Modernizr: False negative on Video Autoplay (Modernizr V3)

[germanalvarez]

After checking how did video Autoplay work on v3, I just opened my website from Firefox and it had a no-videoautoplay class, this is a false negative as it does support it:

On Chrome, there's another false positive (no-videoautoplay).
On IE11, there's another false positive (no-videoautoplay).
On Opera, it detects it correctly (videoautoplay).

[peterkeating]

Ran into this issue also, only way round it I found was to increase the waitTime value, which obviously isn't ideal.

[patrickkettner]

Hey guys
Super sorry about how long it took to reply. This detect is...shaky. The issue is almost certainly load on the site using the detect. Could you share a url where you hit the issue? What was the waitTime that worked for you?

[peterkeating]

I've set the waitTime to 800 but I'm still seeing false negatives unfortunately. I'm using the autoplay detect on http://moov2.com/built/fable-legends to determine whether to swap an image for a video in the "Video" section if autoplay is supported.

[patrickkettner]

@peterkeating what sort of browsers were you getting the false negatives before you changed the value?

[peterkeating]

@patrickkettner Primarily this was happening in Chrome v39.

[patrickkettner]

Mobile or desktop? OS x, windows, androind, iOS? Which version of the OS?

On Mon, Dec 1, 2014, 4:05 AM Peter Keating [email protected] wrote:

@patrickkettner https://github.com/patrickkettner Primarily this was
happening in Chrome v39.

—
Reply to this email directly or view it on GitHub
https://github.com/Modernizr/Modernizr/issues/1427#issuecomment-65036509
.

[peterkeating]

Apologies, Windows desktop.

[patrickkettner]

which version of windows

On Mon, Dec 1, 2014 at 10:54 AM, Peter Keating [email protected]
wrote:

Apologies, Windows desktop.

—
Reply to this email directly or view it on GitHub
https://github.com/Modernizr/Modernizr/issues/1427#issuecomment-65084653
.

patrick

[peterkeating]

8.1 Pro.

[ondjazz]

Same problem here.
Windows 7 64 bit.
Autoplay true in Chrome 40.0.2214.38 beta-m
Autoplay false in IE 11.0.9600 and FF 34.0.5.
Both IE and FF suports autoplay.
Adding 10 seconds of wait time does not change the outcome.

[ryanseddon]

I believe I've found the fix wanna test this and see if you get the correct results?

[ryanseddon]

Closed via #1795

[yuchant]

Chrome 48.0.2564.116 unreliably detected. First load is OK, subsequent loads shows no-videoautoplay class.

[petrklus]

Same on Chrome 55 - first load usually OK, subsequent loads intermittent

[glomotion]

Chrome 84.0.4147.105 in Mac 10.15.6 is incorrectly reporting false:
https://codepen.io/glomotion/pen/gOrpoXG

could we plz re-open this issue?