Some apps like VLC and MplayerX allow for looping forward and back and back to forward again, but QuickTime Player only allows video looping in the regular forward playback direction. QuickTime Player will even loop a video that is fast forwarding or set to play at a faster or slower playback rate, so even if you set a movie to play at 32x it will still loop repeatedly at that fast forward rate. In the example video looped here, we’re taking a time lapse recording from an iPhone and playing it repeatedly in a loop. Start playing the video as usual, when the movie ends it will automatically start at the beginning again in a loop, playing endlessly and repeatedly until stopped, closed, or paused.Pull down the “View” menu and choose “Loop”.Open the video you want to play in a loop repeatedly within QuickTime Player on the Mac.Playing a video in a continuous loop is just a matter of selecting the loop option for that particular movie within QuickTime for Mac OS X, here’s all you need to do: Looping a Played Video Repeatedly in QuickTime

Play mp4 on mac