Hi  Jeremy / Rich,
 

> (How) Could the video-id be read from a field stored at the current 
> tiddler?
>

Although I'm still keen to know how to do it using a tiddler field, *Astrid 
Elocson* was so kind as to provide an example on how to do it using an 
interesting type of "macro-variable":

https://groups.google.com/d/msg/tiddlywiki/5FugIFRgYLs/d6QEmHPjfF4J

in each video tiddler:

\define yt-id() EU-H0xhga08

that global macro (to render a link)

\define yt(time, minSec)
[[$time$|http://www.youtube.com/watch?v=$( 
<http://www.youtube.com/watch?v=$(youtubeid)$&t=$minSec$>yt-id)$&t=$minSec$ 
<http://www.youtube.com/watch?v=$(youtubeid)$&t=$minSec$>]]
\end

Best wishes, Tobias.

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