After removing in hit with us to share their latest build with us, we invited Matvey Fridman of Germany-based prolongation association Spiegelbilder Studio to write a guest blog post about their CRT video walls combined for a rope STRANDKØNZERT.
CRT video wall
About a year ago, we had a thought of building a outrageous video wall out of aged TVs to use in a song video. It took some time, yet half a year after we found ourselves in a studio indeed building this thing regulating 30 connected computers, 24 of that were Raspberry Pis.
How we did it
After weeks and months of preproduction and testing, we motionless on dual uninterrupted days to build a wall, emanate a underlying IP network, run a few tests, and afterwards film a artists’ opening in front of it. We indeed had 32 Pis (a churned bag of first, second, and third era models) and even some-more TVs prepared to go, given we didn’t know what a final build would indeed demeanour like. We finished adult regulating 29 apart screens of several sizes bending adult to 24 apart Pis — a remaining 5 TVs got a daisy-chained video vigilance out of other monitors for a cold effect. Each Pi had to run a giveaway program called PiWall.
Since a TVs usually had analogue video inputs, we had to get special combination dermatitis cables and afterwards adjust a RCA connectors to possibly SCART, S-Video, or BNC.
As shortly as we had all of that running, we connected any Pi to a 48-port network switch that we’d bending adult to a Windows PC behaving as a DHCP server to automatically allot IP addresses and hoop a multicast addressing. To make remote control of a Raspberry Pis easier, a apart master Linux PC and dual MacBook laptops, any with SSH enabled and a Samba server running, assimilated a network as well.
The MacBook laptops were used to dump dual files containing a settings on any Pi. The .pitile record was singular to any Pi and contained their particular IDs. The .piwall record contained a same info for all Pis: a measurements and positions of any singular shade to assistance a program separate adult a video vigilance entrance in by a network. After any Pi got a authority to start a PiWall software, that specifies a UDP multicast residence and settings to be used to accept a video stream, a master Linux PC was tasked with streaming a video record to these UDP addresses. Now any TV was display a territory of a video, and we could start filming.
The whole routine and a essence of a files and commands are epitomised in a infographic below. A lot of hearing and blunder was concerned in a creation of this project, yet it all worked out good in a end. We wish we suffer a qualification behind a song video even yet a song is not for everybody 😉
Source: Raspberry Pi blog
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