1240369 - detect initial and/or long blank audio stream as no audio, effect for audio indicator and mute button

Status: RESOLVED DUPLICATE of bug 1235612

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

Description

[YF (Yang)]

+++ This bug was initially created as a clone of Bug #1190040 +++

Heard from bug 1231244 comment 34.

STR:
Open http://tinybuild.com/ and waiting the loaded.


The audio indicator shown, but there is no sound. Looks the some mp4 files have video without audio track, Firefox show the correctly when open it in Firefox, but the audio indicator looks not.

Comment 1

[Loic]

It's this MP4 file:
http://tinybuild.com/wp-content/uploads/2016/01/Punch-Club-Reel_optimized.mp4

They keep the audio stream but it's blank.

Comment 2

[YF (Yang)]

Good catch. So it has an audio stream, but no audio change, and currently Firefox can not to detect it. I hope that it is possible, if we can detect an blank audio stream. But perhaps this is unnecessary if sites should be allowed to do so intentionally or unintentionally.

Comment 3

[Loic]

Yes, I think the website did a bad choice, they should have uploaded a video stream without audio track, not just a blank audio track.
IMHO, Firefox behaves correctly here.

Comment 4

[YF (Yang)]

As an unconfirmed enhancement, if we have the development and user resources to implement it. It can be an optional feature (pref).

Comment 5

[Alastor Wu [:alwu]]

It's what I want to implement in the bug1235612.