Is there a thumbnail generator plugin for video assets? I need a thumbnail image of a video which i upload as an asset. Instead of uploading an image manually I'd prefer craft to generate a thumbnail for me.

Is there a plugin I didn't find or did someone find another workaround?
There is a plugin called 'Transcoder' But it's not free:
https://github.com/nystudio107/craft-transcoder/blob/v1/README.md