Current Server Time: 22:52 (Central Europe)

#apertus IRC Channel Logs

2018/05/03

Timezone: UTC


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seaman
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slikdigit
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04:46
Bertl_oO
off to bed now ... have a good one everyone!
04:46
Bertl_oO
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RexOrCine|away
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Bertl_zZ
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11:26
Bertl
morning folks!
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TofuLynx
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14:49
TofuLynx
Hello everyone!
14:52
comradekingu
TofuLynx: heia :)
14:52
TofuLynx
heia?
15:21
comradekingu
TofuLynx: It is what we say in Norway
15:24
ArunM
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LordVan
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15:28
TofuLynx
oh I see
15:28
TofuLynx
Heia :)
15:32
nmdis1999
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15:34
nmdis1999
Hey Bertl, I did tried to calculate image data size of Raw camera Image of pixel 4096*3072 pixels. It came out to be 18MB . For Grayscale 8 bit/pixel image it comes out to be approximately 12 MB
15:35
nmdis1999
What I know (if I am right) for finding bandwidth I'd need to know these three things: The pixel depth (bytes/pixel),
15:35
nmdis1999
The pixel clock rate of the camera (in MHz)
15:35
nmdis1999
and The number of taps
15:35
nmdis1999
let me know if I doing it right :)
15:36
nmdis1999
I'll probably write an article about what I understood till now
15:38
Bertl
taps?
15:40
Bertl
and yes, the frame size calculation is correct
15:40
nmdis1999
tap is kind of configuration
15:41
Bertl
like?
15:42
nmdis1999
wait a sec..I'll show you
15:43
nmdis1999
For example the tap is considered 1 if pixels per clock cycle is 1, 2 for when there are 2 pixels per clock cycle and so on..
15:44
nmdis1999
You can see more here http://download.gemscriptor.com/Euresys/html/99963.htm
15:44
Bertl
okay, that's something relevant/specific to camera link
15:45
Bertl
we don't have taps
15:45
nmdis1999
I see, so I'll probably don't take that into consideration then?
15:45
Bertl
the sensor has a number of LVDS channels (which mayb change) but those are not relevant for your puproses
15:45
Bertl
you are dealing with memory access, specifically DDR3 memory
15:46
Bertl
and you can benefit from utilizing the caches efficiently
15:47
nmdis1999
yes, also by calculating bandwidth and understanding if there's buffer overflow it might help?
15:47
Bertl
most likely we will have a system for you to test on tomorrow or after the weekend
15:47
Bertl
buffer overflow?
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www2
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15:48
supragya
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15:48
supragya
Good evening!
15:48
nmdis1999
what I read is that if FIFO required for one frame is greater than the on-board memory then we will experience buffer overflow
15:49
nmdis1999
Good evening supragya :)
15:49
Bertl
well, our FIFOs are all smaller than the on board memory ;-)
15:49
nmdis1999
cool :D
15:49
TofuLynx
Hello supragya!
15:50
Bertl
nmdis1999: don't worry about the data appearing in memory, this part is working just fine and is not related to your task
15:50
nmdis1999
okay, got it :)
15:50
Bertl
worry more about 'how' to get the data from that memory in an efficient way
15:50
supragya
Bertl, with a quick look can you verify is QTFF is something we should not go forward with? [https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFPreface/qtffPreface.html]
15:50
supragya
*verify if
15:50
Bertl
nmdis1999: for example, copying the entire frame to a different memory location is not very efficient
15:51
nmdis1999
okay, I understand.
15:52
Bertl
supragya: IIRC, QuickTime is not free (i.e. the license is quite restrictive)
15:53
nmdis1999
Bertl : Let me know when the system is ready, I am reading logs regularly. :D
15:53
supragya
that's what I thought, says it's an extention to MP4 so I asked
15:53
Bertl
btw, I did setup ZNC on our server, so if you want to test the IRC bouncer, just let me know
15:54
supragya
:) yaaay
15:54
supragya
sure Bertl !
15:56
nmdis1999
Going out for dinner. Have a great day everyone! :D
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nmdis1999
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16:01
supragya
TofuLynx: hi
16:01
TofuLynx
I'll be off for today!
16:01
TofuLynx
Later this night will be the "Serenata" on my University
16:01
TofuLynx
:)
16:01
supragya
Seems like your code is strange for OC is it?
16:01
TofuLynx
It's a special occasion
16:01
TofuLynx
yeah it is, I have to restructure it
16:01
TofuLynx
See you later!
16:02
supragya
serenata? more of ball?
16:03
TofuLynx
No :)
16:03
TofuLynx
Every year, the university has some sort of university student week
16:04
TofuLynx
where we celebrate
16:04
TofuLynx
it's a tradition
16:04
TofuLynx
https://www.noticiasdecoimbra.pt/wp-content/uploads/2016/04/s%C3%A9-velha.jpg
16:04
TofuLynx
And Serenata is the first celebration
16:05
supragya
seems grandeaur
16:05
supragya
*spelling
16:05
TofuLynx
where groups of students sing some sad musics related to "Saudade"
16:05
TofuLynx
which is a feel of missing something or someone
16:05
supragya
? sad
16:05
TofuLynx
yeah
16:06
TofuLynx
because for much people it's the last year of their course in the university
16:06
supragya
farewell?
16:06
TofuLynx
yeah basically
16:07
supragya
nice... have fun... or sad... whatever.. just enjoy :)
16:07
