BBC approved Canon XF300 & XF305 for Indie Companies - Page 2 at

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon XF Series 4K and HD Camcorders

Canon XF Series 4K and HD Camcorders
Canon XF705, XF405, XF305, XF205 and XF105 (with SDI), Canon XF400, XF300, XF200 and XF100 (without SDI).

Thread Tools Search this Thread
Old July 26th, 2010, 12:47 PM   #16
Major Player
Join Date: Feb 2007
Location: London UK
Posts: 430

No doubt the resolution is "not as good as i think", but with the L - glass it looks like a very expensive set up to me, and other's i've shown it to. That's more than good enough for me.
Dom Stevenson is offline   Reply With Quote
Old July 26th, 2010, 12:47 PM   #17
Inner Circle
Join Date: Jan 2006
Posts: 2,699
Originally Posted by Mike Marriage View Post
It [35Mb VBR 4:2:0] ISN'T HDV and any argument saying it is is factually incorrect. It is far more robust.
Exactly. Saying it and HDV are the same thing is comparable to saying rough table wine and finest champagne are also one and the same thing, just because both are alcoholic drinks produced from grapes via a fermentation process!
I plan on testing 35Mb VBR 4:2:0 against 50Mb CBR 4:2:2 as it may prove to be more robust than that just without the 4:2:2 colour.
Whilst I agree that the 35Mb codec is pretty robust, theory suggests that the 50Mb version should be even more so. At first sight, it should seem that because 4:2:2 is 33% more pixels than an equivalent 4:2:0 codec, it should need an extra 33% higher bitrate to remain the same compression standard.

In practice, that's not true for two reasons. Firstly, the luminance channel is allocated a higher relative bitrate than chroma, and secondly doubling the number of chrominance pixels doesn't even need the chrominance bitrate to be doubled. It's possible to interpolate the extra chroma pixels from the 4:2:0 ones to a reasonable accuracy - the extra bitrate is then only needed to correct the interpolation, not define the samples from scratch.

So of the 15Mb difference between the two codecs, a lot less than the 12 Mbs that simple theory would suggest is actually needed to give 4:2:2 - the rest is available for general compression improvements.
David Heath is offline   Reply With Quote
Old July 26th, 2010, 01:17 PM   #18
Inner Circle
Join Date: May 2005
Location: Burnaby, BC, Canada
Posts: 3,053
Originally Posted by Peter Moretti View Post
Well HDCAM is 3:1:1.
That's not compressed using MPEG, therefore it has better quality. China Central Television shot exclusively on HDCAM back in 2005-2006 and it's all been accepted into the BBC Motion Gallery.

In the BBC's mind, P and B frames are the enemy. GOPs are the enemy. Low-bitrate Intra frame only is simply unacceptable, but single digit to 1 compression ratios are absolutely fine.
Jack Zhang 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon XF Series 4K and HD Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 08:53 AM.

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