Is there any difference between an I-frame, intra frame, inter frame, and key frame. at DVinfo.net

Go Back   DV Info Net > Apple / Mac Post Production Solutions > Final Cut Suite

Final Cut Suite
Discussing the editing of all formats with FCS, FCP, FCE


Reply
 
Thread Tools Search this Thread
Old October 5th, 2012, 09:26 AM   #1
Regular Crew
 
Join Date: Mar 2012
Location: Melbourne, Australia
Posts: 25
Is there any difference between an I-frame, intra frame, inter frame, and key frame.

Each have their own wikipedia page but is there any real difference between these four types of frame?

I'm using Compressor 4 to burn a DVD and under encoding settings it gives me the option to set Key frame every so many seconds. Is this an I-frame?

I thought an I-frame stands for intra-frame, then what is an inter frame, and why call it a key frame?

I-frame:
Video compression picture types - Wikipedia, the free encyclopedia

Intra-frame:
Intra-frame - Wikipedia, the free encyclopedia

Inter frame:
Inter frame - Wikipedia, the free encyclopedia

Key frame:
Key frame - Wikipedia, the free encyclopedia
__________________
edwinstreet.com
Edwin Street is offline   Reply With Quote
Old October 5th, 2012, 12:28 PM   #2
Inner Circle
 
Join Date: Sep 2002
Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada
Posts: 4,087
Re: Is there any difference between an I-frame, intra frame, inter frame, and key fra

An I frame in an MPEG-2 stream is the only type of frame that contains ALL the picture data. P and B frames contain information about what is changed from previous and upcoming I frames.

The more I frames, the closer they are together timewise... and the data rate will likely climb...

USUALLY this increases image quality BUT if too many I frames are used at a given data rate, you don't give the codec enough residual data rate to "do it's job" properly and the I frames will look great but the non-I frames will look LOUSY, causing a visual degrading of the image not entirely unlike strobing, except in image quality, not luminance.

Clear as tar?
__________________
Shaun C. Roemich Road Dog Media - Vancouver, BC - Videographer - Webcaster
www.roaddogmedia.ca Blog: http://roaddogmedia.wordpress.com/
Shaun Roemich is offline   Reply With Quote
Old October 5th, 2012, 12:31 PM   #3
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,131
Re: Is there any difference between an I-frame, intra frame, inter frame, and key fra

you can call them the way you want, but each application is referring to its language. So if some call it keyframe and give the meaning, it could be called Intra frame elsewhere and the same definition will be also given.
In most video editing apps, a keyframe is just a pointer indicating an effect modification.
If you are in mpeg encoding, you will use another vocabulary I , P, B frames.
just use the right word at the right place.
Giroud Francois is offline   Reply
Reply

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

Professional Video
(800) 833-4801
Portland, OR

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

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

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 > Apple / Mac Post Production Solutions > Final Cut Suite

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 06:16 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network