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#apertus IRC Channel Logs

2016/10/09

Timezone: UTC


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Bertl_zZ
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12:28
Bertl
morning folks!
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niemand
Bertl, is 720p30 also possible as output? (not now, but for the event)
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14:04
Bertl
it would be doable, yes
14:05
Bertl
the HDMI output sequencer is configurable, so you can program it to output 720p as well
14:07
Bertl
or do you mean 1080p and 720p in parallel?
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niemand
Bertl, only 720p
14:08
Bertl
okay, yes, that should be rather simple, just needs some testing
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se6astian|away
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16:04
niemand
axiom beta -> decklink capture cards is not really working ...
16:04
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16:05
niemand
With a usb caputure card it works (1080p30 only), with a monitor it worked with 1080p60.
16:06
niemand
and currently I see a green image but with the correct axiom beta overlay. what could cause this, Bertl?
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16:13
niemand
okay with the decklink mini recorder we only get red and green tones, with a correct overlay. With a blackmagic pocket camera it works fine, also with intensity shuttle as capture card via usb.
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kaiserlich
long time, no see ^^
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17:32
Bertl
niemand: the axiom overlay is white, but the image is green?
17:32
Bertl
kaiserlich: welcome back!
17:32
kaiserlich
(:
17:32
kaiserlich
hi hi
17:33
Bertl
niemand: the overlay is combined before the TMDS (HDMI) encoding happens, so if that works, then you just managed to configure the matrix or output LUTs in an unfortunate way
17:34
Bertl
matrix and LUTs do not affect the overlay, only the image from the sensor
17:38
niemand
turns out, the image is there, but only in green and red
17:38
Bertl
maybe you just think that the overlay is correct
17:39
Bertl
in any case, make sure that you are capturing RGB444 not YCrCb or any subsampling
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17:40
Bertl
as I said, the (sensor) image is processed by the matrix and gamma LUTs, and then combined with the overlay
17:40
Bertl
once that is done, the resulting RGB 8bit values are encoded for HDMI
17:41
niemand
yes, the sensor is ok
17:41
niemand
we havent experimented with luts etc. yet
17:41
Bertl
so if the overlay is correct, then the 'processed' sensor image has to be fine as well
17:42
Bertl
btw, you can simply try with loading a few overlays or even images from SD card
17:42
niemand
is suspect the subsampling, but needs to be investigated.
17:42
niemand
s/is/i/
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17:43
Bertl
if you have a specific recording system you want to be tested with the camera, the best way is to send it to us and we will check it
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niemand
We can't set the subsampling in the card for the input.
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17:50
niemand
Axiom beta 1080p30 HDMI -> Decklink mini recorder: rosa/gruen
17:50
niemand
Axiom beta 1080p30 HDMI -> intensity shuttle HDMI out -> decklink mini recorder: works
17:51
niemand
other cameras work, directly connected to the decklink mini recorder
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17:54
niemand
with some other capture cards it doesn't work at all
17:56
niemand
the intensity pro 4k and studio
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niemand
this is probably hard to debug as you can't look into the capture cards
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18:06
Spirit532
probably some deviation from spec/standard
18:17
niemand
because it's HDMI
18:18
niemand
we never expected that everything works out of the box
18:24
niemand
Bertl, would it be possible to output the stream encoded via ethernet?
18:32
niemand
This is what I get: https://sebix.at/tmp/axom_decklink_mini_recorder.jpg
18:33
Spirit532
niemand, you could stream via ethernet
18:33
Spirit532
but
18:33
Spirit532
the speed won't be pretty
18:34
niemand
Spirit532, can axiom encode to mpeg/h.264?
18:34
Spirit532
it's got an FPGA
18:34
Spirit532
it can encode into alien communications if you can write a core
18:36
niemand
but i dont know if the encoder runs on the fpga. if it does, great :) would be much less problematic
18:37
Spirit532
there is no encoder.
18:37
Spirit532
you have to make one.
18:41
niemand
is it possible to set the shutter speed?
18:45
se6astian
yes, you set the shutter through the exposure time
18:45
se6astian
see cmv_snap3 in wiki
18:45
niemand
no, for video
18:46
niemand
And how to set the gamma curve for the beta? I only found this for alpha: https://wiki.apertus.org/index.php/Axiom_Alpha_Software#LUTs
18:46
niemand
we currently have ~10fps
19:04
niemand
theory by clemens: is the blue led flashing with the same rate as the fps?
19:08
Bertl
okay, no, streaming via gigabit ethernet is not a good option
19:08
Bertl
encoding on the Beta is doable, but consumes a lot of resources and probably won't work above full HD
19:08
niemand
with 720p?
19:09
Bertl
regarding shutter, you set the exposure time and the sequencer alignes the exposures with the HDMI frame rate
19:09
Bertl
so, if you have 60 FPS HDMI output, you can get 60 or 30 or 15 or 10 ... FPS
19:10
Bertl
the actual output frame rate is determined by the exposre plus transfer time
19:10
Bertl
and yes, the blue LED flashes for each frame :)
19:10
Bertl
for the gamma curve, there is a shell script and a C tool which adjusts the LUTs
19:11
Bertl
regarding encoding, there is no available solution at the moment, so somebody would have to write it
19:12
niemand
what are these scripts and tools for the gamma curve?
19:13
niemand
is it possible to get the current frame rate?
19:15
Bertl
btw, the image you linked looks like YCrCb
19:16
niemand
can the axiom send in this mode?
19:16
Bertl
lut_conf3 is the C tool to set any LUTs including the gamma LUTs
19:16
Bertl
and gamma_conf.sh is the script which allows to set gamma values and program the gamma LUTs
19:17
Bertl
@YCrCb no, not yet, but it would be possible to add a conversion if necessary
19:17
Bertl
currently we only generate RGB444
19:19
niemand
ah, pmem is ./pmem
19:20
niemand
just fixed this in the wiki
19:21
niemand
Hm, "./lut_conf3 -r < /tmp/lut.save" says "mapped .." but doesnt exit.
19:34
Bertl
careful with changes to the wiki, this is for the Alpha
19:34
Bertl
i.e. don't change anything you haven't verified on an AXIOM Alpha :)
19:34
Bertl
best would be to make a similar page for the Beta and adjust it there
19:36
niemand
it doesnt work either
19:44
Bertl
what doesn't work?
19:45
niemand
./lut_conf3
19:51
niemand
off for now/today
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se6astian
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22:21
Bertl
off to bed now ... have a good one everyone!
22:21
Bertl
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