Mark Grgurev wrote:According to the Blackmagic website, lossless 4K DCI at 30 fps is roughly 272 MB/s which means it would be 544 MB/s at 60fps. This exceeds the maximum usable bandwidth of the USB 3.1 Gen 1 specification that the USB-C port supports and while it's just in range of what Cfast 2.0 can do, the fastest CFast card I can find only has a max write speed of 510 MB/s.
Is there some means of recording that the Pocket 4K supports that we don't know about? I know it can't record to SD and Cfast at the same time but can it record to either one of those and USB-C at the same time? That's really the only way I can imagine that working. Or is BMD expecting sufficiently fast CFast cards to eventually come out?
Also, if this dilemma is at all putting the camera at risk of being delayed then just drop the feature and limit us to compressed formats in that mode lol
Hi Mark!
I'm building cfast to ssd adapters for ursa and canon c200 cameras and was curious if I can record lossless 4K DCI at 60fps. So I did a test:
-Samsung 850 evo 1tb msata inside an 2.5" msata-sata enclosure
-cfast to sata cable/adapter
-usb to powerSATA cable to power the ssd from pc. Have no power-banks in house at this moment.
Guess what! I was able to record 29min wit zero droped frames!
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