I had this problem on my Raspberry Pi 4 and fixed it by updating Chromium to the latest version. Raspbian 10 comes with version 78. After running the update I was at version 88. Audio worked fine through the browser after the update.
I ran the command:
sudo apt-get install chromium-browser --yes
I am running a raspi B+ running retropi for a retro game station in my mancave and I have a dinosaur TV that only has RCA. I ordered a cable from Adafruit and it works like a charm. Cheapest and best one out there: https://www.adafruit.com/product/2881
All you do is plug it into the audio jack on the raspi and then into your RCA and you're set!
It's a great ...
You need to look at the .c source code. The .h file is included into the .c source code to make the program.
Using the Pico PIO is an advanced topic. If you are intending to learn how to program I suggest you start by using the Pico GPIO block to generate your waveform. If you are not intending to learn how to program you need to hire a programmer ...
The balena-sound enables you to add multi-room audio streaming via Bluetooth, Airplay, Spotify Connect and others to any old speakers or Hi-Fi using just a Raspberry Pi.
Those two plugins are to decode mpg files. That may very well be the problem. I just installed mopidy today. Twice, and for some reason installing mopidy would leave flump3dec installed incorrectly in my case. I did:
sudo apt-get gstreamer1.0-fluendo-mp3
And that worked for me. But I did read on a github discussion, that flump3dec is old and mpg123audiodec ...