recording times of the new 4k bmpc raw on a 480g ssd?

Got something to discuss that's not about Blackmagic products? Then check out the Off-Topic forum!
  • Author
  • Message
Offline
User avatar

Donnell Henry

  • Posts: 1110
  • Joined: Wed Dec 25, 2013 9:04 pm
  • Location: Brooklyn ny

recording times of the new 4k bmpc raw on a 480g ssd?

PostThu Jan 09, 2014 12:09 am

does anyone know what the recording times will be on the bmpc on a 480g ssd in raw?
GODS CREATE
Offline
User avatar

Donnell Henry

  • Posts: 1110
  • Joined: Wed Dec 25, 2013 9:04 pm
  • Location: Brooklyn ny

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostWed Jan 15, 2014 11:31 pm

just to update this...i spoke with a rep today from black magic and he said...( take this with a grain of salt)
He said roughly 1 hour of compressed cinema DNG files raw would take about 4 terabytes of space. All i have to say to that is WOWZERZ!!!!
GODS CREATE
Offline
User avatar

Troy Turner

  • Posts: 95
  • Joined: Sat Nov 02, 2013 1:03 pm

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostSat Jan 18, 2014 6:08 am

WOWZERZ indeed!
Offline
User avatar

adamroberts

  • Posts: 4538
  • Joined: Wed Aug 22, 2012 5:27 am
  • Location: England, UK

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostSat Jan 18, 2014 7:09 am

Probably just below that but yeah that is no surprise. 4K is 4 times the size of HD.

The BMPCC RAW is about 2.5MB/frame. So expect the 4k RAW to be about 10MB/frame... Then do the math.
Offline
User avatar

Donnell Henry

  • Posts: 1110
  • Joined: Wed Dec 25, 2013 9:04 pm
  • Location: Brooklyn ny

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostSun Jan 19, 2014 1:21 am

jeez…imagine that 1 frame of footage..how far we've come ;) ..now its time to sell my blood so i can at least try to buy two 6 terabyte hard drives to hold all that footage..i bought a multi dock from black magic so that should help with space. i can just edit from the multi dock and save the edited footage on one of the drives and use the 2nd drive for backing up all footage i shoot.
Can anyone recommend a solid Thunderbolt drive from 4TB and up, that doesn't fail as much as all these other drives. I've been looking at G raid and WD drives so far..so far these drives have seem to fail less than other drives
GODS CREATE
Offline
User avatar

Donnell Henry

  • Posts: 1110
  • Joined: Wed Dec 25, 2013 9:04 pm
  • Location: Brooklyn ny

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostSun Jan 19, 2014 3:43 am

Then its worth it ;)
GODS CREATE
Offline

Scott Pultz

  • Posts: 558
  • Joined: Wed Jan 16, 2013 12:36 am
  • Location: Seattle

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostFri Jan 31, 2014 5:29 am

adamroberts wrote:Probably just below that but yeah that is no surprise. 4K is 4 times the size of HD.

The BMPCC RAW is about 2.5MB/frame. So expect the 4k RAW to be about 10MB/frame... Then do the math.


The math says that it is a lot less than 4tb / hour
Offline
User avatar

Donnell Henry

  • Posts: 1110
  • Joined: Wed Dec 25, 2013 9:04 pm
  • Location: Brooklyn ny

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostMon Feb 03, 2014 2:44 am

REALLY? if its a lot less that'll be awesome
GODS CREATE
Offline
User avatar

rick.lang

  • Posts: 17175
  • Joined: Wed Aug 22, 2012 5:41 pm
  • Location: Victoria BC Canada

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostMon Feb 03, 2014 5:25 pm

Seal of the gods wrote:REALLY? if its a lot less that'll be awesome


To store an hour of uncompressed raw as captured by the camera would be roughly 1.4 TB including audio. We've been told that the raw from the BMPC4K will be compressed and the approximate amount of compression discussed at NAB2013 was 2.5x since it will be lossy. Therefore one hour would take about 560 GB to capture on an SSD. If you are using a 480 GB SSD, you want to stop recording after about 52 minutes (same as uncompressed raw on the BMCC). At least that appeared to be BMD's goal at NAB2013: the compressed raw from the BMPC4K would take roughly the same amount of space as the uncompressed raw from the BMCC.

When you uncompress the raw and debayer it, you will be needing a lot more space to store your video files. That figure of 1.4 TB relates to the 12bits of log data written per photosite. If your debayered video was stored as uncompressed 10 bit YUV, the AJA video calculator says it will take 2.4 TB per hour. If 10 bit RGB, 3.6 TB per hour. If you transcode to ProRes 4:2:2 HQ (or shoot in ProRes 4:2:2 HQ), you will store 448 GB including audio per hour. Therefore a 480 GB SSD, will record at least an hour of ProRes 4:2:2 HQ including audio.

The AJA calculator may be stating the numbers a bit high but they are certainly in the ballpark.

Rick Lang
Sent from my iPad using Tapatalk HD
Rick Lang
Offline
User avatar

Donnell Henry

  • Posts: 1110
  • Joined: Wed Dec 25, 2013 9:04 pm
  • Location: Brooklyn ny

Re: recording times of the new 4k bmpc raw on a 480g ssd?

PostMon Feb 03, 2014 11:03 pm

Thank you rick for the in-depth info. This all means, just to be safe i'll need at least an 8 terabyte hard drive to dump the files to. That should be enough space for 2 hours of footage worst case scenario
GODS CREATE

Return to Off-Topic

Who is online

Users browsing this forum: No registered users and 32 guests