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5K 96fps 12:1 heavy macro blocking

Robino_J

Robino_J

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Shot in a forest yesterday (for a personal project thankfully) and some of the high speed 12:1 footage has real nasty compression / macro blocking.

I did a quick search on the forum and found some information about bad compression when shooting high contrast scenes at higher redcode ratios.

Check out this frame specially the tree trunk- is this normal or is there something wrong with my camera? (if it's normal then lesson learn :)

 
Send support ticket to red
camera log file
r3d snapshot
 
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I would decrease compression to see what that does as well though... 12 to 1 always looks fairly bad in most instances...
 
I really wouldn't go below 6:1 if you're shooting anything with a lot of small detail on MX (e.g. trees).
 
I shoot 5K 12:1 quite often for high speed and it usually looks great. Unfortunately I think David is right - you'll have to send in a support ticket and log file to RED.
 
Burke Doeren said:
I shoot 5K 12:1 quite often for high speed and it usually looks great. Unfortunately I think David is right - you'll have to send in a support ticket and log file to RED.
Click to expand...

I've had a lot of problems with trees at 8:1 before with a Scarlet MX at 4k.
 
Brandon J.F. said:
I really wouldn't go below 6:1 if you're shooting anything with a lot of small detail on MX (e.g. trees).
Click to expand...

Well said. I always remembered how on Prometheus they shot 5:1 normally, but whenever they had shots full of small detail (most often in Iceland, with all the mottled folliage and terrain)...they would shoot 3:1....for this very reason.
 
I always set compression to 3:1 , letting the camera use the best it can all the time. Why not ?
 
Op was filming high speed so in some cases 3:1 is not possible.
 
Exactly guys; if you're shooting 5K 96fps on any normal REDmag with an Epic MX, 12:1 is your best compression option. Either way, the point is that this macro blocking is not normal, and it needs to be analyzed by RED.
 
Cool.

No worries.

Hopefully he is sending this off to red to diagnose. 3:1 on Dragon is a bit of a hit data wise.
 
Not normal for sure. I shoot a lot of VFR / High Speed and sometimes at 18:1 (I know I know). This shouldn't happen.
 
I have ran into this quite often as well, always with high detail wide shots, in trees, with lots of light and dark areas. I found in many instances you would get better results by shooting high frame rates in 4k with less compression. However, if you find this to be a problem with your camera, please post about it because it is likely wrong with my cam as well (lol).
 
I am doing a lot of outdoor, I've sometimes come across some quite heavy artefacts (especially on trees) while shooting at high compression rates, but something like that is a bit too much.. I would be interested in RED's reply..

out of curiosity, what lens did you shoot it with?
 
Andrew Allsbury said:
I have ran into this quite often as well, always with high detail wide shots, in trees, with lots of light and dark areas. I found in many instances you would get better results by shooting high frame rates in 4k with less compression. However, if you find this to be a problem with your camera, please post about it because it is likely wrong with my cam as well (lol).
Click to expand...

Shooting at 4K with less compression is an interesting approach. Hadn't thought of that...
 
It's not macroblocking.
And please send it in.

But this is a textbook example of the situation where redcode at high compression rates struggles. That is a lot better on Dragon (Anyone remember Peters lovely film?)

High contrast, deppf focus, wide shot, rich details, tons of shades of green...
 
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