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.
Media Center will play a DVD disk from the Media Center Application, or directly from the Disk if the DVD Drive is set to Auto Play with Media Center as default. The DVD will not play if you right click the .ifo or .vob file and choose Media Center like WMP 12 in Win 7 would. It will also play a DVD File, but only if that file is in the Movie Library. You cannot open the file with Media Center. The DVD file also will not play if it is selected through the Video Library.