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#apertus IRC Channel Logs

2018/05/10

Timezone: UTC


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se6astian|away
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se6astian
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09:09
Bertl_zZ
changed nick to: Bertl
09:09
Bertl
morning folks!
09:30
BAndiT1983|away
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supragya
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09:35
supragya
hi Bertl!, available?
09:35
supragya
hi BAndiT1983 ;)
09:35
BAndiT1983
hi supragya
09:36
supragya
you here at this time (morning) on a week day?
09:37
BAndiT1983
it's holiday today, so i'm at home and tomorrow in home office
09:37
BAndiT1983
will work on apertus tasks, to get more progress
09:38
supragya
working on emulation myself!
09:38
Bertl
supragya: what's up?
09:39
supragya
do you plan on sending meta using Gbe for video streams Bertl ?
09:39
Bertl
would definitely be an option
09:39
supragya
and how will interframe markers look like on high speed channel?
09:39
Bertl
depends on the format
09:40
supragya
suppose it is just RAW12 that comes out
09:41
Bertl
well, 'just' raw12 won't work, as all codes would be used by the image data
09:42
Bertl
but in case we decide to go with 'just' 12bit words, then we have to reserve one or two for marking
09:43
supragya
any Idea how would we do it? offset calculations would work?
09:43
supragya
what if some bits get lost (is that even a possibility) ?
09:43
Bertl
no idea, all this depends on the actual channel
09:44
BAndiT1983
and dont't forget about possible header
09:44
Bertl
for example if we use a 'simple' USB3 stream (like it is planned for the USB3 module)
09:44
BAndiT1983
we need some secondary control channel, so the recording app gets a signal that new data will start to arrive
09:45
Bertl
we will certainly use some packet structure to contain the actual image data
09:45
supragya
would it be hard to induce a header such as (marker bits| sequenceID bits) before frame data
09:45
supragya
and the same sequenceID to be used when pushing meta on Gbe?
09:45
supragya
so that we can correlate which meta is for which frame?
09:46
supragya
in short: seqID|Frame and seqID|meta on different channels
09:46
Bertl
something like this has to happen, probably time codes are a better 'id' though
09:47
supragya
in a packet structure, would you go for meta/RAW12 piggyback (or meta in same packet as frame) so that we don't need a Gbe?
09:49
supragya
Also, for the recorder end, should I expect camera to provide me with structured meta? or should I expect it to provide me with a simple register dump for sensor/lens controller
09:57
supragya
*will check logs later
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supragya
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09:59
BAndiT1983
some meta data cannot be dumped, as lens controller is not there yet and also other stuff is residing in other areas, which probably cannot be just dumped
10:05
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10:09
Bertl
In general I think there are a number of options and it would be way better to 'design' data/metadata coherence independant of file formats and data streams
10:09
Bertl
*independent
10:10
Bertl
IMHO some kind of camera identifier (users choice) and a time code would be appropriate
10:10
Bertl
but that is just my idea ...
10:12
Bertl
regarding the USB3 interface, it would make sense to send metadata over the USB3 link instead of a GbE side channel, but in the beginning we won't be able to do that easily
10:12
Bertl
so I'm optimistic that this will happen sooner or later but probably not at first
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10:30
BAndiT1983
Bertl, that also my idea, to send the separate, later to concatenate by using some frame id
10:34
Bertl
off for now ... bbl
10:34
Bertl
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seaman
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13:21
RexOrCine|away
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13:51
danieel
if you seek for framing, then look up UVC (for USB) or GigEVision (for GbE), why I am again seeing reinventing the wheel?
14:21
BAndiT1983
danieel, and what are the licensing options?
14:21
BAndiT1983
one can pay a lot of money for that stuff or have to invent something himself
14:22
BAndiT1983
"GigE Vision is not an open protocol, and as such a special license is required to develop GigE camera drivers."
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15:15
Bertl_oO
thanks to proprietary solutions and licensed standards the wheel has to be reinvented over and over again ...
15:31
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15:37
Kjetil
https://xkcd.com/927/
15:44
BAndiT1983
Kjetil, and if 14 other standards are proprietary, what should be done then?
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BAndiT1983
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16:12
Kjetil
make a 15th and make it proprietary
16:13
Bertl_oO
sounds like a plan ...
16:24
RexOrCine
Objection.
17:21
TofuLynx
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17:23
TofuLynx
Good Afternoon Everyone!
17:54
felix_
just use some weird legacy protocol that includes checksums in the stream and then encapsulate that into rtp packets? ;P
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20:12
Kjetil
RTP? Surely you mean HTTP
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RexOrCine
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