 My name is Peter and I'm from the C3 Rock. We are a German group doing video recording for a lot of events in Germany A lot of small events similar to this one, but also some really really really big events And and our biggest event is between Christmas and New Year's Eve in Germany And it's like 20,000 people around of 15,000 like an enormous hacker congress and because it's so enormous We also have like enormous lecture halls. We only have five so that's like not like for stamp with over 20 I think but it's like huge hearts with 3,000 people in there and we we have like scaling problems And one of the problems that's obviously is like how do you manage for example questions like in a room with 3,000 people? No one can run around and bring microphones So for we for example have like 15 microphones all over the room, but it doesn't stop there We have like panels with six speakers if each everyone has a microphone And we have like five microphones on the speakers and some more on the stage and in these and we have like live translations And in the end we have like 60 different sources of audio in one room And it's like really complicated to process that And what we tried this year for the first time is doing that not in a traditional way with an with a mixer console We also did that for the room But we tried to do it on a network basis because we're in the end most of us are software engineers So why not bring that problem to the software side? So what we did use is something that's called a is 67 Some of you might not done to that's like a priority standards for audio networks and a is 67 is basically Standards way of doing a similar thing So what you can do is like you have a stage mixer like mixing console or something might only be like a chassis mount like 19 inch device And you configure all your input sources It has like 60 or more input channels for microphones and line ins and things And you configure how they're named and how they're translated to network addresses That's what you can see here. It's been example configuration And what it does is it takes all this audio and pushes it into the network as a multicast stream So you have now all the audio channels from all rooms in one network and wherever you connect to that network You can get every audio channel out there Um, so what can you use that for? Well, you can use you can use it for a lot of things But because it was the first time we used it. We only did small Small tries. So can you come in the next slide, please? One thing. Oh, uh, other direction. Yeah, um, I try to develop, uh, software against this format using open source and when it comes to um, working with uh, media on open source There are some frameworks and G streamer is certainly one of the more powerful So these are examples on how one can interact with such an audio network receive channels and probably also send channels And we use that for some interesting projects. Like can you come in the next slide, please? That's one of the projects we did. It's a multi channel recorder like if you have these Five times 60 audio channels and you have the others information It's important to have backups of all of them because things go wrong in life events We saw that this morning and it would be really great to just say, okay I don't want that channel that was so loud on the microphone Just take that out and remix all the audio because I have every channel recorded separately. That's what we did here We had the computer just a normal Linux computer pulling the audio out of the network and recording every channel individually And we can do that with open source software and interface with professional mixing consoles this way Um, we also did like other things can show me the next slide. Thank you. That's another thing that we did It's like in loudness meter. We are metering all the output channels with the main audio from the stage And then two translations like to german english to german and english to spanish for example And we try to match all the loudnesses of all the channels So then we when you change from room to another on the live stream Or you have to turn your your volume up and that's another thing that we pulled out of this audio network You can just connect your computer there and pull out all the channels out And that's what we did with ax67 and if anyone has any questions or would like to play with that I'll be here today and also tomorrow to answer questions and please come to me And we can talk about that. Thank you very much