View source for Documentation:Modules/dirac

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The dirac demuxer will be removed. It has already been {{Commitdiff|eb8ab8df4b1483e1cc299d96b5c43b738ee03d25|l=removed}} in 4.0.0-dev.

== Demux ==
{{Module|name=dirac|type=Access demux|first_version=1.0.0|description=[[Dirac]] video demuxer|sc=dirac}}

=== Options ===
{{Option
|name=dirac-dts-offset
|value=integer
|default=0
|description=Value to adjust dts by
}}
{{Clear}}

== Mux ==
{{Module|name=dirac|type=Muxer|first_version=0.8.2|last_version=2.1.6|description=[[Dirac]] video encoder using [https://sourceforge.net/projects/dirac/files/dirac-codec/ dirac-research library]|sc=none}}

A few notes (of no real importance as this is a removed module):
* the option <code>--sout-dirac-cpd</code> is, unusually, a float with an integer range
* the option <code>--sout-dirac-me-combined</code> is [[wikipedia:Conditional compilation|dependent]] on Dirac research version of at least 1.0.1
* the options <code>--sout-dirac-multi-quant</code> and <code>--sout-dirac-spartition</code> are disabled when set to <code>-1</code>. They have a code comment:
*: /* NB, unforunately vlc doesn't have a concept of 'don't care' */
* the options <code>--sout-dirac-mc-blk-xblen</code> and <code>--sout-dirac-mc-blk-yblen</code> were originally aliases for <code>--sout-dirac-mc-blk-width</code> and <code>--sout-dirac-mc-blk-height</code> prior to 1.0.0

=== Options ===
{{Option
|name=sout-dirac-quality
|value=float
|default=5.5
|min=0.
|max=10.
|description=If [[bitrate]]=0, use this value for constant quality
}}
{{Option
|name=sout-dirac-bitrate
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=A value > 0 (in kbps) enables constant bitrate mode
}}
{{Option
|name=sout-dirac-lossless
|value=boolean
|default=disabled
|description=[[Lossless]] coding ignores bitrate and quality settings, allowing for perfect reproduction of the original
}}
{{Option
|name=sout-dirac-prefilter
|value=string
|select={none,cwm,rectlp,diaglp}
|default=diaglp
|description=Enable adaptive prefiltering: The options correspond to "none", "Centre Weighted Median", "Rectangular Linear Phase", "Diagonal Linear Phase"
}}
{{Option
|name=sout-dirac-prefilter-strength
|value=integer
|default=1
|min=0
|max=10
|description=Higher value implies more prefiltering
}}
{{Option
|name=sout-dirac-chroma-fmt
|value=string
|select={420,422,444}
|default=420
|description=Picking [[chroma]] format will force a conversion of the video into that format: "[[4:2:0]]", "[[4:2:2]]" or "[[4:4:4]]"
}}
{{Option
|name=sout-dirac-l1-sep
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=Distance between ''[[P-frame]]s''
}}
{{Option
|name=sout-dirac-num-l1
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=Number of ''P-frames'' per GOP
}}
{{Option
|name=sout-dirac-coding-mode
|value=string
|select={auto,progressive,field}
|default=auto
|description=Field coding is where interlaced fields are coded seperately as opposed to a pseudo-progressive frame (auto - let encoder decide based upon input (Best), progressive - force coding frame as single picture, field - force coding frame as seperate interlaced fields)
}}
{{Option
|name=sout-dirac-mv-prec
|value=string
|select={1,1/2,1/4,1/8}
|default=1/2
|description=Motion vector precision in pels
}}
{{Option
|name=sout-dirac-mc-blk-width
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=Width of motion compensation blocks
}}
{{Option
|name=sout-dirac-mc-blk-height
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=Height of motion compensation blocks
}}
{{Option
|name=sout-dirac-mc-blk-overlap
|value=integer
|default=-1
|min=-1
|max=100
|description=Amount (%) that each motion block should be overlapped by its neighbours
}}
{{Option
|name=sout-dirac-me-simple-search
|value=string
|default=""
|description=(Not recommended) Perform a simple (non hierarchical block matching motion vector search with search range of +/-<var>x</var>, +/-<var>y</var>)
}}
{{Option
|name=sout-dirac-me-combined
|value=boolean
|default=enabled
|description=Use chroma as part of the motion estimation process
}}
{{Option
|name=sout-dirac-dwt-intra
|value=integer
|default=-1
|min=-1
|max=6
|description=Intra picture DWT filter
}}
{{Option
|name=sout-dirac-dwt-inter
|value=integer
|default=-1
|min=-1
|max=6
|description=Inter picture DWT filter
}}
{{Option
|name=sout-dirac-dwt-depth
|value=integer
|default=-1
|min=-1
|max=4
|description=Number of DWT iterations (Also known as DWT levels)
}}
{{Option
|name=sout-dirac-noac
|value=boolean
|default=disabled
|description=Disable arithmetic coding&mdash;Use variable length codes instead, useful for very high bitrates
}}

==== Advanced options ====
{{Option
|name=sout-dirac-mc-blk-xblen
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=Total horizontal block length including overlaps
}}
{{Option
|name=sout-dirac-mc-blk-yblen
|value=integer
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=Total vertical block length including overlaps
}}
{{Option
|name=sout-dirac-multi-quant
|value=integer
|default=-1
|min=-1
|max=1
|description=Enable multiple quantizers per subband (one per codeblock)
}}
{{Option
|name=sout-dirac-spartition
|value=integer
|default=-1
|min=-1
|max=1
|description=Enable spatial partitioning
}}
{{Option
|name=sout-dirac-cpd
|value=float
|default=-1
|min=-1
|max=<var>INT_MAX</var>
|description=cycles per degree
}}

== Source code ==
* {{VLCSourceFile|p=vlc/vlc-3.0.git|modules/demux/dirac.c}} (demux)
* {{VLCSourceFile|p=vlc/vlc-2.1.git|modules/codec/dirac.c}} (mux)

{{Documentation}}