Thus, to make iMovie export MP4 file compatible with QuickTime player, you need to convert iMovie video to QuickTime best format like MOV H264 format.
See, the video codecs, video and audio formats of iMovie and QT player are not always coincide. m4p) MP3 Core Audio (.caf) AIFF AU SD2 WAV SND AMR
Container formats: QuickTime Movie (.mov) MPEG-4 (.mp4. Video codecs: MPEG-4 (Part 2) H.264 H.263 H.261 Apple ProRes Apple Pixlet Animation Cinepak Component Video DV DVC Pro Graphics Motion JPEG Photo JPEG Sorenson Video 2 Sorenson Video 3. Audio formats: AAC AIFF BWF CAF MP3 MP4 RF64 WAV. Container formats: MP4 MOV (QuickTime) 3GP AVI M4V. Video codecs: Apple Animation Codec Apple Intermediate Codec Apple ProRes AVCHD (including AVCCAM, AVCHD Lite, and NXCAM) DV (including DVCAM, DVCPRO, and DVCPRO50) H.264 HEVC HDV iFrame Motion JPEG (OpenDML only) MPEG-4 SP Photo JPEG XAVC-S. Check the supported video audio formats lists of iMovie and QuickTime and you'll get a whole picture. And the video audio codecs supported by iMovie and QuickTime are not 100% identical. Not all video and audio codecs in MP4 format are supported by QuickTime. MP4 is a container format - a box that contains your video, audio, and metadata. The video file exported from iMovie is usually formatted as MP4. 
Convert iMovie Export File to QuickTime Best Format Upgrade macOS to the latest version if needed. Therefore, check your iMovie export and Mac operating system. Cuz all Macs on High Sierra or higher OS will support HEVC playback with Mac's default QuickTime player.
If your iMovie export MP4 footage is formatted by HEVC (x265) codec, your QuickTime player can't smoothly play iMovie MP4 HEVC video unless your QuickTime player is running on macOS High Sierra or higher operating system. Delete the iMovie PreferencesĬheck your iMovie export file first. Top Solutions to iMovie Export Incompatible with QuickTime Issue
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