Hi all, I am trying to stream audio from a radio scanner connected to my pi via usb. In simple terms it is acting as a usb microphone. So far i have had no luck at all getting it to work! can anyone provide me with a working example flow/guide? The other issue I am having is my iPad Pro does not pl…

Hello, Does your scanner show up under Linux like a standard microphone/audio interface under alsa? If you do a arecord -l on the command line does show up as an input device or does it stream the data in some kind of raw format over serial? Johannes

If shows up with alsa you can install sox and my node-red-sox-utils nodes from github which are in beta right now to interface with it directly from nodered: [image] johanneskropf/node-red-contrib-sox-utils a simple node-red wrapper around the record functionality of the sox commandline …

Thankyou, this works! however the audio is really choppy! have you got any ideas to fix this? my flow is attached [{"id":"1a1e0044.8a069","type":"ui_audio","z":"a96ef2d9.1d179","name":"","group":"a29ae445.1c44c8","voice":"","always":true,"x":820,"y":60,"wires":[]},{"id":"93930129.3b614","type":"so…

Please put your flow inbetween ``` or use the </> button from the toolbar so that your Flow will be formatted properly and can be imported. Are you trying to livestream the audio? How are you consuming the stream?

Yes the audio is streaming to my dashboard

[image] blackwellj: Yes the audio is streaming to my dashboard I have no experience with this. The raw stream output is not really ment for listening, it’s normally fed to other software/nodes for recording or processing. Is the dashboard node you are using ment for playing streams? Because …

I'm using a node to add the wav headers. Is there a way of buffering the audio so its not choppy?

[image] blackwellj: I'm using a node to add the wav headers. Is there a way of buffering the audio so its not choppy? As I said I think the problem is that you are streaming audio chunks and the dashboard node is playing each and every chunk individually and not treating it as a stream. So th…

Node-RED

Node-RED Forum

USB audio on a Raspberry PI

Dashboard

blackwellj 18 November 2020 19:29 12

@dceejay did any updates get pushed to fix this?

Topic		Replies	Views
Play Sound from USB Microphone Dashboard	62	7279	8 August 2020
Node allowing for live chat(talk) and live sound General	21	6445	2 June 2021
Audio Streaming Feature Requests	0	546	31 August 2018
Voice record via dashboard Dashboard	6	580	3 April 2022
Extract audio data from usb sound card (rpi) General	5	657	19 September 2020

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

USB audio on a Raspberry PI

Related topics