sudo add-apt-repository ppa:kubuntu-ppa/backports
sudo apt-get update
sudo apt-get install mplayerthumbs
Now enable thumbnails in Dolphin:
Enable “Video files(Mplayerthumbs)
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.