Video does not start playing automatically for amp-video/autoplay video on Safari.

[pallmk]

Description

Video does not start playing automatically for amp-video/autoplay video.

Reproduction Steps

1. Opt into a beta version of AMP
2. Open dev tools console
3. Load an AMP webpage
https://playground.amp.dev/?url=https%3A%2F%2Fpreview.amp.dev%2Fdocumentation%2Fexamples%2Fcomponents%2Famp-video&format=websites
4. Check 2nd video

Excepted Result:
Video should start to play automatically, when you open page.

Actual result:
Video does not play. After selecting play button sometimes screen goes dark.

https://screencast.googleplex.com/cast/NjQ3MTE5NjE1MDMzMzQ0MHw3Yzk0MWYwOC01MA

Note: After many refreshes it shows fallback message- Your browser doesn't support HTML5 video.
https://screencast.googleplex.com/cast/NTM0OTcyMTUzNjIwMDcwNHwyMjYyYWJiOS04ZA

Environment:

Device: Macbook Pro

Browser: Safari

Version 16.5.1 (18615.2.9.11.7)
Beta /Experimental version 2306301917000

Relevant Logs

No response

Browser(s) Affected

Safari

OS(s) Affected

No response

Device(s) Affected

No response

AMP Version Affected

2306301917000

[pallmk]

Desktop safari:
For amp-ima-video, ADV should display before playing of video content. For 3rd video it does play but after ads played screen goes dark. For 1st ad 2nd video after selecting play button screen goes dark.

Load an AMP webpage link: https://playground.amp.dev/?url=https%3A%2F%2Fpreview.amp.dev%2Fdocumentation%2Fexamples%2Fcomponents%2Famp-ima-video&format=websites

https://screencast.googleplex.com/cast/NTE4MDg1MjA4NTQ1Njg5NnxjYmE5MjI5NC1jNg

[erwinmombay]

hmm i believe this might just be normal behavior on safari, ill try and dig up some docs to make sure

[erwinmombay]

@pallmk while on the playground page, could you go to safari's preferences -> websites -> auto-play and check the settings of the page? it looks like the default for safari is "stop media with sound". so this behavior you reported seems intended

[pallmk]

I have tried changing with the above settings but see same results. Let me know if I need to try any other settings.
Thanks.
https://screencast.googleplex.com/cast/NDczNTk2OTcwMjk2OTM0NHw1YzAzMGEwOS05Zg