Footage Played on Camera is great! But on PC, it’s choppy.

Hello all!

I am using an URSA mini 4.6k camera with an SSD recorder and one of the recommended SSDs. When I use the camera to play back the footage. It’s great. It runs fine at a smooth consistent frame rate. However, imported on my workstation it’s very choppy. It’s confusing me. Especially when I use the playback feature on Resolve. Sometimes it’ll show that it’s running at 29.97 frames with a green light but then start dropping to lower frame rates with the red light, only to hit the desired frame rate (29.97) occasionally.

Could this be because of the external hard drive I’m using?

Can someone offer solutions for me to help solve this issue? I’d really appreciate it!

If you are shooting RAW, you'll need very fast drives.
Don't use the system drive, but either an additional SSD or a RAID.

What OS? What hardware (CPU, GPU, RAM)? How fast is your I/O? Run the Blackmagic Speed Test and see how the system rates on the diagnostic tools.

Hi.

What SSD and size is you using?

2 years ago I was testing recording of uncompressed RAW from my URSA mini 4.6K to a Samsung 850 Pro 512 GB SSD at UHD and 50 fps without any problem. I remember that I was a little surprised, as I had bought two cables. But I read somewhere on the internet, that with 50 fps as we use in Europe it is normal. But with 60 pfs I think that you will need two CFast to SATA cables and two SSD's.

Regards Carsten.

Storage Rates of the BMD UMP at 30 fps.

4608 x 2592

CinemaDNG RAW - 381 MB/s
lossless compressed 12bits log 381 MB/s
uncompressed it is 12bits log 513 MB/s
totally uncompressed it is 16bits 684 MB/s

CinemaDNG RAW 3:1 - 180 MB/s
CinemaDNG RAW 4:1 - 135 MB/s

3840 x 2160

Apple ProRes 444 XQ - 250 MB/s
Apple ProRes 444 - 165 MB/s
Apple ProRes 422 HQ - 110 MB/s
Apple ProRes 422 - 73.6 MB/s
Apple ProRes 422 LT - 51 MB/s
Apple ProRes Proxy - 22.4 MB/s

1920 x 1080

Apple ProRes 444 XQ - 62.5 MB/s
Apple ProRes 444 - 41.25 MB/s
Apple ProRes 422 HQ - 27.5 MB/s
Apple ProRes 422 - 18.4 MB/s
Apple ProRes 422 LT - 12.75 MB/s
Apple ProRes Proxy - 5.6 MB/s

Storage rates based on 30 frames per second.

Hi.

What SSD and size is you using?

2 years ago I was testing recording of uncompressed RAW from my URSA mini 4.6K to a Samsung 850 Pro 512 GB SSD at UHD and 50 fps without any problem. I remember that I was a little surprised, as I had bought two cables. But I read somewhere on the internet, that with 50 fps as we use in Europe it is normal. But with 60 pfs I think that you will need two CFast to SATA cables and two SSD's.

Regards Carsten.

A WD Blue 500GB SSD. It’s under the recommended list of SSDs for the SSD recorder

Windows 10
Intel Xeon CPU E3-1505Mv5 @ 2.80GHz, 2808 Mhz, 4 Cores, 8 log
NVIDIA Quadro M1000M
32 GB of RAM

It is apparently 49.58 MB/s Read. 119.7 MB/s Write