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authorwm4 <wm4@nowhere>2013-06-08 02:15:24 +0200
committerwm4 <wm4@nowhere>2013-06-28 21:20:41 +0200
commitac266da6588f25a449a739f7a6a3d2c69ca80e19 (patch)
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vo_opengl: handle chroma location
Use the video decoder chroma location flags and render chroma locations other than centered. Until now, we've always used the intuitive and obvious centered chroma location, but H.264 uses something else. FFmpeg provides a small overview in libavcodec/avcodec.h: ----------- /** * X X 3 4 X X are luma samples, * 1 2 1-6 are possible chroma positions * X X 5 6 X 0 is undefined/unknown position */ enum AVChromaLocation{ AVCHROMA_LOC_UNSPECIFIED = 0, AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263 AVCHROMA_LOC_TOPLEFT = 3, ///< DV AVCHROMA_LOC_TOP = 4, AVCHROMA_LOC_BOTTOMLEFT = 5, AVCHROMA_LOC_BOTTOM = 6, AVCHROMA_LOC_NB , ///< Not part of ABI }; ----------- The visual difference is literally minimal, but since videophiles apparently consider this detail as quality mark of a video renderer, support it anyway. We don't bother with chroma locations other than centered and left, though. Not sure about correctness, but it's probably ok.
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diff --git a/DOCS/man/en/vo.rst b/DOCS/man/en/vo.rst
index 079e146f8a..3b2c280724 100644
--- a/DOCS/man/en/vo.rst
+++ b/DOCS/man/en/vo.rst
@@ -465,6 +465,10 @@ opengl
that when using FBO indirections (such as with ``opengl-hq``), a FBO
format with alpha must be specified with the ``fbo-format`` option.
+ chroma-location=<auto|center|left>
+ Set the YUV chroma sample location. auto means use the bitstream
+ flags (default: auto).
+
opengl-hq
Same as ``opengl``, but with default settings for high quality rendering.