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#apertus IRC Channel Logs

2014/03/23

Timezone: UTC


01:13
Bertl
off to bed now ... have a good one everyone!
01:38
gcolburn
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03:38
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03:44
aombk
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09:40
se6astian
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09:41
se6astian
good morning
09:58
Bertl
morning folks!
10:24
danieel
i would wonder what is the preferred medium for 4k raws :) playing with it internally in a pc is okay, but to actually put the data onto something else is insanely slow
10:28
se6astian
what are you trying to do exactly?
10:29
danieel
e.g. take the footage to postproduction site
10:29
danieel
if it takes 12h to put it on a usb drive, it will take another 12 on that site to offload it
10:29
se6astian
so why not carry it to them?
10:29
rexbron
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10:30
danieel
wasted 24 hours, by using "consumer media"
10:30
danieel
anything better out there?
10:30
Bertl
high speed striped SSDs :)
10:34
danieel
then there is a questions if taking a whole NAS would not be simpler
10:34
danieel
e.g. on 10GE
10:35
danieel
i saw recently a mobo with onboard 10GE, for lowpower xeons
10:35
Bertl
probably depends, if the SSDs are 1.8", 4 or 5 of them might still be easier to transport
10:36
danieel
but you have to agree on raid type / strip files in round robin fashion.. and also on filesystem
10:37
Bertl
similar for the NAS
10:37
danieel
can share both nfs and samba...
10:37
danieel
or iscsi
10:37
danieel
better than trying to put ext4 drive into windows :)
10:37
Bertl
still you have to agree on one :)
10:37
danieel
at nas, it can coexist, at drive the FS is one time choice
10:38
Bertl
depends on the filesystems
10:45
rexbron
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10:56
danieel
and one more thing worries me - sending media abroad
10:56
danieel
how to avoid taxation on both ends upon receipt of the item
10:57
danieel
as the primary reason is to transfer data, not the actual hardware
12:01
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13:11
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15:22
intracube
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16:33
troy_s
danieel: Disks.
16:34
troy_s
danieel: Basically SSDs as Bertl said. Mostly proprietary.
16:52
danieel
proprietary like those from field recorders?
16:59
troy_s
danieel: Similar. Google Alexa Codex (now onboard) or look through the Sony site for the F65 / F55 disks.
17:01
intracube
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17:03
danieel
the sony system does compress the content?
17:04
danieel
2.4gbps write speed for AXS-512 does not handle 4k 16bit
17:20
troy_s
danieel: The Sony system handles native 4k fine (native 6k Bayer)
17:23
danieel
i see, they use some lossy compression
17:24
danieel
"Choice of F65RAW-SQ mode with mild 3.6:1 compression or F65RAW-Lite mode with 6:1 compression "
17:25
danieel
so same as red, wavelet based compression
17:51
troy_s
danieel: Never shoot the compressed modes.
17:52
troy_s
danieel: Only time it comes up is for high frame rate.
17:52
troy_s
danieel: And even then the vfx folks get grumpy.
17:56
danieel
got some raw frame from f65? the few googlable ones are from blender and are jpegs
17:58
troy_s
danieel: Won't do you any good. The raw format is a blob.
17:59
danieel
i meant some tiff export, with 2.2 gamma (no color matrix needed) - just to judge the noise/blur
18:00
troy_s
You never find 2.2
18:00
troy_s
Only logs as
18:00
troy_s
I think the options are linear exrs or Cineons
18:00
danieel
ah, i thought linear16bit is default
18:00
troy_s
danieel: You can find Blender exrs
18:01
troy_s
danieel: But you can't judge noise without the color transform
18:01
troy_s
(and even then shooter ability has an impact)
18:06
danieel
downloading the mxf from blender... we'll see
18:08
danieel
there was some time back a discussion on file per frame, or file per shot - (e.g. dng is frame=file) ... the benefit of single blob is that it is easier to copy continuously
18:09
danieel
e.g. total commander in windows will copy my dngs in random order if i copy a folder
18:09
danieel
that makes the data on the destination disc scattered
18:10
Bertl
maybe 'total commander' isn't the best tool then :)
18:11
danieel
i wanted to point out that such things happen - i would not expect it
18:11
danieel
anyway it is random in mc too :)
18:14
Bertl
maybe 'mc' isn't the best tool either :)
18:53
danieel
the half-float type in exr is quite ugly... on strong gradients it shows posterization
18:57
danieel
and the sensor is still quite noisy on the green screen - but hard to tell if that is due to noise amplification by the half-float
18:58
Bertl
well, what do you expect from 10bit
18:59
danieel
if the sensor can deliver 16bit linear, i would wonder why they used the 10bit float afterwards
19:03
Bertl
which sensor?
19:03
danieel
f65
19:04
Bertl
how do you know the sensor can do 16bit linear ?
19:04
danieel
sony states 16bit linear storage...
19:05
Bertl
storage, yes, but sensor?
19:31
troy_s
danieel: Uh what?
19:31
troy_s
danieel: Gradients are fine in half.
19:31
troy_s
danieel: Remember too, that you have to account for knowledge gaps.
19:32
troy_s
danieel: And the "noise" can only be evaluated after a color transform.
19:32
troy_s
danieel: Remember that judging noise is purely a measure of distance between values, and a color transform impacts that quite immensely.
19:33
troy_s
(And the levels the greens were exposed to etc.)
19:33
troy_s
IIRC the EXRs may not be raw dumps from the software. I cannot remember entirely.
19:33
troy_s
But if they are raw dumps from the software, then you _must_ use the ACES RRTs and such for viewing.
19:34
troy_s
If they are not, all bets are off and the data isn't terribly useful to evaluate, as I remember the primaries were used but the RRTs have some perceptual adjustments that smooth out nuances of the ACES color space.
19:34
troy_s
TL;DR Don't read too much into the EXRs as it was a learning experience.
19:35
troy_s
(And I have no clue how you are viewing the EXRs, and that can be at least as important)
21:37
se6astian
time for bed
21:37
se6astian
good night
21:37
se6astian
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