Last year I made a list of SD Cards for the Blackmagic Pocket Cinema Camera, most hasn't changed from that list but we now have a few more options, a "new" official speed designation, UHS Speed Classification 3 or "U3"; the "U3" designation simply means the cards minimum write speed is 30MB/s (that's MegaBytes). Many "U3" cards are just rebadged "U1" cards that meet the "U3" speed requirements. According to the SD Association all "U3" badged cards officially sustain 30MB/s so they they should all work for ProRes HQ (27.5MB/s) without any dropped frames, though Blackmagic seems to favor Sandisks it would be alarming if non-Sandisk "U3" cards are still consistently having trouble with ProRes in the Pocket.
Also Magic Lantern's 1080p24 Raw is 83MB/s (MegaBytes). The older Canon DSLRs that only support Class 10 SD cards are limited to 21MB/s so they cannot record HD Raw, they start to drop frames and stop recording after about 2 seconds, they can only record Raw in a non-HD of 960x540 at 24fps. The newer Canon DSLRs that support UHS-1 SD cards are limited to 40MB/s which is still not enough for 1080p24 RAW but just enough for Canon's 720p 24fps Raw. Blackmagic on the other hand designed their software to only require 57.6MB/s to record 1080p24 Raw by using Cinema DNG in a 12bit container and Lossless compression with a slightly variable bit rate rather than Magic Lantern's/Canon's bloated 14bit CR2/DNG frames; so I think Blackmagic actually designed their software more efficiently but why only Sandisk cards work is anyones guess and better left to the conspiracy theorists.
Justin Battle wrote:I may have missed it somewhere, but, I'm trying to find out how much RAW footage a SanDisk extreme pro 32gb and 64gb can hold before it is full? Does anyone have any estimates?
Since the Pocket uses a variable bit rate for Raw the number may change a little but these are the worst case scenarios when you have a lot of details filling the frame for the entire recording:
For CinemaDNG 72MB/s (30 FPS):
128GB (28 mins)
64GB (14 mins)
32GB (7 mins)
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For CinemaDNG 60MB/s (25 FPS):
128GB (34 mins)
64GB (17 mins)
32GB (8:30 mins)
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For CinemaDNG 57.6MB/s (24 FPS):
128GB (36 mins)
64GB (18 mins)
32GB (9 mins)
http://diffractedmedia.blogspot.com/201 ... cards.htmlhttp://www.magiclantern.fm/forum/index.php?topic=6215.0http://nofilmschool.com/2013/11/raw-firmware-update-1-5-cinema-dng-blackmagic-pocket-cinema-camera