Eclipsa Audio Player: play IAMF files free in your browser

The Spatial9 Eclipsa Audio Player is a free web app that decodes IAMF (Immersive Audio Model and Formats) files directly in the browser. It plays standalone .iamf bitstreams and MP4 files with an IAMF track, renders them to stereo or binaural headphone sound, shows live channel meters and file details, and can run a loudness and peak check. Files never leave the device.

Key facts

  • Price: free, no account and no sign-up.
  • Privacy: decoding runs inside the browser; files are never uploaded.
  • Inputs: standalone .iamf bitstreams and MP4, M4A or MOV files with an IAMF track.
  • Codecs: Opus, AAC-LC, FLAC and LPCM.
  • Audio elements: channel-based layouts up to 9.1.6 and scene-based ambisonics up to third order (16 channels).
  • Playback: instant A/B between a stereo fold-down and a binaural headphone render, with live channel meters.
  • Details: IAMF profile, codec, audio elements and mix presentations.
  • Quality check: ITU-R BS.1770 integrated loudness, true peak, clipping and silent channels, with a downloadable report.
  • Samples: official Alliance for Open Media iamf-tools test files (7.1.4 Opus, 7.1.4 FLAC, animated third-order ambisonics).

What it does

  • Stereo or binaural, instantly. Flip between the stereo fold-down and the binaural headphone render while it plays. Press A or B, the music never stops.
  • See every channel move. Live meters for every speaker and ambisonic channel, so you can tell a true 7.1.4 or 3OA scene from a stereo file in disguise.
  • Know what is inside. Profile, codec, audio elements and mix presentations, read straight from the IAMF bitstream.
  • Check before you ship. Loudness, true peak, clipping and silent channels, with a report you can download and share with your team.

How to play an Eclipsa Audio file

  1. Drop a file or pick a sample. Any .iamf file, or an MP4 exported for YouTube with Eclipsa Audio.
  2. Put on headphones. Binaural rendering places sound around and above you, outside your head.
  3. Compare and check. A/B stereo against binaural, read the file details and run the quality check.

Frequently asked questions

What is Eclipsa Audio?

Eclipsa Audio is the name Google and Samsung use for IAMF, the open immersive audio format from the Alliance for Open Media. YouTube supports it for spatial audio on headphones, TVs and soundbars.

How do I play an .iamf file?

Drop it on the player on this page. It decodes in your browser, so there is nothing to install. You can also play MP4 files that carry an IAMF track, like the ones made for YouTube.

Is my file uploaded anywhere?

No. Decoding, playback and the quality check all run on your device. The file never leaves your computer.

Do I need headphones?

For the binaural version, yes. Binaural rendering uses how your ears hear direction to place sound around and above you, which only works when each ear gets its own signal. The stereo version works on any speakers.

Which codecs and layouts are supported?

Opus, AAC-LC, FLAC and LPCM, with channel layouts up to 9.1.6 and ambisonics up to third order. The official iamf-tools web demo does not decode AAC; this player does.

Is this a reference renderer?

No. It is an accurate preview for checking and sharing your work. Final delivery should still be confirmed on the target platform and devices.

How do I make my own Eclipsa Audio files?

Spatial9 turns stereo songs, stems and videos into Eclipsa Audio for YouTube, and converts Dolby Atmos ADM masters to Eclipsa Audio for free.

IAMF and Eclipsa Audio web player guide · Free ADM to Eclipsa Audio converter · Try your current files · Try Spatial9 free