RP 2042-3:2010 – VC-2 Conformance Specification.

SMPTE 2047-2:2010 Carriage of VC-2 Compressed Video over HD-SDI.RP (Recommended Practices) 09 – VC-2 Mezzanine Level Compression of 1080P High Definition Video Sources.In 2010, the SMPTE standardised Dirac Pro as VC-2.

The Dirac Pro specification defines an I-frame only subset of the main Dirac Specification, aimed for professional and studio use in high bitrate applications. VC-2 ĭirac Pro was proposed to the SMPTE for standardisation. ĭirac can be used in AVI, Ogg and Matroska container formats and is also registered for use in the MPEG-4 file format and MPEG-2 transport streams. Two of the specific wavelets Dirac can use are nearly identical to JPEG 2000's (known as the 5/3 and 9/7 wavelets), as well as two more derived from them. ĭirac employs wavelet compression, like the JPEG 2000 and PGF image formats and the Cineform professional video codec, instead of the discrete cosine transforms used in MPEG compression formats. Dirac supports lossy and lossless compression modes. When the low delay syntax is used, the bit rate will be constant for each area (Dirac slice) in a picture to ensure constant latency. Dirac's implementers make the preliminary claim of ' a two-fold reduction in bit rate over MPEG-2 for high definition video', which makes it comparable to standards such as H.264/MPEG-4 AVC and VC-1.ĭirac supports both constant bit rate and variable bit rate operation. The format implementations are named in honour of the theoretical physicists Paul Dirac and Erwin Schrödinger, who shared the 1933 Nobel Prize in physics.ĭirac supports resolutions of HDTV (1920×1080) and greater, and is claimed to provide significant savings in data rate and improvements in quality over video compression formats such as MPEG-2 Part 2, MPEG-4 Part 2 and its competitors, e.g. Dirac Pro was used internally by the BBC to transmit HDTV pictures at the Beijing Olympics in 2008. Version 2.2.3 of the full Dirac specification, including motion compensation and inter-frame coding, was issued a few days later. In September of that year, version 1.0.0 of an I-frame only subset known as Dirac Pro was released and has since been standardised by the SMPTE as VC-2. The specification was finalised in January 2008, and further developments are only bug fixes and constraints. Dirac format aims to provide high-quality video compression for Ultra HDTV and beyond, and as such competes with existing formats such as H.264 and VC-1.

Schrödinger and dirac-research (formerly just called 'Dirac') are open and royalty-free software implementations ( video codecs) of Dirac. MPEG-TS, Ogg, AVI, MKV, MOV, MPEG-4 Part 12, etc.ĭirac is an open and royalty-free video compression format, specification and system developed by BBC Research & Development.

Dirac live 1.0 free