Current Server Time: 19:11 (Central Europe)

#apertus IRC Channel Logs

2013/07/12

Timezone: UTC


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jucar2
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01:49
Bertl
dmj_nova: how's going?
03:02
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03:54
Bertl
okay, I uploaded version 0.8 of the CMV12k adapter, this should have everything required so please start checking the schematic and pcb for errors
03:55
Bertl
I probably will add an optional power supply later, in case the zedboard is not able to power the adapter properly
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s3bastian
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10:16
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10:40
dmj_nova
kicad is what we're using for PCB design, yes?
10:44
s3bastian
Bertl, is using Eagle
10:45
s3bastian
but KiCad can read the schematic and board files from Eagle as far as I understand
10:45
s3bastian
or the conversation/exchange is rather easy
11:01
FergusL
hi fellow apertusians
11:01
dmj_nova
hi FergusL
11:01
FergusL
hi dmj_nova, I think we know each other from some other channels :)
11:01
dmj_nova
FergusL: I was just about to ask you the same thing
11:02
dmj_nova
But I can't remember which
11:02
FergusL
Novacut and blender related channels most likely
11:02
dmj_nova
FergusL: That would definitely be it
11:02
FergusL
yes !
11:05
dmj_nova
FergusL: I'm trying to remember, are you part of the blender team?
11:05
FergusL
oh, no ! not at all
11:06
dmj_nov
found a conversation about rsync in the logs but can't think what prompted it
11:07
FergusL
I'm simply part of a spontaneous and informal micro-team of blender user in the cinema-field with which I developped some py scripts, it's all work in progress
11:07
dmj_nova
Ah I see
11:07
dmj_nova
what sort of scripts?
11:08
FergusL
hm... I probably asked about ways to backup camera shots
11:08
dmj_nova
Ah, I see
11:08
dmj_nova
Yeah, the Axiom is pretty exciting as far as dmedia is concerned
11:09
FergusL
oh, basic stuff, a hack that kind of emulates the "dual monitor" of usual NLEs, a script that auto-refreshes clips from their files and the biggest one, currently unfinished is basically adding EDL export
11:10
dmj_nova
ah, do you know much about EDL format?
11:10
FergusL
sure ! yes !
11:10
dmj_nova
EDL export is on Novacut's list of things to add eventually
11:11
FergusL
hm, I know some of it yes, but not much when it comes to transitions, overlays
11:11
dmj_nova
Of course we currently don't do transitions at all
11:15
FergusL
well, that's not a bad thing
11:15
FergusL
I mean, not to have it
11:16
FergusL
have you had the chance to encounter troy_s around this server ?
11:17
dmj_nova
name sounds familiar
11:17
dmj_nova
(yes
11:20
dmj_nova
we had a nice long conversation actually
11:20
FergusL
he knows a lot about the pro cinema fieald
11:20
FergusL
be it in editing workflow or in color science
11:22
dmj_nova
indeed
11:22
FergusL
btw about EDL, is Novacut still Python ? if yes, then part of the code is already here
11:22
dmj_nova
yes, novacut is in python3
11:23
FergusL
I really think EDL is a key point, and more generally offline editing is
11:27
christiankrupa
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11:28
dmj_nova
FergusL: yes, and moreover, I would like to see more applications build upon dmedia
11:28
FergusL
hi here christiankrupa :)
11:28
christiankrupa
hey FergusL
11:29
FergusL
dmj_nova: is dmedia python too ?
11:29
dmj_nova
yep
11:31
FergusL
cool !
11:32
FergusL
does dmedia do/will do re-encoding ?
11:34
dmj_nova
FergusL: Not at the moment
11:35
dmj_nova
Though there is a jobs system which would allow us to to reencoding in the background and tune that behavior
11:37
dmj_nova
of course Novacut works perfectly with DSLR footage, so there hasn't been much need for re-encoding as yet
11:38
FergusL
it's smooth with 1080p footage from dslrs ?
11:39
dmj_nova
on my development machine, yep!
11:40
FergusL
is it particularly powerful or something ?
11:41
dmj_nova
dual core sandybridge?
