Custom Thumbnail image? Html5

#1

Hi, is there a way to add a custom thumbnail for a video instead of frame 1, by adding code?

Or can you select a different frame than frame 1?

Thanks

Also, Will this be html5 compliant?

#2

Here’s the documentation on selecting a thumbnail:

I manually add a thumbnail (title screen, actually) in my html with this syntax:
<stream src="1234567890" controls poster="/images/title.jpg"></stream>