Video Uploading example: NotAllowedError

[kudlav]

In Firefox 144:

1. Visit https://webgpu.github.io/webgpu-samples/?sample=videoUploading
2. there is exception, even refreshing does not help
3. But the example works
4. choose any other example from the left menu
5. choose again videoUploading from the left menu
6. example works (until you refresh the page)

unhandled promise rejection, please report a bug!
  https://github.com/webgpu/webgpu-samples/issues/new
NotAllowedError: The play method is not allowed by the user agent or the platform in the current context, possibly because the user denied permission.

In Edge 141:

1. Open this link in a new tab that is not currently visible tab: https://webgpu.github.io/webgpu-samples/sample/videoUploading/
2. Visit the tab
3. unhandled promise rejection

unhandled promise rejection, please report a bug!
  https://github.com/webgpu/webgpu-samples/issues/new
AbortError: The play() request was interrupted because video-only background media was paused to save power.

Windows 11 24H2

[kainino0x]

Thanks for the report, sounds like we need to add some handling for these cases! cc @beaufortfrancois

[beaufortfrancois]

I cannot reproduce in Edge 141 on Windows 11 Version 23H2 (Build 22631.6060):

[beaufortfrancois]

Re Firefox issue, @jimblandy does this ring a bell? My understanding is that play() should resolve when video is muted.

[kudlav]

Tested on another Win11 computer, unable to reproduce the Edge. Firefox is still reproducible:

[beaufortfrancois]

Autoplay is only allowed when approved by the user, the site is activated by the user, or media is muted is interesting.

Can you try removing video.autoplay = true; to see if it helps?

[beaufortfrancois]

Note that I can't reproduce in Firefox 146 on macOS.

[kainino0x]

Firefox has an option to disable all autoplay, maybe that's enabled? https://support.mozilla.org/en-US/kb/block-autoplay

Chrome only supports disabling sound (chrome://settings/content > additional content settings > sound) but that shouldn't apply here. IDK if Edge has any settings Chrome doesn't have.

[kainino0x]

BTW Chrome on Android is (or at least used to be) stricter about autoplay, IIRC it requires a user activation even to play muted video. When we run automated tests we pass a flag to disable that, I think it's --autoplay-policy=no-user-gesture-required. But I tried Chrome on Mac with --autoplay-policy=user-gesture-required and it doesn't break the sample, it just makes it wait for a user gesture to start playing.

[emilieroberts]

I was unable to reproduce on Firefox 144 with Windows 11 Pro 25H2.

On initial load the sample works and autoplays. Refreshing works. All samples seem to work.