1893885 - Reduced time precision in media currentTime

Status: NEW

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

Description

[Lumière Élevé]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Steps to reproduce:

1. Visit https://gh.ltgc.cc/octavia/test/fakeQy.htm (as an example).
2. Execute self.debugTimeSource = true; in the console to get the player emit timestamps.
3. Play any of the listed demos, and see the time value emitting in the console.

Actual results:

Value of the currentTime property gets increased in a 40 millisecond step with random jitters, instead of the 2-millisecond precision when privacy.reduceTimerPrecision is enabled. This weird stepping doesn't go away when privacy.reduceTimerPrecision is disabled.

Expected results:

Value of currentTime should've been increased smoothly, like on Chromium browsers.

Comment 1

[Lumière Élevé]

The bug was spotted on 126.0b6 (Dev Edition), and confirmed to exist from 115.10.0 (ESR), all the way to 127.0b1 (Nightly Build available at the time of the report).

Comment 2

[Ardelean Oana, Desktop Test Engineering [:oardelean]]

Managed to reproduce this issue on:

• Firefox Nightly 128.0a1;
• Firefox Beta 127.0b1;
• Firefox 126.0;

Tested and reproduced on:

• Windows 10;
• macOS 12;
• Ubuntu 22;

Setting to Product to ‘DevTools’ and the Component to ‘Console’ . Please change if there’s a better fit, thank you.
Setting as NEW so the developing team can have a look.

Comment 3

[Nicolas Chevobbe [:nchevobbe]]

Console is only used to diagnose the issue. Moving to more appropriate module so the right folks can have a look

Comment 4

[Jim Mathies [:jimm]]

Does this reproduce in Chrome?

Comment 5

[Lumière Élevé]

(In reply to Jim Mathies [:jimm] from comment #4)

Does this reproduce in Chrome?

No, at least not in the abysmal time interval Firefox currently has.