Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - araucaria

Pages: [1] 2 3 ... 6
1
Quote
Audionut:
Is the code just truncating bits, or is it compressing them into the remaining?

edit:  The OP states that the bits are being compressed.

Curious to know what kind of compression it is. Great work, I'm very excited.

2
Camera Emergency Department / Re: Recovering from failed FW update.
« on: January 05, 2016, 04:17:01 PM »
I think there was no ML installed ever  :-[

3
Camera Emergency Department / Recovering from failed FW update.
« on: January 05, 2016, 03:11:47 PM »
A friend updated a 5d mkii with the official update but the battery connector seems to be giving some trouble. The update has frozen and now the camera won't work.
Is there a way to fix this or will he have to send it to canon?

Best Regards ;)

4
Raw Video / Re: [spanish] Canon 7D 2.5K RAW VIDEO
« on: July 10, 2014, 06:28:13 PM »
lol spanish...

5
General Chat / Re: Naive question regarding bitdepth
« on: March 02, 2014, 02:04:59 AM »
Every resulting nonraw image is made of 4 bayer pixels merged into 1 pixel. A Red a Green a Green and a Blue.
That's what I thought, but it's not.

Resulting image is 100x100pixels, then you have 100x100pixels on the sensor, the missing color information is borrowed from the neighbour pixels. I thought there were 400x400 pixels for a 100x100 image ^^'

This makes me wonder if there is any software where I could open a raw file and there will be no debayer guessing, just summing together 3 pixels to get RGB with the 4rth G to help reduce noise. Or is this just stupid?

6
General Chat / Re: Naive question regarding bitdepth
« on: March 02, 2014, 01:19:38 AM »
Thanks for the answer, I actually had a completle wrong idea about how the bayer sensor worked, you made me read it again. Actually I thought every pixel was made of four single pixels... now I feel really stupid.

7
General Chat / Naive question regarding bitdepth
« on: March 01, 2014, 11:22:07 PM »
Please have mercy I have a very basic question.

When this raw craze started I was always calulating the speed requirements for certain resolutions so I knew which card I could use and which not.

X(pixels)*Y(pixels)*14(bit)*24(fps)/[8*2^20] would give me the Megabytes/second I would need. This actually worked.

I never thought much about it, but today I wondered that if it is 14bit/per sensel,shouldn't it be 4 times more data?

Any idea?

8
Tragic Lantern / Re: 50D Raw video
« on: February 25, 2014, 12:54:08 AM »
Hey guys, I haven't been using my 50d for quite some time so today I installed the latest release and loaded the raw module. The problem is that I can't get over 180º shutter (maybe it was a little more, don't remember). I remember being able to use up to 1/2000 speed a few months ago. What am I doing wrong? Thanks

9
General Development / Re: Anti Aliasing - crazy idea (script?)
« on: November 05, 2013, 02:02:32 AM »
It's there but you don't notice it that much because of the muddy h264 processing.

10
General Development / Re: Anti Aliasing - crazy idea (script?)
« on: November 04, 2013, 11:11:47 PM »
The problem is that it skips sensels and not whole pixels. This methods avoids harsh aliasing (like with the nikon d90, which skipped whole pixel lines). So the camera skips this way:
R G
G B
R G
G B
R G
G B
R G
G B

So when you have an area with a lot of contrast the bright part (a fine dark grass leaf with sky behind) the sky gets read by RG and the dark leaf gets read by GB, so when it debayers the sensels it turns out like a red magenta one. Same happens when the bright falls on GB and the dark on RG, you will get a blue pixel.
There is no way to avoid this, interpolating pixels would only help against stairstepping aliasing but I didn't find that one too bad on the 50D.

Correct me if I'm wrong :D

11
Tragic Lantern / Re: 50D and 40D Raw video
« on: November 02, 2013, 02:39:33 AM »
i think it would be cool if some of the companys made adapter for ml crop modes to match focal lenght of non crop one,  like taking lens closer to the sensor with magnifying glass or something(like fx and dx lenses)
It exists and they call it "speed booster" but the flange distance is too big to do so on canons.