11:41
FergusL
not particularly ! that's cool then
11:41
FergusL
I mean, that Novacut can do that
11:41
FergusL
ffmpeg in Blender struggles to do so
11:42
dmj_nova
you can make it not be smooth if you make firefox eat all of your ram, but that's not Novacut's fault
11:42
dmj_nova
FergusL: I suspect blender is doing some extra kind of compositing or something that we aren't
11:42
dmj_nova
all we have to do is playback 1080P video
11:43
dmj_nova
It's roughly the same feat as playing DSLR footage smoothly in chromium
11:44
FergusL
yes but then there still are cuts in the edit etc... it needs to switch between files
11:44
dmj_nova
FergusL: Oh, we have a little html cheat for that
11:45
dmj_nova
it works far better than it should
11:45
FergusL
yes I remember ! we talked about it
11:46
dmj_nova
Yeah, the switching clips is very much a problem that not all video editing software has solved
11:46
FergusL
absolutely
11:46
FergusL
and that's where the quality of the internal data model comes in, and with it caches and more ride along
11:49
dmj_nova
in our testing, the fluidity of the switchover between clips is very important for judging the pacing and feel of an edit
11:49
FergusL
yes, it boils down to frame synchronisation too
11:50
dmj_nova
if you don't have both, you're guessing at what you've actually edited
11:51
FergusL
yes !
11:52
dmj_nova
I once used novacut to discover that another program had inserted 13 black frames between various cuts in a 70 slice edit
11:52
dmj_nova
this was entirely the fault of sloppy use of time
11:53
FergusL
haha yes
11:53
FergusL
(sometimes it's also just the editor, by the time I used Premiere Pro, I remember sometimes messing and entire edit by slightly sliding shots)
11:53
FergusL
messing a whole edit*
11:54
dmj_nova
I do quite like how Blender uses frames rather than time
11:55
FergusL
yes, to me as a young user it's fine
11:55
FergusL
but some pros with a longer experience like to have timecode everywhere
11:56
FergusL
this is something else I did in Blender ! adding a tc display in the header
11:57
dmj_nova
well, there's a difference I think between giving the user timecode for reference, and using it as your data model
11:57
FergusL
ha !
11:57
FergusL
that ! yes
11:58
FergusL
are NLEs using tc in the data model ? I never wondered such thing but that's interesting
12:00
dmj_nova
I've seen NLEs use nanosecond timestamps in the data model
12:01
dmj_nova
nanoseconds are simultaneously too precise and not precise enough
12:03
FergusL
uh, nanoseconds !
12:05
dmj_nova
FergusL: It *sorta* makes sense if your data model is obviously basically a serialized gstreamer pipeline
12:06
dmj_nova
A bad idea, but one can understand the logic
12:06
FergusL
at the lowest level, gstreamer certainly has to be at nanosecond precision but...
12:34
dmj_nova
but you only convert to timestamps at the very final moment
12:35
dmj_nova
it's easy to go from samples and frames to perfect timestamps
12:35
dmj_nova
the other way is really, really hard
13:12
Bertl
good morning everyone!
13:13
Bertl
ad eagle vs kicad, I had a look at kicad (once again :) and it has significantly improved since last time I looked, but it is still missing a lot of features, nevertheless, I plan to properly convert everything from eagle to kicad
13:14
Bertl
the reason to stick with eagle for now was that I'm a lot faster (atm) with eagle and we wanted to get something usable asap
13:15
Bertl
and as FergusL found out the hard way, recent eagle versions use xml so there is no danger of not being able to read/convert the data
13:17
Bertl
the light version of eagle is available as freeware for linux, mac and windows, so it should be no problem for review either
13:25
Bertl
as I said, please review the design, I'm open for suggestions and I definitely appreciate any bug/potential-problem-reports
13:25
Bertl
http://vserver.13thfloor.at/Stuff/AXIOM/qad-center-v0.8.sch
13:25
Bertl
http://vserver.13thfloor.at/Stuff/AXIOM/qad-center-v0.8.brd
13:26
Bertl
I'm off for now, have to get rid of some bulk trash in the garden.
