AVC-Intra
From Wikipedia, the free encyclopedia
AVC-Intra[1] is a fully compliant[2] H.264/MPEG-4 AVC codec implementation, with profiles and levels specified by Panasonic. AVC-Intra is available in a number of Panasonic's high definition broadcast products, such as, for example, their P2 card equipped broadcast cameras.[3]
AVC-Intra is an upcoming industry standard being defined in SMPTE commitee. Official document name is: Proposed SMPTE Recommended Practice for Television, SMPTE RP 2027, "AVC Intra-frame coding specification for SSM Card applications". Currently it is in a draft stage.
Panasonic has announced AVC-Intra codec support in April 2007. The use of AVC-Intra provides production quality HD video at bit rates more normally associated with ENG (Electronic news gathering) applications, permitting full resolution, 10 bit field capture of high quality HD imagery in one piece camera-recorders.
AVC-Intra is intended to serve needs of video professionals, who have to store HD digital video on digital storage media for editing and archiving purposes. It defines 10-bit intra-frame only compression, which is easy for editing and preserves maximum video quality. The new standard significantly outperforms the older HDV (MPEG2 based) and DVCPRO HD (DV based) formats, allowing the codec to maintain better quality in 2x less storage.
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[edit] Technical details
There are two classes;
- AVC-Intra 50:
- nominally 50 Mbit/s
- CABAC entropy coding only.
- 1920x1080 formats are High 10 Intra Profile, Level 4
- 1280x720 formats are High 10 Intra Profile, Level 3.2
- 4:2:0 chrominance sampling
- frames are horizontally scaled by 3/4 (1920x1080 is scaled to 1440x1080. 1280x720 is scaled to 960x720)
- AVC-Intra 100:
- nominally 100 Mbit/s
- CAVLC entropy coding only.
- All formats are High 4:2:2 Intra Profile, Level 4.1
- 4:2:2 chrominance sampling
- frames are not scaled
Common to both classes;
- Frame rates: 1920x1080 (23.98p / 25p / 29.97p / 50i / 59.94i), 1280x720 (23.98p / 25p / 29.97p / 50p / 59.94p)
- 10 bit luma and chroma
[edit] Third Party Support
- Apple's Final Cut Pro 6.0.2 provides support via the ProRes 4.2.2 codec[4]
- MainConcept offer an AVC-Intra encoder and decoder as part of their Codec SDK 7.1[5]
- Omneon Inc have announced AVC-Intra support for their Spectrum and MediaDeck products[6]
- Quantel demonstrated AVC-Intra workflow at NAB 2007[7]
- Thomson Grass Valley have announced native support for AVC-Intra in EDIUS 4.5[8]
[edit] References
- ^ AVC-Intra (H.264 Intra) Compression, Technical Overview. Retrieved on 2008-01-29.
- ^ AVC-Intra FAQ. Retrieved on 2008-01-29.
- ^ AJ-HPX2000 brochure. Retrieved on 2008-01-29.
- ^ Apple Announces AVC-Intra Support with Final Cut Pro 6.0.2 Update.
- ^ MainConcept Codec SDK components.
- ^ Omneon Server support for Panasonic's Advanced AVC-Intra HD format.
- ^ Quantel demonstrates AVC-Intra.
- ^ Thomson's Grass Valley Boosts EDIUS Capabilities and User Interface.
[edit] Codecs
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