Blackmagic Forum

Hello

I would like to prevent manual operation on the tripod and missing image detail.
So I choose long shots, film in 6K with 50 frames and want to zoom, pan
and create slow motion in post-production.

I work with 3 pieces of Samsung T7 2TB
Blackmagic Camera Setup says the software is up to date 8.1

The recording always stops about Frame-drop by, all of mine 3 T7s and they get hot.
I have no idea whether the transfer is incorrect or the SSD is too hot, there is no indication of the error.

I read many references that the data transfer rate is invalid.

My Samsung T7 is supposed to tolerate 1000MB/s
Blackmagic says: Full 6K Sensor Constant Quality on Q3 is only 277 MB/s for 30 images.
At my 50 frames per second there can be 3x more data, because 3x277 MB/s is still below the rate of the T7 SSD.

I have read many problems from other users, all of them have the same problem.
There is evidence of new firmware 8.6, but my camera setup program says 8.1 is up to date

Which setting do I have to make in order to be able to record the promised full sensor 6K with 50 frames per second.

It is sports and theater recording lasting up to two hours.

So far, recording with 6K, 50 images and Q3 always stopped after 30-40 minutes

If those are regular T7 (not Shield), forget it. They are not approved for a reason.

I have not been able to make my P4K fail with this media, even at C4K Q0 60 FPS.

There is more data with the P6K, so maybe not the same results. But worth looking into...

https://www.bhphotovideo.com/c/product/ ... _525r.html

Mt. Bee wrote:My Samsung T7 is supposed to tolerate 1000MB/s

Other than the URSA 12K and URSA Cine bodies, the USB-C ports on BMD’s cameras are limited to USB 3.1 speeds. USB 3.1 is marketed as a 5Gbps standard but can’t sustain anything close to that in practical terms—it usually caps out around 400-425MB/s for me. So it doesn’t matter how fast your SSDs are; the port they’re connected to isn’t fast enough to sustain 6K Q3 at 50FPS in challenging scenes.

The smart move—beyond making sure you’re using T7 Shield drives and not just regular T7 drives—is to use a constant bitrate setting instead of constant quality. 6K 50FPS at 5:1 is truly the best you can get out of the BMPCC6K bodies because neither the SDXC, CFast, or USB-C ports can sustain any more than that.

Today is a good day for my workflow and a bad day for my wallet.

I'm testing the SAMSUNG T7 with the new SAMSUNG T9 because I had several problems with the SAMSUNG T7.

With the BMPCC6KPRO I had frame dropouts after around 30 minutes at 50 frames/s 6K resolution in quality Q3 with all of my SAMSUNG T7!

Today this quality was tested with the new SAMSUNG T9, on the same USB port of the BMPCC6KPRO

Although this USB port is always described as 3.1 with a maximum of 1280MB/s, I was able to use it for over 2 hours without dropouts

I tested the two memories: T7 and T9 on my PC with USB 3.2:

The T7 reaches a maximum of 1061 MB/S
The T9 achieves 2004 MB/s



It is therefore a fact, even if it is not technically understandable, that the SAMSUNG T9 on the BMPCCK6PRO can perfectly record the full 6K at 50 frames per second.

I have attached CrystalDisk's measurement:

You can see the maximum performance of 788 MB/s on the T7 when measuring: SEQ1M Q1T1

With the T9, when measuring: SEQ1M Q1T1 the maximum performance of 1271 MB/s

This means that a different transfer rate is achieved depending on the write/read method and the T7 is definitely not suitable for use with the BMPCCK6PRO for a frame rate higher than 30 files per second.

The dropout problems are therefore not due to the USB 3.1 with a maximum rate of 1280 MB/s, but to the SAMSUNG T7, which "only" achieves a transfer rate of 788MB/s in the write mode used by BMPCCK6PRO.

I'm not technically savvy enough to understand the difference between the different writing modes, but I could imagine that a future firmware update from Blackmagic could offer a different method and thus make the SAMSUNG T7 attractive again.

For me the topic is closed because my new SAMSUNG T9 meets my needs

Thanks for the updated information.