Open Bug 1650718 Opened 4 years ago Updated 4 years ago

QuickTime .mov file's audio does not play in Firefox

Categories

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

Product:
Core
Component:
Audio/Video: Playback
Platform:
Unspecified
macOS
Type:
defect

Tracking

()

Tracking Flags:
Tracking Status
firefox-esr68 --- affected
firefox-esr78 --- affected
firefox77 --- affected
firefox78 --- affected
firefox79 --- affected
firefox80 --- affected

People

(Reporter: cpeterson, Unassigned)

References

(
URL
)

Details

Steps to reproduce

  1. Load and play https://ptgmedia.pearsoncmg.com/imprint_downloads/peachpit/peachpit/videosampleclips/krug/SteveKrug_UsabilityDemo.mov

Expected results

The video and audio will play, just like in Safari 13 on macOS 10.15.5.

Actual results

The video plays but no audio plays in Firefox. Firefox's "DevTools Media Panel" extension says this file has no audio, but Safari plays audio.

Loading the .mov URL in Chrome will download the .mov file instead of trying to play it.

Firefox wasn't even able to play this .mov file's video until 56.0a1 Nightly build 2017-06-20. Then the video would play, but not the audio.

Here is build 2017-06-20's changelog:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=95543bdc59bd038a3d5d084b85a4fec493c349ee&tochange=7a6baa6cca3292e8099e652b64d27e74df560874

Perhaps this file was previously rejected by the Stagefright MP4 parser and enabling the new Rust MP4 parser (bug 1370175) allowed Firefox to load it for the first time?

See Also: → https://bugzilla.mozilla.org/show_bug.cgi?id=1370175
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