Hi there, I would like to realize a project of mine and therefore need a little help.
I got my hands on an old vga projector and would like to create a “outdoor cinema station” for the summer.
The plan is to view the movie with the projector and to listen to the “movie-audio” via a multicast stream that will be received by an app on multiple smartphones.
Why so cumbersome?
Well we want to watch a movie in the garden, but don’t disturb our neighbors
I plan to use a Raspberry PI B+ together with the projector and a wifi-router.
The Raspberry would be connected to the router via lan cable.
All i need now is a way to stream all audio output of the Raspberry to a multicast address.
I did some digging, but couldn’t find exactly what i was looking for:
The first article looks promising, but it was more meant to capture audio from a usb-audio card and not the general system audio, plus i could not get it working on my raspberry:
Here i found another article about streaming audio to rtp, but could also not get it working (was not sure about the audio source , also the pulseaudio deamon was always failing to start with this configuration).
This page was focused on delivering the audio to a bluetooth usb dongle, but with a few hints and examples i found interesting:
What I learned so far, I most likely need pulseaudio. But in which configuration?
I’m unearthing this old thread to discuss this topic, outdoor raspberry pi based cinema.
This needs several parts:
OSMC / Kodi box
a way of getting the sound to all the people watching the film
The hard bits, from what I can see, are:
self-powered: what battery, what gets powered from a battery?
** a pico one? but then you have limited luminosity.
** a full-fledged one? but you clearly can’t power it from battery then, or it gets far more involved
** either you just plug in speakers, not good for the original poster, but possible. Could use bluetooth speakers, there are a lot of decent ones out there now.
** stream the sound over wifi, using pulseaudio, airplay or snapcast? sounds hard, but also sounds really cool
** use FM radio! the pi can output FM radio with a clever hack (and variations thereof)
The last option sounds like the cleverest to me. No complex software to install, a boombox, a phone with earphones, a basic music player, all of these can tune in to the radio station and just play the sound, in sync. A bit like the decentralized dance party.
So, no real answers from me, but more food for thought