FLAC is a lossless audio coding format, already supported in regular Chrome HTML5 playback. This feature adds support for FLAC in ISO-BMFF to Chrome HTML5 Media Source Extensions (MSE).




Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.



Chrome has had regular src= playback of FLAC since M56 (ChromeOS had it prior to that). Chrome M57 included src= support for FLAC in MP4, using FFmpeg's implementation of the isoflac spec draft to demux. Firefox implemented support for both MSE and regular src= playback of FLAC in MP4 in version 51 (~January 2017).

Search tags

MSE, FLAC, MediaSource, MP4, ISOBMFF, ISO-BMFF, lossless, codec,

Last updated on 2021-05-05