it will fail. + ``<colormatrix>`` + Controls the YUV to RGB color space conversion when playing video. There + are various standards. Normally, BT.601 should be used for SD video, and + BT.709 for HD video. (This is done by default.) Using incorrect color space + results in slightly under or over saturated and shifted colors. + + These options are not always supported. Different video outputs provide + varying degrees of support. The ``opengl`` and ``vdpau`` video output + drivers usually offer full support. The ``xv`` output can set the color + space if the system video driver supports it, but not input and output + levels. The ``scale`` video filter can configure color space and input + levels, but only if the output format is RGB (if the video output driver + supports RGB output, you can force this with ``-vf scale,format=rgba``). + + If this option is set to ``auto`` (which is the default), the video's + color space flag will be used. If that flag is unset, the color space + will be selected automatically. This is done using a simple heuristic that + attempts to distinguish SD and HD video. If the video is larger than + 1279x576 pixels, BT.709 (HD) will be used; otherwise BT.601 (SD) is + selected. + + Available color spaces are: + + :auto: automatic selection (default) + :bt.601: ITU-R BT.601 (SD) + :bt.709: ITU-R BT.709 (HD) + :bt.2020-ncl: ITU-R BT.2020 non-constant luminance system + :bt.2020-cl: ITU-R BT.2020 constant luminance system + :smpte-240m: SMPTE-240M + + ``<colorlevels>`` + YUV color levels used with YUV to RGB conversion. This option is only + necessary when playing broken files which do not follow standard color + levels or which are flagged wrong. If the video does not specify its + color range, it is assumed to be limited range. + + The same limitations as with ``<colormatrix>`` apply. + + Available color ranges are: + + :auto: automatic selection (normally limited range) (default) + :limited: limited range (16-235 for luma, 16-240 for chroma) + :full: full range (0-255 for both luma and chroma) + + ``<outputlevels>`` + RGB color levels used with YUV to RGB conversion. Normally, output devices + such as PC monitors use full range color levels. However, some TVs and + video monitors expect studio RGB levels. Providing full range output to a + device expecting studio level input results in crushed blacks and whites, + the reverse in dim gray blacks and dim whites. + + The same limitations as with ``<colormatrix>`` apply. + + Available color ranges are: + + :auto: automatic selection (equals to full range) (default) + :limited: limited range (16-235 per component), studio levels + :full: full range (0-255 per component), PC levels + + .. note:: + + It is advisable to use your graphics driver's color range option + instead, if available. + + ``<primaries>`` + RGB primaries the source file was encoded with. Normally this should be set + in the file header, but when playing broken or mistagged files this can be + used to override the setting. By default, when unset, BT.709 is used for + all files except those tagged with a BT.2020 color matrix. + + This option only affects video output drivers that perform color + management, for example ``opengl`` with the ``srgb`` or ``icc-profile`` + suboptions set. + + If this option is set to ``auto`` (which is the default), the video's + primaries flag will be used. If that flag is unset, the color space will + be selected automatically, using the following heuristics: If the + ``<colormatrix>`` is set or determined as BT.2020 or BT.709, the + corresponding primaries are used. Otherwise, if the video height is + exactly 576 (PAL), BT.601-625 is used. If it's exactly 480 or 486 (NTSC), + BT.601-525 is used. If the video resolution is anything else, BT.709 is + used. + + Available primaries are: + + :auto: automatic selection (default) + :bt.601-525: ITU-R BT.601 (SD) 525-line systems (NTSC, SMPTE-C) + :bt.601-625: ITU-R BT.601 (SD) 625-line systems (PAL, SECAM) + :bt.709: ITU-R BT.709 (HD) (same primaries as sRGB) + :bt.2020: ITU-R BT.2020 (UHD) + ``noformat[=fmt]`` Restricts the color space for the next filter without doing any conversion. |