Support videoobject for XHTML/FO

[tomschr]

Problem Description

For our doc evolution project we would like to support screencasts. Of course, this needs to be supported first in GeekoDoc (see below).

Input XML fragment with informalfigure/mediaobject/videoobject

```xml Hello ```

However, there are differences between the XHTML and XHTML5 output:

Output HTML from the XHTML stylesheet

```html

```

Output HTML from the XHTML5 stylesheet

```html

```

Problem: The <embed/> doesn't work as expected. It's just an empty page. However, the (X)HTML5 stylesheets create a HTML5 <video> tag which is good.

Keep in mind: these are just the original DocBook stylesheets.

Expected Behaviour

We need to adapt it to our stylesheets:

• [ ] correct our XHTML customizations
• [ ] make videos work also from SUSE Wistia video platform
• [ ] decide and implement what we want to do for FO/PDF.

References

• openSUSE/geekodoc#95

[tomschr]

Open question: how do we distinguish between content for Wistia and other content?

Wistia needs the following markup:

<script src="https://fast.wistia.com/embed/medias/abcdefghij.jsonp" 
async></script>
<script src="https://fast.wistia.com/assets/external/E-v1.js" 
async></script>
<span class="wistia_embed wistia_async_abcdefghij popover=true popoverAnimateThumbnail=true" 
style="display:inline-block;height:84px;position:relative;width:150px">&nbsp;</span>