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Canon EOS Full Frame for HD
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Old January 22nd, 2009, 12:07 AM   #1
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How much memory per minute?

Does anyone know off hand how many minutes you would get per gig with the 5D mark2?

I know it does a max of 30min or 4G (at least that's what I heard). Does that mean it's about 7.5 minutes a gig?

I am debating purchasing a 16 or 8 gig card.
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Old January 22nd, 2009, 09:52 AM   #2
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I shot a clip the other day and in shut off at 3.99 GB and I got 14mins 29 seconds recording.
I think the actual time will vary a little depending on what subjects you are shooting.

So approx 275 MB/minute, give or take.
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Old January 22nd, 2009, 10:05 AM   #3
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The maximum video clip file size is 4GB. That's the most you can get in one shot from a 5D Mk. II.

That translates to twelve minutes of HD (1920x1080 at 16:9), or thirty minutes of SD (640x480 at 4:3).

An 8GB card will hold two 12-minute HD clips, for a total of 24 minutes, or two 30-minute SD clips, for a total of one hour. A 16GB card will hold four 12-minute HD clips, for a total of 48 minutes, or four 30-minute SD clips, for a total of two hours.

Of course, if your clips are shorter than the maximum allowed recording time, then you can get more clips on a card... but the overall card capacity doesn't change: an 8GB card holds 24 minutes of HD or one hour of SD. Double that amount for a 16GB card. Hope this helps,
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Old January 22nd, 2009, 10:20 AM   #4
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So how is it that I got 14mins 29 secs in one 3.99 GB clip. Is it something to do with subjects colour/s and tonal range/s compressing differently?
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Old January 22nd, 2009, 10:33 AM   #5
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Sorry, I should have said "approximately" twelve minutes of HD per 4GB clip.

Yes, the recording time may vary, because the compression itself is using a variable bit-rate. So it all depends on what you're aiming the camera at. The maximum it can record under any circumstance is 29 minutes and 59 seconds, and HD clips will come in at approximately twelve minutes when they max out the 4GB file size limitation.

Even though you managed to get 14:29, somebody else in a different shooting situation might not be able to do that -- in fact, they might not be able to make it to 12:00. It all depends. That's why Canon states "approximately" twelve minutes per 4GB clip. Hope this helps,
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Old January 22nd, 2009, 10:30 PM   #6
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Ok thanks for the clarification. A bit like a 2000x3000 picture of a blue sky will compress to a smaller .jpeg than a same-sized picture containing many different colours. Thought it'd be something like that.

The clip I'm referring to was in a pool, mostly one colour.
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Old January 23rd, 2009, 09:35 PM   #7
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Thanks for the info. It's hard for me to wrap my head around memory per minute. I am so used to tape with it's finite standard record times.
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