DNxHR 444 at 4K UHD (3840×2160): bitrate & storage per minute/hour
DNxHR 444 (Avid DNx) is a 12-bit 4:4:4 codec with a typical compression ratio of 4.5:1. The table shows the video data rate and storage it needs at 4K UHD (3840×2160) for common frame rates — video only, audio not included.
| Frame rate | Bitrate | Data rate | Storage / minute | Storage / hour |
|---|---|---|---|---|
| 23.976 fps | 1,336.4 Mbps | 167.05 MB/s | 10.02 GB | 601.4 GB |
| 24 fps | 1,337.7 Mbps | 167.22 MB/s | 10.03 GB | 602.0 GB |
| 25 fps | 1,393.5 Mbps | 174.18 MB/s | 10.45 GB | 627.1 GB |
| 29.970 fps | 1,670.5 Mbps | 208.81 MB/s | 12.53 GB | 751.7 GB |
| 50 fps | 2,786.9 Mbps | 348.36 MB/s | 20.90 GB | 1,254.1 GB |
| 59.940 fps | 3,341.0 Mbps | 417.62 MB/s | 25.06 GB | 1,503.4 GB |
How much fits on a card or drive
Continuous recording time at 4K UHD (3840×2160) and 24 fps, video only. Useful for planning how many cards a shooting day needs.
| Capacity | Recording time | Cards for 1 hour |
|---|---|---|
| 64 GB | 6 min | 10 |
| 128 GB | 13 min | 5 |
| 256 GB | 26 min | 3 |
| 512 GB | 51 min | 2 |
| 1 TB | 1 h 40 min | 1 |
What hardware it needs
Playing this back in real time means sustaining 167.22 MB/s of reads. One hour of footage is 602.0 GB, and that is what has to travel every time you copy, back up or archive it.
Any card or drive rated below 167 MB/s sustained will drop frames on playback, whatever its peak speed says on the box.
| Interface | Sustained speed | Copying 1 hour |
|---|---|---|
| 1 GbE network (1 Gbps) | 110 MB/s | 1 h 31 min |
| USB 3.2 Gen 1 (5 Gbps) | 400 MB/s | 25 min |
| USB 3.2 Gen 2 (10 Gbps) | 850 MB/s | 12 min |
| Thunderbolt 3 / 4 (40 Gbps) | 2500 MB/s | 4 min |
Times are for a single copy without checksum verification. Verified offload reads back what it wrote, so it takes roughly twice as long.
When to use it
Each frame is compressed on its own, so any frame can be decoded without reading its neighbours: scrubbing and frame-accurate cutting stay responsive, at the cost of larger files. The 4:4:4 sampling keeps full colour resolution, which is what compositing, keying and heavy grading need. The extra bit depth gives grading room before gradients start to band.
Compared with other codecs
Same resolution and frame rate, so the difference is the codec alone:
- DNxHR 444 takes 1.9× the space of DNxHR HQX (698.7 Mbps)
- DNxHR 444 takes 2.0× the space of DNxHR HQ (668.9 Mbps)
- DNxHR 444 takes 3.0× the space of DNxHR SQ (445.9 Mbps)
Related guides
- Same codec at Full HD 1080p (1920×1080): DNxHR 444 · Full HD 1080p (1920×1080)
- Other codecs in the same family: DNxHR LB · DNxHR SQ · DNxHR HQ · DNxHR HQX
Figures use decimal units (1 GB = 1000 MB), the convention used by drive and camera manufacturers. Computed with the same calculation engine as the Workflow Data Calculator — open it to add audio, streams, backup copies, offload time and storage cost, or to export a PDF report.
Certified Adobe & Blackmagic training and postproduction workflow consulting by Jorge Mochón — jmochon.training