13:46
s3bastian
Bertl, let me know when you are back
13:46
s3bastian
I am now fully focused on PCB reviewing and would like to discuss what would make sense
13:46
s3bastian
for example comparing pinout of the cmv12000 datasheet to the schematic
13:53
Bertl
not back but I'll be around every now and then ... yes, pinouts should be verified for all components
13:53
Bertl
voltage levels for all involved pins
13:53
Bertl
proper connectivity on ground/power planes
13:53
s3bastian
ok will start with cmv12000 pinout
13:54
Bertl
also the physical layout, footprints and 3D space
14:34
s3bastian
1. why did you split the 1.8V supply pins on the cm12000 into two groups?
14:35
s3bastian
2. why does group 1 have 6 capacitors linking to ground and the second group 7 capacitors
14:37
s3bastian
I can't see valuable of any part (ohm values for resitors, etc.) do I need to change some view settings or is that intentional?
14:43
s3bastian
3. same split for 3.3V pins (E2 and G4) on separate 3.3V symbol - just cosmetics though
15:18
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15:24
Bertl
the 1.8V is split up for routing reasons, and because it might help with getting a stable supply, but basically to simplify routing
15:24
Bertl
ad 1) just because there are a different number of power pins in each group
15:24
Bertl
ah, that was ad 2)
15:25
Bertl
3) will have to wait, it shouldn't be separate nets
15:27
Bertl
if you mean the schematic, then that's fine, not all +3V3 have a visual connection, but they are the same net (use the all seeing eye from the sidepane and click on it :)
15:29
s3bastian
yes its just schematics for now ;)
15:29
s3bastian
sounds good
16:03
s3bastian
pin out of FMC and CMV12000 mostly checked
16:03
s3bastian
schematics page 1 http://picpaste.com/pics/schematic-review-page-1-V-01-sRbv1ced.1373641372.jpg
16:04
s3bastian
schematics page 3
16:04
s3bastian
http://picpaste.com/pics/schematic-review-page-3-V-01-BKpit8fc.1373641385.jpg
16:04
s3bastian
no errors found
16:05
s3bastian
just added a text note to the sch file about cmv12000 running 32 channel two sided readout mode
16:05
s3bastian
https://github.com/apertus-open-source-cinema/alpha-hardware/blob/master/SFE-PCB/qad%20center%20-%20eagle/qad-center-v0.8.sch
17:46
Bertl
so, back now ...
17:48
Bertl
ad values for parts: yes, they are still missing, but I'll add them via script
17:48
Bertl
the decoupling capacitors are all 100nF
17:49
Bertl
the resistors I have to calculate, but that doesn't matter for the layout
18:02
FergusL
(hint for ops : this channel has no topic)
18:03
s3bastian
ok great
18:04
s3bastian
ad topic, I think thats OK we all know where we are and why we are here ;)
18:15
Bertl
well, it won't hurt to have a topic though
18:16
Bertl
for example: "Axiom Alpha Now!"
18:20
s3bastian
why not :)
18:25
s3bastian
apparently I am not the channel owner ;)
18:27
s3bastian
changed nick to: Se6astian
18:28
ChanServ
has set the topic
18:28
Se6astian
hurray
18:28
Bertl
severe case of split personality :)
18:29
Se6astian
all these letters and numbers make my head swirl :)
18:30
Bertl
now get us a real topic!
18:30
ChanServ
has set the topic
18:31
Bertl
arrrr! but you're missing one :)
18:31
ChanServ
has set the topic
18:32
Bertl
much better! :)
18:32
Se6astian
so official!
19:24
Bertl
okay, uploaded version 0.8.1 which has most of the non 100n values, the reduced pmod connector (and therefore a larger power supply area), and all the fixes/enhancements incorporated which were suggested so far :)
19:27
Se6astian
perfect, can you commit it to GIT?
20:03
Bertl
nice one! :)
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s3bastian
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s3bastian
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20:54
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21:03
Bertl
I've uploaded scands of the FMC connectors if somebody is interested ... they can befound here: http://vserver.13thfloor.at/Stuff/AXIOM/fmc_scan_600dpi.png http://vserver.13thfloor.at/Stuff/AXIOM/fmc_scan_1200dpi.png
21:14
FergusL
is there a size reference ?
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22:58
Se6astian
good night!
22:58
Se6astian
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