DNxHD codec
DNxHD ( Digital Nonlinear Extensible High Definition) is a standard developed by Avid lossy video codec. The field of application of DNxHD is the video editing in post-production ( Intermediate Codec ), the Ikegami camera uses the codec as the original format. A DNxHD stream is typically packaged in a MXF containers, but may also be coated by another container formats. DNxHD is the basis of the SMPTE VC Specification 3rd The Institute for Broadcasting Technology (IRT ) has the DNxHD codec admitted among other codecs ( AVC -Intra, ProRes, HDCAM SR ) for use in high-resolution quality productions of ARD, ZDF, ORF and SRG and certifies him even at low data rates good multi-generation capabilities.
Technical structure
Technically DNxHD is an intra -frame video codec ( see also Motion JPEG) established, in which each frame is encoded independently of its neighboring images. Thereby, the complexity of the video codec to be kept low, but at the expense of a low data rate as possible. Each image has a time stamp and a unique ID. DNxHD uses a 4:2:2 color subsampling and support an alpha channel.
Formats
The following resolutions and data rates are offered for PAL.
With 1280x720 resolution, there is no 24fps mode, only 23.976fps.
Products
The source code of DNxHD can be viewed and used freely, a commercial implementation, however, is subject to license. A QuickTime Plugin allows Avid DNxHD encoding and decoding on Windows and Apple platforms. The open source project FFmpeg DNxHD support since version 0.5, which can be DNxHD with 8 bit color depth also decodes on Linux platforms and encoded; Since July 2011, the color depth is supported by 10 bit.
In addition to Avid DNxHD support other manufacturers:
- Ikegami HD camera Editcam
- Digital video recorder from Cinedeck and OpenCubeTech and Blackmagic Design HyperDeck Shuttle 2
- Graphics card from Matrox
- The integrated circuit of Nethra
HD intra frame video codec
ProRes, an HD intra frame video codec from Apple for video editing in post-production.
AVC- Intra, an HD intra frame video codec from Panasonic for recording devices, but also for video editing.
Motion JPEG 2000, one based on JPEG 2000 HD intra frame video codec. Use in digital cinema.