Your ideal video player size

What is your ideal video player (in video player Module) size that you have on your sites? 

620*600 of the player ..but i want to change the size of thumbnails which comes in timeline ..wana make them look bigger but don't know how to .. plus i wana put play sign on thumb so it will look like video not a picture .

This will involve a code change.  The thumbnail is pulled from a few frames in.  At the time the thumbnail is created, the play button png would need to be added to the image.  You need to look at the GD library to see what function you would need to do this.

Well, I learned from testing on two different sites that you can control the height of video player but not the width size... 

The width size just maximizes to the column size, hmm...