magic lantern kelvin wb - Page 2 at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


Reply
 
Thread Tools Search this Thread
Old February 2nd, 2011, 07:41 AM   #16
Major Player
 
Join Date: May 2007
Location: Ireland
Posts: 579
On examining the files on the card after continuous recording each file is 3.9 gb in size. So i assume the 4 gb limit was reached before the 12 minute limit in every case.
I was pointing camera at a tv screen.
Ger Griffin is offline   Reply With Quote
Old February 2nd, 2011, 07:52 AM   #17
Regular Crew
 
Join Date: Nov 2010
Location: Woodstock, GA
Posts: 89
Gotcha, thanks for that information
Russ Ivey is offline   Reply With Quote
Old February 2nd, 2011, 09:12 AM   #18
Major Player
 
Join Date: Apr 2010
Location: Chelmsford England
Posts: 287
Quote:
Originally Posted by Ger Griffin View Post
On examining the files on the card after continuous recording each file is 3.9 gb in size. So i assume the 4 gb limit was reached before the 12 minute limit in every case.
I was pointing camera at a tv screen.
They are one and the same thing. 4gb = 12 minutes because codec is set up to do CBR so it's predictable what length you'll get..

Setting the qscale in magic lantern to a lower value lets you record much longer - over half an hour if you don't mind the quality loss. You can choose a good trade off that suits you between clip length and quality. Qscale means going over to VBR, so it is not possible to determine the maximum clip length for a given setting, because it depends on the complexity of the images being recorded.

It seems Canon were not expecting Magic Lantern to achieve this ability, because while the 29 minute limit does exist in 640x480 mode (tax reasons), it has not been applied in 1080 mode :)
James Donnelly is offline   Reply With Quote
Old February 2nd, 2011, 02:25 PM   #19
Major Player
 
Join Date: May 2007
Location: Ireland
Posts: 579
Thanks for that James.
Could you tell me James what qscale value equates approx. to the default CBR bitrate from Canon?
Ger Griffin is offline   Reply With Quote
Old February 3rd, 2011, 06:07 PM   #20
Major Player
 
Join Date: Jul 2008
Location: Glasgow, Scotland, UK
Posts: 309
So is the continious recording feature in the latest stable version of Magic Lantern?

This almost sounds too good to be true

I was just about to buy a small camcorder to leave up the back, but with ML I can just use my 550d?

too good to be true?
James Strange is offline   Reply With Quote
Old February 3rd, 2011, 06:17 PM   #21
Major Player
 
Join Date: Jan 2004
Location: Cornwall UK
Posts: 793
It is not totally continous recording, there is a gap of about 1.5 seconds before the next clip starts recording. I tested this with a digital stopwatch, so beware if you are syncing 2 cameras. Its to long a gap to use for anything like a wedding ceremony, but still very handy for a lot of uses. The 29 min 59 second limit does apply to 1080 clips. I have tried all the lower minus settings and every clip is exactly 29 mins 59 seconds long. Simply go to the last frame of the clip to get the length of it.
__________________
Colin
Colin Rowe is offline   Reply With Quote
Old February 3rd, 2011, 06:21 PM   #22
Major Player
 
Join Date: Jan 2004
Location: Cornwall UK
Posts: 793
Quote:
Originally Posted by Ger Griffin View Post
Thanks for that James.
Could you tell me James what qscale value equates approx. to the default CBR bitrate from Canon?
-1: 8.8 Mb/s
-2: 9.6 Mb/s
-3: 11.8 Mb/s
-4: 13.9 Mb/s
-5: 15.0 Mb/s
-6: 17.1 Mb/s
-7: 21.0 Mb/s
-8: 24.3 Mb/s
-9: 29.6 Mb/s
-10: 35.3 Mb/s
-11: 42.0 Mb/s
-12: 48.0 Mb/s
-13: 56.3 Mb/s
-14: 64.2 Mb/s (flashes overheating icon and stops recording after 2 seconds)
-15: 67.5 Mb/s (flashes overheating icon and stops recording after 2 seconds)
-16: 86.7 Mb/s (flashes overheating icon and stops recording after 2 seconds)


Hope this helps
__________________
Colin
Colin Rowe is offline   Reply With Quote
Old February 3rd, 2011, 07:48 PM   #23
Major Player
 
