diff options
Diffstat (limited to 'DOCS/man/en')
| -rw-r--r-- | DOCS/man/en/vo.rst | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/DOCS/man/en/vo.rst b/DOCS/man/en/vo.rst index f7346a55f5..6248073944 100644 --- a/DOCS/man/en/vo.rst +++ b/DOCS/man/en/vo.rst @@ -239,7 +239,8 @@ opengl Requires at least OpenGL 2.1 and the GL_ARB_texture_rg extension. For older drivers, ``opengl-old`` may work. - Some features are available with OpenGL 3 capable graphics drivers only. + Some features are available with OpenGL 3 capable graphics drivers only + (or if the necessary extensions are available). lscale=<filter> Set the scaling filter. Possible choices: @@ -270,10 +271,11 @@ opengl bilinear Bilinear hardware texture filtering (fastest, mid-quality). + This is the default. lanczos2 - Lanczos scaling with radius=2. Provides a good quality and speed. - This is the default. + Lanczos scaling with radius=2. Provides good quality and speed. + This is the default when using ``opengl-hq``. lanczos3 Lanczos with radius=3. @@ -322,9 +324,10 @@ opengl Enable gamma-correct scaling by working in linear light. This makes use of sRGB textures and framebuffers. This option forces the options 'indirect' and 'gamma'. - NOTE: for BT.709 colorspaces, a gamma of 2.35 is assumed. For - other YUV colorspaces, 2.2 is assumed. RGB input is always + NOTE: for YUV colorspaces, gamma 2.2 is assumed. RGB input is always assumed to be in sRGB. + This option is not really useful, as gamma-correct scaling has not much + influence on typical video playback. pbo Enable use of PBOs. This is faster, but can sometimes lead to @@ -406,9 +409,12 @@ opengl is used only on YUV conversion, and only if the video uses chroma-subsampling. This mechanism is disabled on RGB input. + Specifying this option directly is generally useful for debugging only. fbo-format=<fmt> - Selects the internal format of any FBO textures used. + Selects the internal format of textures used for FBOs. The format can + influence performance and quality of the video output. (FBOs are not + always used, and typically only when using extended scalers.) fmt can be one of: rgb, rgba, rgb8, rgb10, rgb16, rgb16f, rgb32f Default: rgb. @@ -424,7 +430,7 @@ opengl this file. This can be used to speed up loading, since LittleCMS2 can take a while to create the 3D LUT. Note that this file contains an uncompressed LUT. Its size depends on - the ``3dlut-size``, can become very big. + the ``3dlut-size``, and can be very big. icc-intent=<value> 0 @@ -451,6 +457,12 @@ opengl-hq Note that some cheaper LCDs do dithering that gravely interferes with vo_opengl's dithering. Disabling dithering with ``dither-depth=-1`` helps. + Unlike ``opengl``, ``opengl-hq`` makes use of FBOs by default. Sometimes you + can achieve better quality or performance by changing the fbo-format + sub-option to ``rgb16f``, ``rgb32f`` or ``rgb``. (Known problems include + Mesa/Intel not accepting ``rgb16``, Mesa sometimes not being compiled with + float texture support, and some OSX setups being very slow with ``rgb16``, + but fast with ``rgb32f``.) opengl-old OpenGL video output driver, old version. Video size must be smaller |