![]() ![]() Go to play the video in m4v format using the player you prefer see if any luck. m4v, if you make this change, your document may open in a different application. You’ll be asked whether you are sure to change the extension from. Duplicate the original video file in Finder, then rename it and change its extension from. Just give it a try see if any luck when you found a MP4 video can’t be opened in QuickTime Player on Mac. QuickTime Player video supportĬhange extension from. ![]() We recommend MP4 with h.264 or h.265 codec for great compatibility with various devices and even online browsers. ![]() In such case, you can either use a more powerful media player with the codec support or transcode the video to a compatible codec, such as H.264. If the QuickTime Player won’t play a MP4 video, most likely the video is compressed using an incompatible codec. It is like a box that contains your video, audio, and metadata. Why MP4 videos can’t be opened or played on Mac?
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