jasonsavard@ - Thanks for filing the issue...!!

Could you please provide a sample html file to test this issue.

This will help us in triaging the issue further.

Thanks...!!

Attached is a sample options.html for a Chrome extension.

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Thank you for providing more feedback. Adding requester "krajshree@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

jasonsavard@ - Thanks for the sample html file...!!

Tested the issue on Win-10 using chrome reported version #56.0.2924.87 and latest canary #59.0.3032.0.

Attached a screen cast for reference.

Following are the steps followed to reproduce the issue.
------------
1. Opened chrome browser.
2. Opened options.html file.
3. Observed that video loaded with a play button as expected.

jasonsavard@ -  Could you please check this issue on latest canary #59.0.3032.0 by creating a new profile without any apps and extensions and please let us know if the issue still persist or not.

Thanks...!!

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I am having the same issue with my chrome extension with version 56.0.2924.87 using the same method of embedding youtube videos.

When using canary version 59.0.3032.0 (64-bit) on win-10 the youtube player works perfectly.

Thanks,
Nick

I am facing the same issue too. The bug is Chrome Extension specific. Opening up the .html file in the browser should be fine nonetheless. Creating a manifest.json and options.html file and loading the unpacked extension might help reproduce the error.

@krajshree The issue as reported in the initial description occurs only within the context of a Chrome Extension just as @konstant has noted.

Attached is a sample manifest.json and index.html for a Chrome Extension. As mentioned above the issue occurs only when trying to embed inside a Chrome Extension.

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Created a sample extension with problem description:
https://github.com/terales/youtube-not-play-in-extension-in-crome-v56

Video won't load in Chrome v56.

Checked in Chrome Canary v59 and Chromium v59 with empty profiles — player works, but request for iframe source marked as "cancelled".

I had the same problem.
Updating Chrome to v57 worked.

Request won't be canceled there and the player works. 

Sadly, the video that I wanted to play there was blocked by WMG and I can be only played on http://www.youtube.com. (see attachmend. Sorry but it's on German)

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This area of the code has changed since Chrome 56.  Can you please test in Chrome beta (57) or dev (58), and report back whether it works or not?

Also, when you say "intermittent", do you mean it sometimes works, sometimes doesn't?

It would seem with the latest stable update to Chrome 57 that the issue seems resolved.

@szager@chromium.org
> Also, when you say "intermittent", do you mean it sometimes works, sometimes doesn't?

It always doesn't work in Chrome v56: with manually created iframe, with iframe created with API.

It won't work in options page, new tab and other pages loaded with `chrome-extension` protocol.

Vimeo player works fine in both v56 and v57 versions.

Glad to hear that it's working in 57.  This is probably not a fix that we would do a stable push for, so you'll have to wait until 57 becomes stable (which should be soon).