28Mbs 60p vs 24Mbs 30p at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony NXCAM / AVCHD Camcorders

Sony NXCAM / AVCHD Camcorders
Sony HXR-NX100, HXR-NX70, NX30, NX5, NX3/1, HXR-MC2500, HDR-AX2000, etc.


Reply
 
Thread Tools Search this Thread
Old January 3rd, 2014, 03:24 PM   #1
Major Player
 
Join Date: Aug 2005
Posts: 421
28Mbs 60p vs 24Mbs 30p

How does it work...they say that camera is recording 60p @ 28Mbs and when shooting 30p @ 24Mbs. Using logic and simple math it looks like each frame in 60p should be @0.46 Mbs while 30p 0.8Mbs so picture quality in 30 should be best...
In your opinion for footage viewed on HD TV which setting would produce best picture quality? what about 60i?
Marius Boruch is offline   Reply With Quote
Old January 3rd, 2014, 07:45 PM   #2
Inner Circle
 
Join Date: Mar 2003
Location: Ottawa, Ontario, Canada
Posts: 3,943
Re: 28Mbs 60p vs 24Mbs 30p

Compression doesn't work that way. The AVCHD is a longGOP codec recording an i frame then difference frames. Only the differences need to be recorded so the difference between 30fps and 60fps are not that much in terms of differences that need to be recorded. Personally I shoot 60P.

Ron Evans
Ron Evans is offline   Reply With Quote
Old January 3rd, 2014, 08:02 PM   #3
Major Player
 
Join Date: Aug 2005
Posts: 421
Re: 28Mbs 60p vs 24Mbs 30p

Agree, 60p comes very handy if for example slow motion is needed (providing that you have such a beautiful software like Sony Vegas which accepts EVERYTHING in timeline - all resolutions, formats, p and i...everything except aac). I feel sorry for those who work with Apple final cut and Premiere. Would you believe they are still in those "red rendering line" times - but that's another subject.
Marius Boruch is offline   Reply With Quote
Old January 3rd, 2014, 08:12 PM   #4
Inner Circle
 
Join Date: Jan 2006
Posts: 2,699
Re: 28Mbs 60p vs 24Mbs 30p

Quote:
Originally Posted by Ron Evans View Post
Compression doesn't work that way. The AVCHD is a longGOP codec recording an i frame then difference frames. Only the differences need to be recorded so the difference between 30fps and 60fps are not that much in terms of differences that need to be recorded. Personally I shoot 60P.
To amplify what Ron says, then whether it's 30p or 60p, the I frames are recorded at the same time interval in each case, typically two a second. Since they are much larger than difference frames in terms of data size, that's why doubling the framerate does not mean anything like doubling the coded datarate for a long-GOP system.
David Heath is offline   Reply With Quote
Old January 3rd, 2014, 08:36 PM   #5
Inner Circle
 
Join Date: Mar 2003
Location: Ottawa, Ontario, Canada
Posts: 3,943
Re: 28Mbs 60p vs 24Mbs 30p

Quote:
Originally Posted by Marius Boruch View Post
Agree, 60p comes very handy if for example slow motion is needed (providing that you have such a beautiful software like Sony Vegas which accepts EVERYTHING in timeline - all resolutions, formats, p and i...everything except aac). I feel sorry for those who work with Apple final cut and Premiere. Would you believe they are still in those "red rendering line" times - but that's another subject.
Yes I use Edius Pro7 and Vegas 12 they edit almost everything from native files realtime. I have CS6 production suite for Photoshop and After Effects and don't use Premiere these days. Main editor is Edius with Vegas mainly used for audio.

Ron Evans
Ron Evans is offline   Reply With Quote
Old January 3rd, 2014, 08:58 PM   #6
Major Player
 
Join Date: Aug 2005
Posts: 421
Re: 28Mbs 60p vs 24Mbs 30p

I keep asking myself why people are stuck with FinalCut and Premiere - It can not be price of software ($600), probably they are stuck with Apple "gotcha" thing - "you are compatible only with us"...after working on Vegas (starting on ver 7) I will not touch Premiera not to mention Final Cut. O, have you heard that today Apple was downgraded at the stock market.
Marius Boruch 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 > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony NXCAM / AVCHD Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 04:39 AM.


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