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.
A VOB file allows a DVD to store and access all of the data necessary to play a movie on a DVD player. VOB files allow a DVD player to locate the video file, audio files, and streaming data required to play a movie and provide the user with the same control he/she would have in a movie that is played on a computer.