Post-thumb Revisited Question

Is there a way to turn off the automatic usage of this image:

https://i26.tinypic.com/2ivgobm.png

Everytime you write a post with a video from YouTube or where ever in Post-Thumb Revisited? Because I include images with all my posts, even if there’s videos and I’d like it if it showed the actual image I posted rather than that dumb media stream.

Thanks.