Getting "Error loading player: No playable sources found" with Chromium

I'm trying to play the audio program available here on my Kubuntu 16.04 (but under LXDE).

Results:

• Mozilla Firefox: It works fine.

• Google Chromium: I get this error message:

  Error loading player: No playable sources found

My question is mostly about Chromium. Why am I getting that message and how can I fix it?

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