[PLUG-AV] Another experiment in updating our AV workflow

[Harry McNally]

Hilariously, I think this little mixer has all the requirements for the 
backpack event streaming kit:

https://www.aliexpress.com/item/1005001725996650.html

Two mic inputs with phantom power
Headphone monitoring of mix
Built in sound card (no idea of quality but how much is enough for talks?)
Powered by USB
Other features (play intro sound from USB drive?)
$26 risk that sound quality is poor (probably good enough)

All the best
Harry

On 17/5/21 2:16 pm, Harry McNally wrote:
> Hi James
>
> I wasn't able to stay on Sunday to hear what steps are needed next for the 
> RPi4.
>
> Now that the talks have an interim one-crate system, is your work on RTSP 
> services RPi-ready so the next meetup can try the architecture out ?
>
> I could research those USB-powered mixers to see if an "audio" RPi with an 
> attached mixer is feasible. That would replace the USB audio device I proposed.
>
> If there is a list of what packages are needed on top of the latest Raspbian 
> (lite or desktop ?) I'd prefer to bring a prepared RPi ready for integration 
> testing.
>
> I understand now that Nick's network design needs to be the 
> Swiss-Army-Router for all networking situations. That is a project in its 
> own right. Just wondering, Nick, if PLUG needs to buy a specific wireless 
> router so you have the flexibility for all the expected network situations; 
> and so network is a single box solution.
>
> It would be wonderful if RPis could mean a single crate (or several 
> backpacks) becomes the Aladdin's Cave for a multi-camera event :-)
>
> All the best
> Harry
>
> On 12/3/21 11:33 am, James Henstridge wrote:
>> On Tue, 9 Mar 2021 at 10:23, James Henstridge <james at jamesh.id.au> wrote:
>>> The eventual goal is to allow the different parts to self configure.
>>> If you turn the camera nodes on first, then the OBS machine should
>>> connect to them when it starts.  If the OBS machine starts first, it
>>> will wait until the cameras come online, and plug them into the scenes
>>> you've set up previously.  If everything works correctly, then the
>>> RTSP sender machines could easily be headless: the RTSP server would
>>> start on boot, and Avahi would advertise the camera once it gets a
>>> DHCP address.
>> I think I've got this part of the plugin working now.  The source is
>> now gets you to choose a service name for the stream (e.g. "Camera-A"
>> in the sample rtsp-sender.conf), providing an option list of all
>> available cameras on the local network.  When the camera drops from
>> the network, the underlying ffmpeg_source is reconfigured with an
>> empty URL, and when it appears again we configure it with the new URL.
>> This means that OBS reconnects to the camera almost instantly when it
>> becomes available.
>>
>> So that pretty much covers what I wanted from an auto-configuration
>> stand-point.  If you set up all the OBS scenes you want for a
>> broadcast in advance, it would pretty much be a case of plugging
>> everything in and having it self organise.  There is no need for a
>> display on the sender machines, so it could easily be a Raspberry Pi
>> like I demoed this week.  We could even store the Pi and capture card
>> wired together, so setup would only involve connecting power,
>> ethernet, and HDMI.
>>
>> James.
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