It fetched thumb of specified size from first video or images of wordpress post. This is the git repo for my wordpress plugin amtyThumb. I created it 4-5 years ago and it has more than 3K downloads.
It helps you to extract images or first frame of a video from any wordpress post and resize them in thumbnail of any preferable size.
It cached the image which can be removed on user's wish.
It is just an API and can be used by other wordpress plugins.
I am pausing it's development due to other priorities. However I'll keep supporting for any bug, small features, and any request.
This plugin is stable and there is no bug reported in last 5 years. Still if you face any issue, report it here.
If you like this plugin, tell to your friends. This is the best way of advertising any open source project.