FCP: Sony vs JVC & AIC vs HDV at DVinfo.net

Go Back   DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.

Thread Tools Search this Thread
Old October 26th, 2005, 02:00 PM   #1
HDV Cinema
Join Date: Feb 2003
Location: Las Vegas
Posts: 4,007
FCP: Sony vs JVC & AIC vs HDV

Looking at the docs for 5.0.3 I found a very interesting tidbit.

We know Sony records a PES data stream to tape not a TS as does JVC. But, I've always assumed that both used Closed GOPs. Not so.

While JVC quite does -- Sony uses Open GOPs which mean there are dependencies accross GOP boudaries. The advantage, of course, is Open GOPs squeeze the data more. The downside is that for even a cuts-only timeline all GOP boundries must correctly reflect these dependencies. That may require more than a few new conformed frames as should 720p.

Apple notes that the entire timeline must be "conformed" to meet Sony's HDV requirements. Likewise, even if you are going to another format, it seems as though the entire timeline must be conformed to get proper MPEG-2 that can be decoded and then re-compressed/re-encoded.

So if you have experienced very long export times with HDV and were -- as I was -- using 1080i, this could explain why it took so long.

So it makes sense to me that AIC will be faster to edit than HDV and faster for 1080i during export. But, HDV should be faster to export for 720p.

Still don't have my Mac up so it would be great if someone who has both 1080i and 720p were to experiment with a cuts-only Sequence.
Switcher's Quick Guide to the Avid Media Composer >>> http://home.mindspring.com/~d-v-c
Steve Mullen is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

(800) 223-2500
New York, NY

B&H Photo Video
(866) 521-7381
New York, NY

Texas Media Systems
(512) 440-1400
Austin, TX

Precision Camera
(800) 677-1023
Austin, TX

(800) 323-2325
Mineola, NY

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 11:47 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2018 The Digital Video Information Network