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Old July 31st, 2005, 09:36 PM   #1
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Direct dvcprohd to DV from P2 card to dv tape transport?

Is this feature possible? Kind of the same hdv to dv concept conversion, but from P2 to dv?
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Old July 31st, 2005, 10:32 PM   #2
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Hi Sergio,

You're talking about an in-camera downconversion process from DVCPRO HD on the P2 card to DV25 on the tape, right? Just curious how you would use that feature.
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Old August 1st, 2005, 02:17 AM   #3
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Quote:
Originally Posted by Chris Hurd
Hi Sergio,

You're talking about an in-camera downconversion process from DVCPRO HD on the P2 card to DV25 on the tape, right? Just curious how you would use that feature.
Yes, that's what I was thinking. The same way HDV is downconverted to DV trough a press of a button in the sony HDV cameras, probable we could get a similar feature that would downconvert the signal to DV Tape, letting us keep a dv master of the footage (for reference) as well as having the original HD footage in P2 file format.
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Old August 1st, 2005, 02:27 AM   #4
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Yes you can do exactly that. The camera will do a realtime conversion from DVCPRO-HD on the P2 card, to DV on the tape.

Besides your stated interest (having a DV version), there's something else pretty cool you can do with it -- you can use the 720p variable-frame-rate footage and downconvert that, and it keeps the variable-frame-rate nature of the footage as you're downconverting. So basically, you can have variable frame rates in standard-def DV!
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Old August 1st, 2005, 09:46 PM   #5
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Quote:
Originally Posted by Barry Green
Yes you can do exactly that. The camera will do a realtime conversion from DVCPRO-HD on the P2 card, to DV on the tape.

Besides your stated interest (having a DV version), there's something else pretty cool you can do with it -- you can use the 720p variable-frame-rate footage and downconvert that, and it keeps the variable-frame-rate nature of the footage as you're downconverting. So basically, you can have variable frame rates in standard-def DV!
Barry, that's what I wanted to hear! Now if the 9950 bundle came with two 16 gb cards... :)
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Old August 2nd, 2005, 01:04 AM   #6
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16gb don't exist yet... so that's a bit much to be hoping for (but wouldn't that be nice!) The 16gb cards are likely to be announced at NAB 2006.
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Old August 2nd, 2005, 09:19 AM   #7
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barry i did a search, but no luck. can you give us a break down of record times on an 8gig p2 w/ every shooting mode(1080 60i/24p/30p, 720 24p/30p...480i...etc.) thanks and much appreciation!
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Old August 2nd, 2005, 10:32 AM   #8
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Hi Jaser, see my chart, "P2 Card Capacities" located at:

http://www.p2info.net/articles/misc/p2cardcaps.php

I've got DV25, DV50, DV100 rates on there as well as 720p24 vs. 1080i60.

Hope this helps,
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Old August 2nd, 2005, 05:01 PM   #9
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Chris wouldn't 720p 30p use the same data rate as DVCpro 50? Therefore 720p 24p should give you just a little bit more than DVCpro 50. If full HD or 720p 60p uses around 14 MB/s, then half of that or 720p 30p would use around 7 MB/s or the same data rate as the SD 50 format. 24p uses even less data than 30p so instead of 10 minutes on a 8GB card you should get around 20 minutes of 720p 24p. 10 minutes would be for 48p video.
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Old August 2nd, 2005, 06:04 PM   #10
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Thomas is correct. 720/30p uses the same data rate as DVCPRO50, at 50 megabits. 720/24p uses 40 megabits. On an 8gb card you can get 20 minutes of 720/24p.
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Old August 2nd, 2005, 06:06 PM   #11
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Yeah, and you know what else, I have notes in my hand now from Jan's seminar at DV Expo East last week... sure enough, 20 minutes on an 8GB card for 720p24. All I can say is...

D'oh!

...and give me a few minutes while I update that chart...
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Old August 2nd, 2005, 06:15 PM   #12
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Okay fellows, can you check my math please... here is the updated chart:

P2 Card Capacities at http://www.p2info.net/articles/misc/p2cardcaps.php

(and folks remember the HVX200 allows for two P2 cards, so recording times to start off with on a pair of 8GB cards will be 1 hr. 4 min. for DV or DVCPRO, 40 min. for DVCPRO HD at 720p24, 32 min. for DVCPRO 50, and 16 min. for DVCPRO HD at 1080i60 or 720p60)
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Old August 2nd, 2005, 07:04 PM   #13
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Looks right!
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Old August 2nd, 2005, 08:47 PM   #14
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thanks for the update! chris what's missing is 1080/30p and 1080/24p. which time category would these fall into? also, i assume all modes of dv 480/60i, 30p, 24p will be 32min(8gig p2)? thanks again!
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Old August 2nd, 2005, 09:21 PM   #15
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The two 1080p modes are both encased in a 1080i60 stream. Same times for it.
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