Error playing music from web interface

[martinmartossimon]

Describe the bug
In my installation (docker-compose), koel start running, I can login and scan my music library, but when I try to play a song, koel starts to jump from one song to the next and doesn't reproduce any sound.

To reproduce

1. Login
2. Change user and pass.
3. Try to scan my library from web, but I got an error message: Error
   Unknown error.
4. I try to scan my library from inside the container with: php artisan koel:sync. It finished without error. Then I ran inside the container:
   php artisan koel:search:import (because I read on wiki). This command finish OK. All my media is scanned
5. Try to play a song from the web and it fails, see attached screenshots.

Screenshots

Console errors:

If I could scan my library, I suposed is an indicator that's not a permision problem over mounted volume. But Im not sure.

If applicable, add screenshots to help explain your problem.

Environment

• Koel version [e.g. v4.1.0]
• OS: [e.g. macOS Mojave]
• Browser [e.g. Chrome 79]
• PHP version [e.g. v7.2.0]
• Node version [e.g. v10.15.3]

Additional context
configuration:
docker-compose.yml

version: '3'

services:
  koel:
    image: phanan/koel
    depends_on:
      - database
    ports:
      - 7887:80
    environment:
      - DB_CONNECTION=mysql
      - DB_HOST=database
      - DB_USERNAME=myuser
      - DB_PASSWORD=mypass
      - DB_DATABASE=koel
    volumes:
      #- ./music:/music
      - /path/to/my/music/:/music
      - ./covers:/var/www/html/public/img/covers
      - ./search_index:/var/www/html/storage/search-indexes

  database:
    image: mariadb:10.11
#    ports:
#      - 3306:3306
    volumes:
      - ./db:/var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=superpass
      - MYSQL_DATABASE=koel
      - MYSQL_USER=myuser
      - MYSQL_PASSWORD=mypass

[martinmartossimon]

Inside de container I can see files in /music

Maybe is a permission problem and user www-data can't read them

[phanan]

What does the log under storage/logs/laravel.log say?