 This sometimes required a second performer to handle video playback, leaving little room for improvisation by the DJ.In addition to the DVJ turntable players (virtually all DJs have two players for their "native" media of vinyl, CD, or DVD; some have additional players to accommodate other media, or they mix multiple sources at once), "DVJing" requires the use of an audio-visual mixing console, which allows the DVJ to select sources for audio and video and to blend or mix them.Many mixers also give the DVJ the ability to perform simple transformations on the video.