VSCode >= 1.13 greys out audio controls in previewHTML?

[ghost]

• VSCode Version: >= 1.13
• OS Version: OSX, Ubuntu

Steps to Reproduce:

1. Use any extension that will allow you to preview HTML (e.g. Jupyter or HTML Preview)
2. Render:
   <audio controls autoplay src="http://media.w3.org/2010/07/bunny/04-Death_Becomes_Fur.oga"></audio>
3. Observe that the controls are greyed out and the audio does not play

This is broken from 1.13 on, before that previewing audio just worked.

Reproduces without extensions: unknown

[DickvdBrink]

I get the above when opening a markdown as html; probably due to this.
The markdown code has a few options to disable the security options; maybe something like that has to be implemented in the extension to?

So I guess it is more a security feature that it doesn't work.

[ghost]

I don't think it's CSP related, the following renders the image ok:

<audio controls autoplay src="http://media.w3.org/2010/07/bunny/04-Death_Becomes_Fur.oga"></audio>
<img src='http://www.w3.org/html/logo/downloads/HTML5_Logo_128.png'/>

[ghost]

Oh, from the same version on, it seems that video is also not working (still using the HTML preview to check the rendering)?

<audio controls autoplay src="http://media.w3.org/2010/07/bunny/04-Death_Becomes_Fur.oga"></audio>
<video controls autoplay>
    <source src="http://media.w3.org/2010/05/sintel/trailer.mp4"
         type='video/mp4; codecs="avc1, mp4a"'>
    <source src="http://media.w3.org/2010/05/sintel/trailer.ogv"
         type='video/ogg; codecs="theora, vorbis"'>
</video>
<img src='http://www.w3.org/html/logo/downloads/HTML5_Logo_128.png'/>

[mjbvz]

Yes, the markdown preview would block http video by default but the previewHtml content should not have any Content Security policy set. Looking at the network requests for the webview, I do see the video file being requested successfully but there seems to be some error with the playback inside the webview. I'll investigate further

[mjbvz]

This appears to be fixed in VS Code 1.20 insiders builds:

Let me know if you are still seeing this in html previews

[mjbvz]

Actually, I just learned that we strip out ffmpeg and other media support from our release builds. This is by-design and something we will not change, but it does mean that many types of media playback will never be supported in webviews inside vscode