12
Tragic Lantern / Re: 50D and 40D Raw video
« on: October 27, 2013, 03:41:49 AM »
What is the algorythm of calculating the size (in bytes) of the one minute video file depending on the video resolution? Is that, for instance, (1592*1062*14*24*60)/8?
That multiplication looks allright.

13
Raw Video / Re: 16bit or 8bit workflow in after effects
« on: October 26, 2013, 07:09:20 PM »
If you are working with luts these can vary when choosing different bitdepth. I usually go with 16bit in ACR and 16 bit in AE project settings.

14
General Help Q&A / Re: can ML corrupt a cf card?
« on: October 26, 2013, 07:07:44 PM »
Get a good cardreader (ask other people), and do not cut and paste (or delete files without formatting afterwards),just copy and then format in camera.

15
Raw Video / Re: 6D and moirè in RAW video
« on: October 10, 2013, 01:45:41 PM »
Zoom in while in live view gives you 5x crop which has no moire, this has been discussed a 1000 times.
There are a lot of topics about moire, read them.

16
Tragic Lantern / Re: 50D and 40D Raw video
« on: October 07, 2013, 01:46:38 AM »
@araucaria  Please don't take this the wrong way.  I am not knocking the GH2, GH3 or any other consumer H.264 video camera.  I have a couple.  For many types of situations they are perfect. 

However, there are many people who have only shot with a GH2 and don't understand how RAW video is different, much different.  Each frame of the 50D is say 1728x972, or 1,679,616 pixels.  Each pixel (red, green or blue) has a value of 256, 1 byte.  There are 24 frames a second, or 40 megabytes per second.  That is all real color information. 

Even when the GH2 is running the highest bitrate hack, it's at 175Mbits, that's BITs not BYTES.  In bytes that 175/8 or 22 Megabytes.

How can a camera that saves 22 megabytes of color data per second match a 40 megabyte camera?  There are many people that would argue that those numbers are distorted (the 50D can actually go quite higher).  In any case, no one would question the dynamic range difference between the cameras.

Again, I'm not saying one can't shoot great video with the GH2.  Many have.  But it's dis-information to say one can get the same  dynamic range with a GH2 over a 50D.  You can't grade in color data that just isn't there.  This is obvious to anyone who has shot both. 

Again, not saying your advice, in general, isn't good.  It may be the best advice for that reader.

Ehm, I think it was pretty clear we were talking about compressed footage downloaded from vimeo... Btw, where do the 150 pixels for 1728x972 come from? Anyway, the GH2 is better in everything but color depth and dynamic range (but only because you loose a lot when compressing) when compared to the 50d in raw mode. The gh2 is definitely sharper and has no moire.

But hey, I don't have a gh2 but I do have a 50D because I like the color depth and the lack of compression, and specially because I hate the way you have to grade non raw stuff.

Quote
But it's dis-information to say one can get the same  dynamic range with a GH2 over a 50D
Where is this coming from?

17
Tragic Lantern / Re: 50D and 40D Raw video
« on: October 07, 2013, 12:17:58 AM »
Hey guys! Just joined to forum to say thanks to the guys who've been working so hard on the hacks. The developments are honestly amazing, I just sold me t3i and will be scooping up a 50d with some MF glass pretty soon.  :)

I downloaded a 50d movie earlier called "kiss" off vimeo and played around with the CC to see what I could do. Even after compression the flexibility is nuts.
Here's the original https://vimeo.com/67351221



I actually think that has more to do with the weather the video was shot (plus the not over graded footage). If you are fine with that kind of grading you could go with a panasonic gh2 or g6 and save yourself a lot of trouble.

18
Tragic Lantern / Re: 50D and 40D Raw video
« on: October 06, 2013, 11:44:45 AM »
Thanks for the info on the other cameras, still researching my options. 50d grading is a dream though, so I'm really leaning towards that at the moment. 

