Sorry I'm doing such a lousy job of explaining!
I wish I could post a link it - but I'm working locally right now - so it's not on the web.
The issue is that unlike the thumbnails for the images - I don't seem to have control over the size of the thumbs for the videos. - even when I set the options in the admin panel.
I use 'customAlbumThumbImage' for the thumbs for the albums of images -In an ideal world, I'd be able to do the same for the video thumbnails.
I've tried uploading the thumbs at the exact size I want them to appear (300px) and setting the options for the thumbs at this size (both selecting 'crop' and 'don't crop'
The result is that they'll be 300 px, but they look really bad, as though I'd upsized a smaller image to 300px. (and yes, I set the image and thumb quality to 100%)
I hope this makes a bit more sense.
thanks
a