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doc: Completely document the x264 options
And fix an option mismatch.
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@ -584,25 +584,39 @@ options follow the Libav ones.
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@item g @tab keyint
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@tab Maximum GOP size.
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@item qmin @tab qpmin
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@tab Minimum quantizer scale.
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@item qmax @tab qpmax
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@tab Maximum quantizer scale.
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@item qdiff @tab qpstep
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@tab Maximum difference between quantizer scales.
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@item qblur @tab qblur
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@tab Quantizer curve blur
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@item qcomp @tab qcomp
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@tab Quantizer curve compression factor
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@item refs @tab ref
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@tab Number of reference frames each P-frame can use. The range is from @var{0-16}.
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@item sc_threshold @tab scenecut
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@tab Sets the threshold for the scene change detection.
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@item trellis @tab trellis
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@tab Performs Trellis quantization to increase efficiency. Enabled by default.
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@item nr @tab nr
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@tab Noise reduction.
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@item me_range @tab merange
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@tab Maximum range of the motion search in pixels.
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@item me_method @tab me
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@tab Full-pixel motion estimation method.
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@item subq @tab subme
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@tab Sub-pixel motion estimation method.
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@item b_strategy @tab b-adapt
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@item keyint_min @tab keyint-min
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@tab Adaptive B-frame placement decision algorithm. Use only on first-pass.
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@item keyint_min @tab min-keyint
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@tab Minimum GOP size.
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@item coder @tab cabac
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@tab Set coder to @code{ac} to use CABAC.
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@item cmp @tab chroma-me
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@tab Set to @code{chroma} to use chroma motion estimation.
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@item threads @tab threads
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@tab Number of encoding threads.
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@item thread_type @tab sliced_threads
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@tab Set to @code{slice} to use sliced threading instead of frame threading.
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@item flags -cgop @tab open-gop
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