Join Date: Jul 2008
Location: Glasgow, Scotland, UK
Posts: 309
thats great to know, i would use the 550d ad a c-cam up the back of the church, getting a wide, so I can deal with the 2 sec gap between 12min / 4gig clips.,

Now to install ML on my 550d,

is the continious rec feature in the latest stable version? I dont see it mentioned on th page

550D - Magic Lantern Firmware Wiki


?
James Strange is offline   Reply With Quote
Old February 3rd, 2011, 09:25 PM   #24
Inner Circle
 
Join Date: Nov 2005
Location: Elk Grove CA
Posts: 6,838
Quote:
Originally Posted by Russ Ivey View Post
Chris, can you elaborate on what you mean by "false colors"? What does this feature do exactly and what does it show?
Russ, sorry I missed your query earlier.

False colors is another way of judging proper exposure. Advanced monitors and cameras have this feature. I first ran into on my Marshall monitor, and found it resolve a lot problems with trying to guess how the image was going to be exposed. Essentially it converts the image into zones of lighting that tell you what a particular part of the image is being exposed at in IRE.

The zones break down as shown on the attached chart. I understand that you want your lighter faces to come in around 55 to 60. You want to keep your images out the red because of clipping, and also out of fushcia to avoid loss of shadow detail.

While in ML and using movie mode, you just have to press and hold the flash button on the top left of the prism housing.
Attached Thumbnails
magic lantern kelvin wb-falsecolorkey.jpg  
__________________
Chris J. Barcellos
Chris Barcellos is offline   Reply With Quote
Old February 4th, 2011, 09:49 AM   #25
Major Player
 
Join Date: May 2007
Location: Ireland
Posts: 579
It really is great guys isn't it. There hasnt been a very big deal made out of continuos record.
I suppose it hasnt been a big deal for movie makers.
But for us event guys, its a game changer.

Thanks for the bitrate breakdown Colin.

This is the latest version as far as im aware, stable too.
Magic Lantern 0.2.0 RC1 for 550D firmware 1.0.9 - Magic Lantern firmware development | Google Groups
Ger Griffin is offline   Reply With Quote
Old February 4th, 2011, 10:16 AM   #26
Major Player
 
Join Date: May 2007
Location: Ireland
Posts: 579
False colours looks like something worth familiarizing myself with. Thanks Chris
Ger Griffin is offline   Reply With Quote
Old February 6th, 2011, 10:01 AM   #27
Major Player
 
Join Date: Apr 2010
Location: Chelmsford England
Posts: 287
Quote:
Originally Posted by Colin Rowe View Post
It is not totally continous recording, there is a gap of about 1.5 seconds before the next clip starts recording. I tested this with a digital stopwatch, so beware if you are syncing 2 cameras. Its to long a gap to use for anything like a wedding ceremony, but still very handy for a lot of uses. The 29 min 59 second limit does apply to 1080 clips. I have tried all the lower minus settings and every clip is exactly 29 mins 59 seconds long. Simply go to the last frame of the clip to get the length of it.
I can confirm the 29.59 limit applies to my 550d too, despite earlier claiming that the clip length restriction did not apply to 1080p recording.

I was basing my statement on the Trammell Hudson interview where he made the comment that this was the case. I guess he must have been referring to the behaviour of the 5d.
James Donnelly is offline   Reply With Quote
Old February 6th, 2011, 12:35 PM   #28
Regular Crew
 
Join Date: Sep 2009
Location: London Ontario
Posts: 94
Using the Jan 22 build myself and really love ML. Simply amazing. Have toyed with a few of the features, but really wanted to kill AGC first. Will probably get a Juiced Link to keep in camera gain low.
__________________
Regards,
Thane Silliker, London, Ontario
Thane Silliker is offline   Reply With Quote
Old February 9th, 2011, 07:33 PM   #29
Inner Circle
 
Join Date: Nov 2005
Location: Elk Grove CA
Posts: 6,838
False colors

Follow up on False Colors:

In the first addition of false colors, in order to get proper false color readings, we were told we had to press the play back button once. Then exit. I thought that had been fixed but it appears not. So after staring ML, and before actually using, just hit the play button (>) once and exit it, and your false colors will be a go for the session.
__________________
Chris J. Barcellos
Chris Barcellos 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 12:02 AM.


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