145Mbps is the data rate for 1920 x 1080 30fps interlaced sources (60 fields). 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.Īvid 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.Īvid DNxHD 145: For high-quality mastering when using 8-bit lower data rate sources such as HDCAM and DVCPRO.
The data rate is dependent on frame rate. This codec is only seen in projects made in the RGB colour space.Īvid DNxHD 220x: For a high-quality image in YCbCr-colour space for 10-bit sources.
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Full resolution, 10-bit 4:4:4 RGB video sampling and high bit-rate is a visually loss less compression.
We'll start with the highest quality and work our way down to the lowest.Īvid DNxHD 444: For 1920x1080 progressive projects. The complete white paper for Avid is available here. Let's keep things simple at the moment and compare the US standard format 1080p30 with PAL 1080p25 format. 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)īut what are the codecs that are available and how do you interpret their figures and names? The list reads straightforward enough, but when mixed in with varying frame rates (60/50/30/25/24 fps etc) and raster sizes (1080 or 720) and the figures may change a little. Let's look at them both and what they are suitable for.Īs 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. While this new codec has been released this does not mean the end of DNxHD. As a result, Avid revised its codecs in line with this demand and released an updated DNxHR codec set. With recent UHD formats becoming more widely used in cameras, users now need to edit in 2K, 4K and even 8K. Avid had to create a set of high-quality High Definition codecs back in the mid-2000's to allow them to move High Definition video content over their I/O connection pipe of choice for the time, a domestic 400Mbs Firewire cable! This was the birth of DNxHD codecs.ĭNxHD became a very popular finishing and editing codec as it was a Media Composer friendly format and the compression also allowed users to store HD content on drives which, at the time, had limited performance and capacity.
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