DNxHR Format Support

DNxHR Format Support

DNxHROne of the key ContentAgent v3.6 features is the ability to transcode to Avid’s DNxHR format as MXF files. Available as a paid for option,
DNxHR enables you to create higher-than-HD resolutions including 2K, UHD and 4K clips ready for editing in a standalone or shared storage/Interplay environment.

DNxHR comes in five different flavours:

Name Description Bit-Depth Chroma sub-sampling Compression Ratio
DNxHR 444 DNxHR 4:4:4 12 RGB / 4:4:4 4.5:1
DNxHR HQX DNxHR High Quality (12 bit) 12 4:2:2 5.5:1
DNxHR HQ DNxHR High Quality (8 bit) 8 4:2:2 4.5:1
DNxHR SQ DNxHR Standard Quality 8 4:2:2 7:1
DNxHR LB DNxHR Low Bandwidth 8 4:2:2 22:1

DNxHR is ideal for creating full resolution 2K, UHD and 4K media files and offline / online workflows. Below is a useful table showing the DNxHR frame size per codec (including the data rate).

Format Codec Samples per line Active lines  Bytes per frame Data rate (in MB/s)
23.976 25 29.97 50 59.94
2K DNxHR 444 2048 1080 1941504 44.39 46.29 55.49 92.58 110.98
DNxHR HQX 2048 1080 970752 22.20 23.14 27.75 46.29 55.49
DNxHR HQ 2048 1080 970752 22.20 23.14 27.75 46.29 55.49
DNxHR SQ 2048 1080 643072 14.70 15.33 18.38 30.66 36.76
DNxHR LB 2048 1080 200704 4.59 4.79 5.74 9.57 11.47
UHD DNxHR 444 3840 2160 7286784 166.61 173.73 208.27 347.46 416.54
DNxHR HQX 3840 2160 3641344 83.26 86.82 104.08 173.63 208.15
DNxHR HQ 3840 2160 3641344 83.26 86.82 104.08 173.63 208.15
DNxHR SQ 3840 2160 2408448 55.07 57.42 68.84 114.84 137.67
DNxHR LB 3840 2160 749568 17.14 17.87 21.42 35.74 42.85
4K DNxHR 444 4096 2160 7770112 177.67 185.25 222.08 370.51 444.16
DNxHR HQX 4096 2160 3887104 88.88 92.68 111.10 185.35 222.20
DNxHR HQ 4096 2160 3887104 88.88 92.68 111.10 185.35 222.20
DNxHR SQ 4096 2160 2568192 58.72 61.23 73.40 122.46 146.81
DNxHR LB 4096 2160 798720 18.26 19.04 22.83 38.09 45.66

For HD-resolution media an enhanced DNxHD encoder is also included when you purchase the ContentAgent DNxHR option. Testing in the Root6 development lab has shown that HD encoding has been improved by more than two times real-time. For example a DNxHD which previously encoded at 60fps (frames per second) will now transcode at 140fps with this new option. Note your own mileage may vary as many factors (CPU power, network performance etc) can effect processing times.

In a ContentAgent workflow you can ingest 2K, UHD and 4K camera cards (and single clips) into an Avid environment. You can choose to transcode clips to DNxHR op-atom or op1a MXF files. You can see that the LB codec is ideal as a proxy resolution for offline/online relink based workflows. This opens up a number of potential standalone Media Composer conforming and Interplay multi resolution (dynamic relinking) workflows to be automated with ease. QuickTime MOVs can also be transcoded using the QuickTime 7 encoder.

To conclude – The ability for ContentAgent to transcode clips into DNxHR is extremely useful when designing the most efficient workflows to automate the ingest of 2K, UHD and 4K material.

By |2017-05-20T13:03:51+00:00January 16th, 2017|ContentAgent, Products, Technical Article|