Friday, 2017-06-30

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mithroIshan_Bansal: pong02:49
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mithroIshan_Bansal / paddatrapper: I'm available now as office hours says04:02
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mithroI was pondering maybe submitting a "FPGA Project Miniconf" to LCA201804:15
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mithro_florent_: Who is Pierre-Olivier Vauboin?05:41
mithro& lambdaconcept05:42
CarlFKmithro: (12:46:24 AM) FunkyBob: but I'd need to know a lot more about HDMI05:50
CarlFKmithro: where is your ccc talk?05:50
mithroCarlFK: is there more context to that?05:50
mithroCarlFK: where was that said?05:51
mithroCarlFK: tell him to join here if he wants to know more...05:55
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CarlFKmithro:  FunkyBob - do you two know each other?  osdc, lca, pycon.au06:06
mithroFunkyBob: I'm pretty sure we have meet06:07
FunkyBobvery likely06:09
FunkyBobI was talking to you (I think) about using the hardware encoders on odroid boards and the like :)06:10
FunkyBobanyway... was looking to do a product that requires decoding HDMI and then emitting it again06:14
mithroFunkyBob: You've seen my HDMI2USB stuff right?06:32
mithroFunkyBob: the stuff we use to record PyCons + LCA06:32
FunkyBobam surprised USB has the bandwidth, tbh :)06:37
CarlFKit doesn't :p06:38
FunkyBobI see06:38
CarlFKi guess it does for what you have seen on the videos.  which is not full res/fps every single pixel.  lossy jpeg06:39
FunkyBobmy rough calc shows fullHD would be 6.2MB / frame06:40
FunkyBob186.6 MB /s @ 30Hz06:40
CarlFKI am going to plead ignorance on the exact protocol.  I know we can lower the quality if we want to increase fps06:41
FunkyBobCarlFK: I think we first met at OSDC 2010, iirc06:43
CarlFKSounds about right.  Melbourne, for sure06:44
FunkyBobat the convent... you were having trouble that turned out to be multiple instanes of the same model record in memory at once06:45
FunkyBobso... wonder what it'd take to implement this in HW
tpbTitle: GFWX (at
FunkyBobmithro: well, if you'll be at PyConAU again, perhaps we can chat more there :)06:46
CarlFKalmost 2am, I better get to bed06:47
mithroFunkyBob: We do 720p30 with MJPEG06:48
FunkyBobmithro: using a soft core CPU to implement JPEG?  or hardware JPEG cell?06:51
mithroFunkyBob: the soft CPU is way too slow to do the JPEG encoding08:13
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FunkyBobwhich core do you use?08:30
mithroFunkyBob: But the soft CPU does do things like load the encoding tables09:12
mithroFunkyBob: Ishan_Bansal is currently rewriting it09:12
FunkyBoboh, a custom jobby?09:22
mithroFunkyBob: The current one is written in VHDL and I think a customized version of mkjpeg09:24
FunkyBobare you talking about the JPEG encoder, or the CPU core?09:31
FunkyBobhey, didn't you have the Parallella board at one point?09:33
mithroJPEG core09:33
mithroThe soft CPU is lm32 or or1k09:33
FunkyBobjust found a risc-v port to paralelle09:34
mithroI've never had a Parallela board, I have a pipistrello board and a Zybo09:34
mithroThe parallella has a hard arm core, why would you want a risc-v?09:34
tpbTitle: picorv32 @ LibreCores (at
FunkyBobyears ago, when I still ran windows, I played with the Xilinx ICE tools, i think it was09:38
FunkyBobstarted implementing a simple CRTC...09:38
FunkyBobwanted to build up from there09:38
FunkyBob know I've asked this before (in person) mithro ... what tools do you use for dev?09:39
mithroWell, ISE - but we use them all via Makefiles not the gui or anything09:44
FunkyBobit was the waveform gui test tool I found most useful09:51
mithroThat is my talk on how we do firmware development10:01
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paddatrappermithro: is the JTAG indicator LED the only LED connected to the FX2 on the opsis (PE5)?12:41
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paddatrappermithro: also I don't see any LEDs connected to the FX2 on the atlys12:51
CarlFKhas anyone flashed from prebuilt?   Im stuck here trying to find what dir to find the file in:
tpbTitle: HDMI2USB-firmware-prebuilt/archive/master/v0.0.3-715-gbc835e3/opsis at master · timvideos/HDMI2USB-firmware-prebuilt · GitHub (at
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