Crossfire variation 2 'Green Screen matrix' Featuring a tighter quantisation in the Chroma Red and Chroma Blue plus work on the Luma settings. Its a Q20 VBR setting, all buffers perfectly constant, with High Intra settings on 24p and HBR modes. Detail will use bitrate accordingly. Good for Green Screen, I prefer ISO 320 or 160 along with Standard picture profile on the camera. Give it a test and report back as usual.

Hello to everyone and to @thepalalias, how is it all going? I dont know if anyone gotten my previous comment but I was just surprised to see how much has moved on and how much I missed.

Picking up where I left off quite awhile ago here:

http://www.personal-view.com/talks/discussion/comment/57689#Comment_57689

I have finally gotten around to applying Sedna Q20 C, BUT the recordings still keep halting after a few seconds on the Manual Movie Modes (1080i50)! And yes, I have been using my Sandisk 16GB 95Mb/s card :(

Now, I saw the Quantum 9b Updated and I thought I would give that a go, and interstingly enough in Manual Movie Mode, it actually was going on for abit longer than i thought compared to Sedna Q20 alone, still it did stop but after a few minutes, althought this was more positive results, it was not what I was looking for.

You also mentioned in your comment there that it was all down to programming on the Manual Movie Mode which was designed to work at lower bitrates than 24H, has there by ay chance managed to resolve this by now? If not, what would have to be done exactly? Cant someone take the Cinema Mode but for it to capture at 50i instead? :D

I hope all understands what I mean, because of this, a couple of my assignments had to be recorded in 24p inorder to get long recordings, but I dont like the fact I am using 1/50th of a shutter speed with it, it really looks odd.

@terry2 Aside from Nostalgic, which has a warm-to-yellowish look, all GH2 Film Modes have a greenish tint. In Smooth Film Mode, I use the White Balance adjustment to add an M-3 correction in-camera.

@driftwood - "Increasing the quantisation entries (thereby reducing the entries down from 255) of Cr and Cb in the scaling tables can help take out more of the green chrominance."

While this would certainly increase the quantization precision of Cr and Cb luma components, it won't have any effect on the relative balance of green versus red and blue components. Color balance is determined by Film Mode settings, the Quantization Matrix affects only the precision with which color components are encoded.

this is shot with cluster 4

only with 2 different CCTV 25mm 1.4 / 1.2 and slrmagic 12mm 1.6

I wanted something very dirt - 800 ISO to have the right noise and 1/100 of course

CC: just some raw curves correction and maybe a contrast mask

overall satisfied, thanks @VK, thanks @driftwood

@driftwood Hi Nick, about Crossfire ver.2 shouldn't be the other way around? I mean reducing the green and have more blue and red infos? Unless I didn't get it right. I mean, doesn't the gh2 record too much of green and low red, and that's one of the reason of banding (I know the main is the 8bit) and, sometimes, weird skin tones?

The next variation of Crossfire (variation 2) will feature the unreleased Canis Majoris 'Green Screen matrix' coming later today with adaptive VBR quantisation and will span on tested 30Mb/s 16GB cards at 24p intra (avg 100M to 140M tops). It will feature Intra HBR 25p/30p (avg nearly 50M to 80M tops), and 3 GOP 720p modes (Avg nearly 60-80M).

Ive tried reducing the green spill in chrominance and luminance - balancing out more of the chroma Reds and Blue sections of the quantisation matrix. The adjustments have taken considerable study using photoshop 'levels' to identify areas where a combination of settings in the red and blue levels will compensate green saturation. With my own tests I have found keying in FCP and indeed the Keyer in fcpx works very well with a 'chroma key green' material using this matrix without destroying skin tones.

What sort of detail is being filmed? Or, are you saying it just stops after a certain length of time when it runs out of steam?

I need someone to look at a few tests: Can someone verify for me max span lengths for STOCK settings at HBR modes for both 30p and 25p. Thanks.

@Driftwood Cluster v4 12/15GOP Tried both H24 and HBR (Pal) on a 30mbs Sandisk Extreme HD and 45mbs Sandisk Extreme cards and never spanned, both stop at 4Gbs HBR (Pal) 16mins09secs H24 12mins50secs. Looks like I will have to get some faster Cards or keep the shots short, shame as Work has loads of 16Gb and 32Gb 30mbs and 45mbs cards for me to use. Oh and I was using a nikon 50mm f1.4 head shot Craig R

@Driftwood The colors looked pretty good. I'll have to try to get some deeper reds later.

As 2k on mjpeg is just an upsample and 30p, what's the advantage towards avcintra setting? Also, to all you guys experience, which has better skintone and makeup shades handling between crossfire and cluster v4? And what's the best color setting (normal, vivid, smooth) to reduce banding while still have decent colors? Thank you all and especially to Driftwood.

Trying to decide which framerate to shoot at, i'm testing sedna aq1 c,cluster v4 3 gop among other settings.. Except stability,are there any quality differences between hbr 25p and 30p and between 720 50p and 60p for these 2 settings i mentioned? If not,i'll save some time from testing both(pal &ntsc modes) in each setting..