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How many minutes of 1080p on 16, 32, 64GB?

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19 Jan 2013 21:52 - 19 Jan 2013 21:53 #20167 by Neguah
How many minutes of 1080p on 16, 32, 64GB? was created by Neguah
So far, I understand that 1920-1080 is 24mbps. Megabits per second. Right?

During 1 second I have stored 24mbps on my memory card.
24mbps is 3MB since 1 Byte is 8 bits.
So 3MB in 1 second.
180MB in 1 minute
10800MB in 1 hour

My head says that 64BG gives me almost 6 hours of 1920-1080, but that can´t be right, can it?

How is the math when we start operating with frame rates? Is 24mbps 25fps?
Last edit: 19 Jan 2013 21:53 by Neguah. Reason: Bad spelling

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20 Jan 2013 00:30 #20171 by cgbier
Replied by cgbier on topic How many minutes of 1080p on 16, 32, 64GB?
AVCHD? Yeah, roughly. I get about about 160 minutes of MXF at 50mbps onto a 64 GB card.

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20 Jan 2013 15:00 #20182 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
Give AJA's "DataCalc" a spin. I love it. Very fast and easy, and you don't get headaches doing actual math.
www.aja.com/en/products/software/

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20 Jan 2013 15:18 - 20 Jan 2013 15:20 #20183 by Neguah
Replied by Neguah on topic How many minutes of 1080p on 16, 32, 64GB?

BenB wrote: Give AJA's "DataCalc" a spin. I love it. Very fast and easy, and you don't get headaches doing actual math.
www.aja.com/en/products/software/


Where is AVCHD?
Is MPEG-4 AVC/H.264 the same as AVCHD? The reason I´m asking is that the 650D(think it is the T4i) the video format is "MPEG-4 AVC/H.264, MOV".
Don´t know what to choose on presets and compression.
Last edit: 20 Jan 2013 15:20 by Neguah.

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20 Jan 2013 15:48 - 20 Jan 2013 15:52 #20184 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
Ah, AJA hasn't kept up. Try this one from Digital Rebellion.
www.digitalrebellion.com/webapps/video_calc.html

You're getting plain old H.264 from your Ti4, not the AVCHD flavor of H.264.

At 24fps with 1080p H.264, 64 GB will hold aprrox 110 minutes.
Last edit: 20 Jan 2013 15:52 by BenB.

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20 Jan 2013 15:54 #20185 by Neguah
Replied by Neguah on topic How many minutes of 1080p on 16, 32, 64GB?

BenB wrote: You're getting plain old H.264 from your Ti4, not the AVCHD flavor of H.264.


What?!
How about 60D(Ti3)? Can only see I´m just getting .mov.

Is it worth buying Ti4 with the old H.264?

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20 Jan 2013 16:32 #20187 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
Ti is the Rebel series, and are plain old H.264, all of them. But that's not really the issue. At the core AVCHD is just fancy H.264 anyway, should take up the same space.

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20 Jan 2013 16:43 #20188 by Neguah
Replied by Neguah on topic How many minutes of 1080p on 16, 32, 64GB?

BenB wrote: Ti is the Rebel series, and are plain old H.264, all of them. But that's not really the issue. At the core AVCHD is just fancy H.264 anyway, should take up the same space.


What is actually the difference? Is it noticeable for anyone when watching?

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20 Jan 2013 16:45 #20189 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
Nope.

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20 Jan 2013 20:38 #20191 by cgbier
Replied by cgbier on topic How many minutes of 1080p on 16, 32, 64GB?

BenB wrote:
At 24fps with 1080p H.264, 64 GB will hold aprrox 110 minutes.


Are you sure about that? I'd think it's some five to six hours.

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20 Jan 2013 21:49 - 20 Jan 2013 21:50 #20194 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
Not according to the Digital Rebellion calculator.
5 hour would be 173.45 GB.
Last edit: 20 Jan 2013 21:50 by BenB.

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20 Jan 2013 22:02 #20196 by cgbier
Replied by cgbier on topic How many minutes of 1080p on 16, 32, 64GB?
There must be something wrong with that calculator. As mentioned above, I get nearly 3 hours of 50 Mbps onto my 64GB cards, so h.264 should at least be double.

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20 Jan 2013 22:30 #20198 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
There are a lot of variables, nothing is an absolute. What camera, what codec, color sampling, action or talking head shots?

You can't say "1080p is this data rate" because too much else matters. Different camera manufactures tweak their codecs, do proprietary stuff, etc.

So, what camera/code specifically are we talking about?

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21 Jan 2013 00:49 #20200 by cgbier
Replied by cgbier on topic How many minutes of 1080p on 16, 32, 64GB?
Just checked the manual of the 60D and T4i. They get 176 minutes into a 64GB card in best quality. 330MB per minute.

That is weird, as it means that my Canon XF has double the compression rate of the h.264 in the SLRs.

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21 Jan 2013 00:58 - 21 Jan 2013 02:20 #20201 by BenB
Replied by BenB on topic How many minutes of 1080p on 16, 32, 64GB?
330Mb, it should read. DVCPRO-HD is and considered high 100Mb/sec. I'll have to check this out. 330 sound a bit high to me.
Last edit: 21 Jan 2013 02:20 by BenB.

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21 Jan 2013 03:45 #20203 by cgbier
Replied by cgbier on topic How many minutes of 1080p on 16, 32, 64GB?
That's what the manual said. I was amazed myself.

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21 Jan 2013 04:42 #20204 by marchyman
Replied by marchyman on topic How many minutes of 1080p on 16, 32, 64GB?
Canon publishes a table that talks about H.264 format in a .MOV container using about ~330 MB/minute. That's for 1920x1080 NTSC at 29.97 fps. The measurement is MB/min, not Mb/sec. 330 MB/min is about 44 Mb/sec.

That's for the 7D. I'm assuming the other canon DSLRs are similar.

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21 Jan 2013 06:47 #20206 by Karsten Schlüter
Replied by Karsten Schlüter on topic How many minutes of 1080p on 16, 32, 64GB?

Neguah wrote: So far, I understand that 1920-1080 is 24mbps. Megabits per second. Right?…


No.
AVCHD v1 supports a max rate of 24mbps
AVCHD v2 supports a max rate of 28mbps

'tweaking' the standards leads to, e.g., 34mbps '(JVC px100) or 50mbps (Pana GH3) ....

plus .... some specs speak of a 'peak rate' aka VBR-encoding

finally: don't mistake megaBITS with megaBYTES ... ;)

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21 Jan 2013 10:45 - 21 Jan 2013 10:54 #20209 by Lee Patterson
Replied by Lee Patterson on topic How many minutes of 1080p on 16, 32, 64GB?
It is approx 3 minutes per gb (canon t series)
As to choosing the right preset in FCPX, I simply tell the software to base it on the first import footage, I figure why have a dog and bark. I paid good money for modern software that is purpose built to automate those decisions (mostly likely better than I can:)) and devote my meagre brain to other parts of the edit process.
Last edit: 21 Jan 2013 10:54 by Lee Patterson. Reason: more copmplete response

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