Bug 293310 – Incorrect media time for Opus audio in an Ogg container.

• Status: NEW
• Component: Media

[Chris Adams]

We recently ran into a problem with some Opus files which play correctly in every browser other than Safari. These are Ogg containers with 48kHz Opus streams - here's ffprobe's output:

[ogg @ 0x154e05bd0] 658 bytes of comment header remain
Input #0, ogg, from 'DB100298.opus':
  Duration: 07:32:36.61, start: 0.000000, bitrate: 24 kb/s
  Stream #0:0: Audio: opus, 48000 Hz, mono, fltp

If I use that file as the source for an <audio> tag, in Safari the total time will display as 7:58:26 in Safari and 7:32:36 in Chrome, Edge, Firefox, and tools like FFmpeg or VLC.

If I copy the Opus stream from the original Ogg container to a WebM container, Safari will load it with the correct time:

ffmpeg -i DB100298.opus -codec copy DB100298.webm

If I convert the Opus stream to a Vorbis stream in an Ogg container, it also has the correct time:

ffmpeg -i DB100298.opus -f ogg DB100298-vorbis.opus


This was reported on multiple systems running the latest Sequoia and Safari 18.5 (20621.2.5.11.8)

[Chris Adams]

I reported this at https://feedbackassistant.apple.com/feedback/17678667 because it affects QuickTime Player as well as Safari, presumably being located in a system framework like Core Audio.

[Ahmad Saleem]

rdar://151875752

[Chris Adams]

I updated the version tag to reflect that the behaviour is unchanged in Safari 26.1.