Default option now generates video with flawless quality

This program now by default generates video that has flawless resolution and audio. On the other side, this option takes very long to finish - approximately twice the resulting video duration. The flawless option can be piped in, for example, vlc, but it generally isn't very good idea. The fast version does not (yet) support piping while running.

To offset the default slow option, program will warn user how long will the action approximately take and remind them of the --fast flag, which generates generally watchable video, very fast.

I've also improved some bits, such as logging.