Direct dvcprohd to DV from P2 card to dv tape transport? at DVinfo.net

Sergio Perez · July 31st, 2005, 08:36 PM

Is this feature possible? Kind of the same hdv to dv concept conversion, but from P2 to dv?

Chris Hurd · July 31st, 2005, 09:32 PM

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.

Sergio Perez · August 1st, 2005, 01:17 AM

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.

Barry Green · August 1st, 2005, 01:27 AM

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!

Sergio Perez · August 1st, 2005, 08:46 PM

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... :)

Barry Green · August 2nd, 2005, 12:04 AM

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.

Jaser Stockert · August 2nd, 2005, 08:19 AM

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!

Chris Hurd · August 2nd, 2005, 09:32 AM

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,

Thomas Smet · August 2nd, 2005, 04:01 PM

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.

Barry Green · August 2nd, 2005, 05:04 PM

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.

Chris Hurd · August 2nd, 2005, 05:06 PM

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...

Chris Hurd · August 2nd, 2005, 05:15 PM

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)

Barry Green · August 2nd, 2005, 06:04 PM

Looks right!

Jaser Stockert · August 2nd, 2005, 07:47 PM

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!

Tom Wills · August 2nd, 2005, 08:21 PM

The two 1080p modes are both encased in a 1080i60 stream. Same times for it.

July 31st, 2005, 08:36 PM	#1
Sergio Perez Major Player Join Date: Feb 2005 Location: Macau Posts: 331	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? __________________ If you don't believe in your film, no one else will.

July 31st, 2005, 09:32 PM	#2
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	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. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

August 2nd, 2005, 09:32 AM	#8
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	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, __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

August 2nd, 2005, 05:06 PM	#11
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	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... __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

August 2nd, 2005, 05:15 PM	#12
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	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) __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

August 1st, 2005, 01:27 AM	#4
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	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!

August 2nd, 2005, 12:04 AM	#6
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	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.

August 2nd, 2005, 08:19 AM	#7
Jaser Stockert Regular Crew Join Date: Jan 2004 Location: California Posts: 147	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!

August 2nd, 2005, 04:01 PM	#9
Thomas Smet Trustee Join Date: Mar 2004 Location: Milwaukee, WI Posts: 1,719	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.

August 2nd, 2005, 05:04 PM	#10
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	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.

August 2nd, 2005, 06:04 PM	#13
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	Looks right!

August 2nd, 2005, 07:47 PM	#14
Jaser Stockert Regular Crew Join Date: Jan 2004 Location: California Posts: 147	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!

August 2nd, 2005, 08:21 PM	#15
Tom Wills Major Player Join Date: May 2005 Location: Philadelphia, PA Posts: 326	The two 1080p modes are both encased in a 1080i60 stream. Same times for it.