The Dirac_Video Codec
Dirac is an open source video codec. It uses a traditional hybrid video
codec architecture, but with the wavelet transform instead of the usual
block transforms. Motion compensation uses overlapped blocks to reduce
block artefacts that would upset the transform coding stage.
Dirac can code just about any size of video, from streaming up to HD
and beyond, although certain presets are defined for different
applications and standards. These cover the parameters that need to be
set for the encoder to work, such as block sizes and temporal
prediction structures, which must otherwise be set by hand.
Dirac is intended to develop into real coding and decoding software,
capable of plugging into video processing applications and media
players that need compression. It is intended to develop into a simple
set of reliable but effective coding tools that work over a wide
variety of content and formats, using well-understood compression
techniques, in a clear and accessible software structure. It is not
intended as a demonstration or reference coder.
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