While I'm here, what's the highest resolution you guys have managed to record at if you had to record for 1min-1.5 min?  I'm using this camera for narrative film and I'd like to have semi-long takes as an option. And could I possible change the aspect ratio from 16:9 to something like 2:39:1 so I could record longer, while still having it look like a film? Apologize if these are stupid questions, still making my way through the scattered documentation!
You can do that with all resolutions as long as you got a good 1000x card. So you can film in maximum full crop resolution which is 1584*1030 (or something like that) and 1920x1080, the first one is perfectly continuous and the second one is almost continuous. So you will get a lot more than 1.5minutes.

19
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 26, 2013, 06:19:25 PM »
Picture style has no effect on Raw video, forget about it, you only need it for compressed normal 8bit h264 video which looks horrible on the 50d anyway.

20
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 26, 2013, 05:13:02 PM »
Yep, unless something magic happens, this is as far as it will go. What has been achieved is huge, now go and film actual stuff :p

21
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 21, 2013, 10:05:24 PM »
Well it squeezes und you just stretch it in post to unsqueeze ^^

22
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 21, 2013, 08:09:58 PM »
@araucaria thanks for heads-up and the pic. You got that lens for a steal of a price :D

Just out of curiosty, why did you shoot 1920 and not something closer to 1440 x 1080? Just wondering if that would change any of the characteristics of the unsqueezed imaged.

I'm a bit puzzled too about the noise you mentioned as it's still capturing pixels in crop and non-crop but one has skipping. Are you saying that lineskipping actually looks better than 1:1 crop video?  ???
Not really, the only diference is that the noise in lineskipping looks more static to me (I refer to normal luminosity noise, not with high isos and darkness).

Shooting at 1440x1080 looks exactly the same as if you crop the sides of the fullhd. The lens streches everything 2x in the wide, so if you shoot @ 500x1080p you will get 1000x1080p, but that image is exacly the same as if you shoot full 1920x1080p, stretch it to 3840x1080 and crop the sides to 1000. Yeah lol.

23
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 21, 2013, 06:08:18 PM »
Yes, h264 colors are very limited, I was refering to the problems of the 50D with aliasing and moire, they are a big deal, but hey, we are not doing hollywood stuff... Good color on the other hand is very important because it gives you the freedom to do what you want, even if it has some artifacts.

In h264 there is also compression, which gives turns some nice motion blur into something sturreing and ugly, shadows detail is a no go, not because noise but because of gigantic compression artifacts.

As for the nikons, I wish they had 10bit output over hdmi and a nice log-c curve, that would be enough. They certainly have the processing power but nikon is just too lazy (or handcuffed by sony).

24
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 21, 2013, 05:38:57 PM »
I suck at grading h264, I come from still photography and I am totally spoiled with raw, thats why I like ML raw. I have only nikon lenses (as I am a nikon shooter) and don't have Autofocus with them on the canon. If I had autofocus I think things would be a lot easier (not with double focus anamorphic but with the rest).
Since I don't do this as a Job I will just wait a year or more and see what happens (or if I get some spare money I'd just get a mk iii, and sell it when something better comes along), meanwhile I will deal with the 50D and it's problems (and pray for nikonhacker to get me raw video on the D800 and say goodbye to canon).
Anyway, I think 50D footage without crop shot trying to avoid moire and correcting it later in AE looks better than anything else we had in the amateur world before BMCC and ML RAW, So you can do a lot of things for the web, youtube and vimeo destroy your stuff anyway. And you can even make a small film with it, your audience won't notice, people watch screeners and xvid videos con 50" screens...

25
Tragic Lantern / Re: Raw video on 50d and 40d
« on: September 21, 2013, 04:02:24 PM »
I paid 100€ for that lens 3 weeks ago (the isco, my sankor was 150€ because I didn't want to wait). Anyway, if you are planning to use it in crop mode, I don't think it's worth the trouble (honestly) because on crop level there is a lot of noise and when you stretch it gets very noticable. It's also very hard to focus perfectly. Here is a quick sample, 28mm 1.4 lens @ f 5.6 with isco ultra star 2x shot at 1920x1080, overexposed to the max to get the noise out, and desqueezed streching horizontally. You can see its not easy to get good focus, the unstreched image looks fine but when you strech it you can see the focus errors pop out a lot.

Pages: [1] 2 3 ... 6