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.
In fact, whether the DVD players play AVI videos or not, it depends on the DVD player model, the AVI video codec or the AVI video resolution/size: 1  Most DVD players only accept MPEG-2 in standard VOBs. 2  Though some newer DVD players can play AVI files, it only plays AVI which is encoded with DivX. However, AVI is a container video format which may encoded with different video codecs like DivX, Xvid, MPEG-4, H.263, WMV, MPEG-1 and etc.
If you see an error from Windows Media Player that says compatible DVD decoder not installed, this means that a plugin (called an mpeg-2 decoder) needed to play DVDs is not installed. The Windows Media Player plugin is sold for a fee. However, the VLC Player program, available free of charge, will enable you to play DVDs or any type of video file. We recommend downloading this software from www.videolan.org in order to play DVDs on your computer.