no sound on mp4 imovie project

How to Fix MP4 in iMovie no Sound or Missing Audio in Mac/iOS iPhone/iPad

In the early post, TechiSky introduces the Best Video Format for iMovie, which is MP4, MOV, MPEG-2, AVCHD, DV, HDV, MPEG-4, H.264. Though, MP4 is a supported video format for iMovie, many users find that MP4 video has no sound or audio after imported in iMovie (iMovie 10, iMovie 10.1.9, iMovie for iOS iPhone/iPad included)..