Avid DNxHD
Avid DNxHD ("Digital Nonlinear Extensible High Definition") is a
Overview
DNxHD is a video codec intended to be usable as both an intermediate format suitable for use while editing and as a presentation format. DNxHD data is typically stored in an MXF container, although it can also be stored in a QuickTime container.
On February 13, 2008, Avid reported that DNxHD was approved as compliant with the SMPTE VC-3 standard.[2]
DNxHD is intended to be an open standard, but as of March 2008, has remained effectively a proprietary Avid format. The source code for the Avid DNxHD codec is freely available from Avid for internal evaluation and review, although commercial use requires Avid licensing approval. It has been commercially licensed to a number of companies including Ikegami, FilmLight, Harris Corporation, JVC, Seachange, EVS Broadcast Equipment.[3]
On September 14, 2014, at the Avid Connect event in Amsterdam, Netherlands, Avid announced the DNxHR codec to support resolutions greater than 1080p, such as 2K and 4K.[4]
On December 22, 2014, Avid Technology released an update for Media Composer that added support for 4K resolution, the Rec. 2020 color space, and a bit rate of up to 3,730 Mbit/s with the DNxHR codec.[5][6]
Implementations
DNxHD was first supported in
A standalone QuickTime codec for both
Since September 2007, the
to use DNxHD.At the April 2012 NAB show, Brevity introduced a customized algorithm for the accelerated transport and encoding of DNxHD files.[11]
Technical details
DNxHD is very similar to JPEG. Every frame is independent and consists of VLC-coded DCT coefficients.
The header consists of many parts and may include quantization tables and 2048 bits of user data. Each frame also has two
The codec supports alpha channel information.
VC-3
The DNxHD codec was submitted to the SMPTE organization as the framework for the VC-3 family of standards. It was approved as SMPTE VC-3 after a two-year testing and validation process in 2008 and 2009:[1][2][12][13]
- SMPTE 2019-1-2008 VC-3 Picture Compression and Data Stream Format
- SMPTE 2019-3-2008 VC-3 Type Data Stream Mapping Over SDTI
- SMPTE 2019-4-2009 Mapping VC-3 Coding Units into the MXF Generic Container
- RP (Recommended Practices) 2019-2-2009 VC-3 Decoder and Bitstream Conformance
References
- ^ a b Avid Technology, Inc. (2008-02-13). "Avid DNxHD is First Codec Compliant with SMPTE VC-3". Archived from the original on 2012-08-04. Retrieved 2010-08-19.
- ^ a b "Avid DNxHD is First Codec Compliant with SMPTE VC-3". Archived from the original on 2008-02-15. Retrieved 2008-02-13.
- ^ "Avid DNxHD Licensees". Archived from the original on August 7, 2008. Retrieved 2008-08-25.
- ^ "Avid Introduces DNxHR Codec for 2K, 4K, and UHD Editing". Archived from the original on 6 November 2014. Retrieved 6 November 2014.
- ^ Wim Van den Broeck (2014-12-22). "Editing 4K and Beyond in Media Composer Now Available with Avid Resolution Independence Update". Avid Technology. Retrieved 2014-12-23.
- ^ Bryant Frazer (2014-12-22). "Starting Today, You Can Finally Edit 4K Natively in the Avid". studiodaily. Archived from the original on 2014-12-23. Retrieved 2014-12-23.
- ^ Design, Blackmagic. "HyperDeck Shuttle - Blackmagic Design". blackmagic-design.com.
- ^ "Commit message for dnxhd 10-bit support in FFmpeg git repository". Retrieved 2013-01-21.
- ^ FFmpeg version 0.5[permanent dead link], Retrieved on 2009-08-09
- ^ FFmpeg General documentation - Video codecs, Retrieved on 2009-08-09
- ^ "NAB 2012: Brevity Emerges From Stealth Mode". Sports Video Group. 2012-04-16. Retrieved 2012-05-14.
- ^ SMPTE, Standards development and the SMPTE role (PDF), archived from the original (PDF) on 2011-06-09, retrieved 2010-08-18
- ^ "Numerical SMPTE Standards List". Retrieved 2010-08-18.