Reducing the size of the video preview was a great idea as subtitling often involves the audio part of a video however there are moments when visual elements needs to be subbed as well (e.g. foreign language signs). I think it would be a great idea to either have an option to increase the size of the video preview would allow a separate window to hold the video preview (and video controls), this would also allow users to take advantage of multiple monitors
This will need some coding, but I guess I can create a copy of the video player on another form and make it possible to switch from the video preview being a tab or another window.