Possible Solutions to Fix QuickTime Not Playing MP4 Error Solution 1: Get Required Codecs
Downloading MP4 files from unauthorized sites. Abruptly terminated applications during the running state. Corrupted MP4 header file due to malware attack. Error converting MP4 file to another file format. Missing of vital components of QuickTime player. Incomplete or inappropriate installation of player QuickTime. Because of incompatible video codec or audio codec. However, at times, QuickTime can't open MP4 due to the following reasons: which means QuickTime can play MP4 files corrects sometimes. Actually, according to the Apply website, QuickTime player does really support MPEG-4 which includes MP4 and M4V formats. Possibles Causes for QuickTime Not Playing Some MP4 Files Errorĭoes QuickTime support MP4? Yes. Follow this article to find out why MP4 playback fails in QuickTime and the possible solutions to fix the issue. In fact, QuickTime MP4 playback issue has been asked frequently, but there are still many people feel confused about it. The error message goes like, "The document 'xx.mp4' could not be opened, A required codec isn't available", "Unsupported format or damaged file", "The file has no audio or video streams". But the weird thing is that QuickTime will reject to open some MP4 files created from GoPro, iMovie, Final Cut Pro, and more. MP4 file format seems one of QuickTime player supported native video formats. What am I doing wrong? Where should I open the video to play it? itunes or imovie? When I open quicktime, open file, mp4, there is a picture of the video with no sound and its not playing. I downloaded some mp4 videos and quicktime but cannot get them to play. Any help on the reasons why Quicktime won't play the MP4 movies would be greatly appreciated. 
An invalid sample description was found in the movie. When I try and play the movies using Quicktime I get the following error message: The movie could not be opened. mp4 format that for some reason Quicktime player doesn't seem to like. I have a large collection of videos in.
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