2025242 - MKV video with MP3 audio track plays without sound in FireFox.

Status: RESOLVED DUPLICATE of bug 1991747

(Core :: Audio/Video: Playback, defect)

Description

[Pēteris Caune]

Attachment: 2026-03-17-22-53-28-9ffbae.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:148.0) Gecko/20100101 Firefox/148.0

Steps to reproduce:

On my website I tried to playback MKV video with MP3 audio track.

MKV video link: https://v01d.have.lv/vp/movies/test/fm/al.mkv

Actual results:

The problem is that MKV video plays MP3 audio track without any sound.
With AAC audio track plays with sound but another problem is that MKV video initially downloads whole video, including large sized that takes time, and only then plays it.

Expected results:

When starting to play MKV with MP3 audio track should be playing with sound and not muted.
In comparison with MP3 and AAC, the benefit of MP3 is much better quality and it starts playing without downloading whole video like native MP4 with AAC audio track.

Comment 1

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: Playback' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.