TofuLynx
ahahaha
16:07
TofuLynx
thanks
16:07
TofuLynx
https://www.youtube.com/watch?v=xgEMmoLMN48
16:07
TofuLynx
you can see a glimpse of it there
16:08
danieel
supragya: QTFF is not an extension of MP4. QT was first, then they standardized a subset of it within ISO
16:09
TofuLynx
See you guys later! :)
16:10
danieel
Bertl: what restrictions does the QT license force you?
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se6astian
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TofuLynx
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16:15
BAndiT1983|away
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16:16
Bertl
danieel: no idea, you tell me ... I usually do not spend much time on proprietary licenses
16:17
BAndiT1983
https://developer.apple.com/softwarelicensing/agreements/quicktime.php
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www2
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16:18
danieel
or here: https://developer.apple.com/softwarelicensing/agreements/pdf/qt_file_format.pdf
16:18
supragya
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16:20
Bertl
for example, point 2.2 seems pretty bad to me :)
16:20
BAndiT1983
how does adobe and other circumvent it?
16:20
Bertl
or 2.4 FWIW
16:21
danieel
if you make a mov io lib, then the product is the lib itself, hm?
16:22
BAndiT1983
yes, if we merge video stream and metadata in post
16:22
supragya
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16:22
BAndiT1983
then i would gladly send a floppy disk to apple
16:22
BAndiT1983
or just go to the genius bar and let them send it to the HQ ;)
16:22
BAndiT1983
sorry, forgot to take genius into "..."
16:23
danieel
also BM uses mov vs dng in their cameras, so definitely not something what cant be solved
16:24
Bertl
in general it is not worth bothering
16:24
Bertl
especially as they reserve the right to change the license whenever they feel fit
16:24
BAndiT1983
i would handle it like ARRI with ARRIRAW and get the data out in our format, with according clean lib
16:25
BAndiT1983
and conversion would be done later, a bit of inconvenience, but we are restricted by MCU at the moment
16:25
supragya
so you are happy if you are handed with lib? Only a lack of strong contendor would ask you to go that far
16:26
supragya
*means only if apple is that better
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www2
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16:26
BAndiT1983
supragya, what do you mean?
16:27
supragya
if a lib is proprietary, and API provided, does that allow inclusion in the project?
16:28
BAndiT1983
that's not for sure
16:28
danieel
mov/mp4 can handle off-file data, so make a BLOB and produce a MOV with the metadata only (or paste the metadata after the blob and you are saved from remuxing)
16:28
BAndiT1983
danieel, first we need any sort of interface to get data from memory to some permanent disk
16:29
danieel
and it pretty much handles all the issues with various time/frame/data mapping
16:29
BAndiT1983
afterwards we can check if we can produce file formats on the fly or just streams with embedded meta data
16:29
BAndiT1983
Bertl, what are the possible solutions, which are not that difficult for first tets?
16:30
supragya
danieel: [make a BLOB and produce a MOV with the metadata only] <- is that an intended use or a workaround?
16:30
danieel
it allows you to create a mov wrapper on proprietary (custom) blobs
16:31
BAndiT1983
don't like proprietary here
16:31
danieel
making your format clearly described wont help you to pull it in fcpx/premiere :)
16:32
BAndiT1983
frame server? conversion?
16:32
danieel
so its proprietary until its compliant to any existing standard
16:32
supragya
Both points nice!
16:32
BAndiT1983
there are many ways to let people work with our stuff, but if apple is restrictive, then we should avoid to generate the files in the camera
16:33
supragya
be back in a while
16:34
Bertl
BAndiT1983: solutions for what?
16:34
BAndiT1983
transfer of frame data to some sort of permanent storage, it doesn't matter at the moment if it's not a video clip
16:35
Bertl
USB, ethernet, SD card
16:35
danieel
BAndiT1983: be careful, a still frame can already be stored on SD card
16:36
BAndiT1983
RAW12?
16:36
danieel
fps is the question :)
16:36
BAndiT1983
even if it's rather low, just a constant output would be nice
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supragya
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RexOrCine
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RexOrCine|away
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slikdigit
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slikdigit
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slikdigit
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20:03
Bertl
off for a nap ... bbl
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Bertl
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BAndiT1983
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20:31
g3gg0
hi
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RexOrCine
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RexOrCine|away
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g3gg0
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BAndiT1983|away
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RexOrCine
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Bertl_zZ
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Bertl_oO
back ...
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BAndiT1983
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www2
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