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#apertus IRC Channel Logs

2024/01/24

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balrog
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18:54
BogdanXOR
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18:56
BogdanXOR
hello Apertus, it's been a while
18:58
BogdanXOR
hey Bertl, I would need your help at your earliest convenience
18:59
BogdanXOR
long story short, trying to use (Atomos) Ninja V+ with the Axiom Beta, but the image I'm getting is in between Green (highlights) and Pink (darks) - rest assured it's not a false color situation
19:00
BogdanXOR
I have a feeling a config like the one we did (or rather you distilled) for SHOGUN is required
19:00
Bertl
hey BogdanXOR! :)
19:01
BogdanXOR
I could crunch at it, but I'm not sure where I could find the documentation for the `scn_reg`isters
19:01
BogdanXOR
and I'm ofc unsure what the root cause is, to know which registers to tweak (i.e. where to start off)
19:01
BogdanXOR
I've posted photos and all the tests I did before I came to the conclusion of doing `scn_reg` dance over to the Telegram channel
19:03
Bertl
well, what firmware and settings are you using?
19:04
Bertl
btw, green highlights and pink darks sounds a little bit like YCbCr (YUV) vs RGB
19:16
BogdanXOR
yes, YCbCr expectation on the Ninja side was the hypothesis brought forward by Jaro on Telegram
19:16
BogdanXOR
he suggested an axiom_mat4_conf invocation to try and fix it - I tried it but to no avail (the behaviour looks the same on the Ninja)
19:17
se6astian
BogdanXOR also asked about the specific scn_reg HDMI registers background: like what the hdisp_s corresepond to
19:17
se6astian
what values to cycles through and what parameters are more likely to vary
19:17
BogdanXOR
Switching to the Shogun I could see the image just fine, albeit more green than before
19:18
BogdanXOR
as for firmware, v2, as for settings the defaults (normal mode and SHOGUN generator init, as far as I could tell from the scripts)
19:19
Bertl
well, basically nothing you can adjust on the SCN registers (scan generator) will make the Ninja V+ switch from YCbCr to RGB
19:20
Bertl
(unless there are weird bugs in the HDMI chip they are using :)
19:20
BogdanXOR
and I assume getting the Axiom Beta to send YCbCr is more complex than just that matrix transform(?)
19:21
Bertl
the RGB to YCbCr conversion is actually a 'simple' matrix transform
19:22
BogdanXOR
yes - I'm just thinking there maybe needs some additional signaling (metadata(?)) to be sent as well
19:22
Bertl
so with the proper settings, it should be possible to do that, but usually there is another problem here
19:23
Bertl
YCbCr color spaces usually compress the croma information
19:23
BogdanXOR
yes, I'm aware
19:23
BogdanXOR
or I remember it
19:23
BogdanXOR
that's why 422 subsampling exists, I think
19:23
Bertl
assuming that the Ninja V+ can handle RGB data
19:24
Bertl
I would first look for a way to manually force the device to interpret the data as RGB instead of YCbCr
19:24
BogdanXOR
Ninja V+ can even do RAW, but ofc it's not immediately clear what handshake it expects
19:26
BogdanXOR
I did some searching (a bit), but there doesn't seem to be anything about it (or it's hidden because of the damn rgb parade or similar rgb functionality that the device has)
19:29
Bertl
so coming back to the firmware, you are on 2.x you say?
19:34
Bertl
try to change the following line in axiom_setup.sh
19:34
se6astian
yes BogdanXOR is on V2 and was instructed to alter the setup axiom_start script to try the different gen_init.sh parameters already
19:34
se6astian
SHOGUN, 1080p60, etc.
19:34
Bertl
(should be line 15)
19:34
BogdanXOR
yes - version the CLI welcome message reports is: 2f3a291c-dirty
19:34
Bertl
[ "$MODE" == "normal" ] && axiom_gen_init.sh SHOGUN
19:34
Bertl
change that to
19:34
Bertl
[ "$MODE" == "normal" ] && axiom_gen_init.sh 1080p60
19:38
BogdanXOR
so I tried that before by commenting lines 15:16 and uncommenting the lines just before that - and the behavior is the same, with an added vertical image flickering like on the old TVs that are not in tune with the display frequency
19:39
BogdanXOR
and I tried it now again precisely as you described it and it's the same
19:40
Bertl
okay, so the Ninja V+ has a similar (weird) chip as the SHOGUN
19:40
Bertl
(or HDMI IP :)
19:40
BogdanXOR
video of the behaviour: https://t.me/apertus/5350
19:41
BogdanXOR
it runs in the family, would doubt they give up their shennanigans :))
19:42
BogdanXOR
unsure if related, but now the CLI through minicom is not responding :))
19:43
BogdanXOR
same for screen
19:43
Bertl
not related unless you messed something up with the script :)
19:44
BogdanXOR
I've seen before some weird behaviour with vim on the system, so not surprised - unsure if it was due to my direct action, tend to think I didn't fuck up, but who knows
19:45
BogdanXOR
anywho, will do a nasty reboot and if not will do a reflash
19:46
se6astian
btw BogdanXORit would be great if we add/document the findings on the wiki
19:47
se6astian
do you have a wiki account already?
19:47
se6astian
as we were flooded with spam accounts and mediawiki countermeasures were/are severly lacking we had to disable user registration and create accounts manually
19:51
BogdanXOR
don't remember if I do, but will check
19:53
BogdanXOR
in any case, don't worry, will go through Telegram and IRC and put relevant info and conclusions in wiki
19:53
BogdanXOR
right now it almost feel the only thing we can conclude is that NINJA V+ sucks :))
19:54
BogdanXOR
*feels
19:54
se6astian
:P
19:54
Bertl
well, it is certainly a little weird
19:55
BogdanXOR
maybe I should re-check my NINJA with another camera, just to make sure
20:01
Bertl
can't hurt to do that
20:01
BogdanXOR
Ninja V+ with officially-supported camera (Fuji X-H2s): https://t.me/apertus/5351
20:01
BogdanXOR
i.e. works fine
20:02
BogdanXOR
all colors are reproducing well, no pink, no green, not even a cast of it
20:06
Bertl
well, send one over and I promise I'll take a look :)
20:07
BogdanXOR
can send you mine. do you think you need the camera as well?
20:07
Bertl
nah, I have an AXIOM Beta here for testing, so no problem with that
20:10
BogdanXOR
at the same address as in 2018?
20:10
Bertl
probably, let's double check in pm