A test of a new intervention or treatment on people for. detecting. -Tolerability. -Safety. -Efficacy. A Clinical trial is defined as a prospective study. comparing the effect and value of intervention. (s) against a control in human beings.
Most DVD Players support playing DL DVD-R, DVDÂ±R/RW, DVD, CD-R/RW, MP3, JPEG, however different plays have their special features. You need to introduce us what DVD player you have and then we can show you the detailed video formats.
Don't know if it is the hardware problem or which dvd player software you are currently using, I'm also an Windows user and I just find that playing DVDs is just the basic function of 5KPlayer which, is a potential new media player that also works as a free dvd player software perfectly on my Windows 8.1 so far.