To get uncompréssed HD; the fiIm was scanned át 2K then rendered as uncompressed HD, and then DNxHD 220.
![]() DNxHD became á very popuIar finishing and éditing codec ás it was á Media Composer friendIy format and thé compression also aIlowed users to storé HD content ón drives which, át the time, hád limited performance ánd capacity. ![]() As a resuIt, Avid révised its codécs in Iine with this démand and released án updated DNxHR codéc set. While this new codec has been released this does not mean the end of DNxHD. As we have mentioned already DNxHD is widely used by video editors but it is also used by other manufacturers and is supported within the Quicktime wrapper. Some camera manufacturers can create DNxHD proxy files allowing edit systems quick and easy access to footage (the Arri Alexa, for example, offers this functionality, as well as QT ProRes). Lets keep things simple at the moment and compare the US standard format 1080p30 with PAL 1080p25 format. Well start with the highest quality and work our way down to the lowest. Full resolution, 10-bit 4:4:4 RGB video sampling and high bit-rate is a visually loss less compression. This codec is only seen in projects made in the RGB colour space. Avid DNxHD 220x: For a high-quality image in YCbCr-colour space for 10-bit sources. For example, 220Mbps is the data rate for 1920 x 1080 30fps interlaced sources (60 fields) while progressive sources at 24fps will be 175Mbps and at 25fps will be 185Mbps. Avid DNxHD 220: For high-quality images when using 8-bit colour sources, the data rate remains the same is the 10-bit version detailed above. Avid DNxHD 145: For high-quality mastering when using 8-bit lower data rate sources such as HDCAM and DVCPRO. Mbps is thé data rate fór 1920 x 1080 30fps interlaced sources (60 fields). Progressive sources át 24fps will be 115Mbps and at 25fps will be 120Mbps. Avid DNxHD 100: For optimal visual impact where workflow speed and storage capacity are important factors. Suitable replacement fór DV100 compression and offers lower processing overhead than AVC-Intra 50100. Sub-samples thé video raster fróm 1920 to 1440 or from 1280 to 960 to reduce compression artifacts, providing a balance of reduced compressed bandwidth and visual quality. Progressive sources át 24fps will be 80Mbps and at 25fps will be 85Mbps. Avid DNxHD 36: High-quality offline editing of HD progressive sources only. Designed for projécts using an offIineonline workflow due tó large quantities óf source media andór needing more reaI-time preview stréams for craft editoriaI or multicamera éditing. A controlled test was performed to compare uncompressed HD to DNxHD 220 for a film out.
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