unable to set Alt text for thumbnails within a view

When building a view of Kaltura media nodes it seems impossible to have the thumbnails display alt text. In my case I've been attempting to use the node title as the alt text.

I've tried the following two methods but to no avail.... :(

1) I created a view with the fields: node:path, node:title, Kaltura:kaltura item thumbnail. Path and Title fields were excluded from display. Whilst the kaltura item thumbnail was set to "output this field as a link". I then entered [path] as the "link path" and [title] as the "alt text".
Then I added the following filters:
Node: Type = Kaltura Media Node
Node: Published = Yes
kaltura: kaltura entry media type = Image
kaltura: was the Kaltura node created when adding a comment on another node = No

Unfortunately, the kaltura item thumbnail settings were ignored when the view was rendered.

2) I changed the order of the fields to: path, kaltura item thumbnail, title. Path and kaltura item thumbnail were set to be excluded from display. I then set the title to display and checked the "rewrite the display of this field" and entered the following:

<a href="[path]"><img src="[kaltura_thumbnail_url]" alt="[title]"></a>

This was the closest i got to my thumbnails having alt text. Unfortunately the "[kaltura_thumbnail_url]" token didn't return anything in the rendered display...

I'm sure there must be something i'm missing. Alt text represents a lot of value in terms of SEO....

I've also cleared my caches after each attempt to ensure nothing's going wrong in that department.