Solution to QuickTime MP4 Playback Problems on macOS High Sierra

Problems while playing video files is common. But the situation turns annoying when you don’t know how to fix the issue and get back to playing the video. On one such occasion, you had upgraded to the latest macOS High Sierra version. After that, there have been issues with MP4 video. The MP4 file has playback problems on QuickTime.

Well, you don't have to worry as there is a solution to every problem. Listed here are a few solutions to playback problems with QuickTime MP4 file on macOS High Sierra. If you have corrupt or damaged videos shot on iPhone, you can know how to repair corrupt iPhone video here.

  1. Install QuickTime 7 Pro:

Try installing QuickTime 7 Pro. This is because QuickTime 7 and above can handle MP4 files better. And, QuickTime 7 Pro is the best one to deal with .mp4 files. So, get QuickTime 7 Pro or any higher version on your MacOS High Sierra and play MP4 files.

  1. Install QuickTime MP4 codec:

Install QuickTime MP4 codec pack. Sometimes when the required codec is not present in QuickTime, there are chances of the MP4 file not playing. So you need to download the required codecs to play the MP4 video on your macOS High Sierra.

  1. Play on A Different Media Player:

The next solution is to try to play the MP4 video on an alternate media player. You can try playing the video on VLC player or MPlayerX when you experience QuickTime MP4 playback problems on macOS High Sierra.

  1. Convert MP4 to QuickTime Supported Format: 

If none of the above methods have worked out then the next thing to do is to convert MP4 file to QuickTime supported format. QuickTime plays most of the MP4 videos with MPEG2, MPEG-4, H.264, and so on. However, you would still come across error messages or experience choppy playback issues while trying to play the MP4 file on QuickTime player; especially, if the MP4 file is having unsupported audio or video codec. So, in this case, the ultimate solution is to convert the unplayable MP4 file to QuickTime supported format.

Make sure you use reliable tools for converting MP4 file to QuickTime supported format. Otherwise, the file can get corrupted.

Above solutions should solve your QuickTime MP4 playback problems on macOS Sierra. Unfortunately, if you cannot fix the issue with the above solution or the converted MP4 video fails to play then you can try this last and effective solution.

Repair Your QuickTime MP4 Videos on MacOS High Sierra

In case, the MP4 video file is corrupted or damaged then none of the media players can play it successfully, including QuickTime. In such cases, you can make use of reliable video repair tools to fix corrupt QuickTime file and play it without any issue or playback error.

I suggest Remo Video Repair tool to repair your corrupt MP4 videos. Don’t be confused by the name MOV repair, the software can also support MP4 video repair. Not just, corrupt MP4 files, it even fixes not opening, inaccessible, damaged MP4 and MOV video files in a short while. So, repair your QuickTime MP4 video which is showing playback issues on macOS High Sierra with this recommended software using below procedure.

Steps to Repair QuickTime MP4 Video on MacOS High Sierra:

Step 1: Launch Remo Repair MOV, select your corrupt MP4 file along with a healthy MP4 video (for reference) and click on the Repair button.

Step 2: Preview and verify your repaired QuickTime MP4 file.

Step 3: Save the fixed MP4 video on a new location.

Additional Information: If any of your movie files are corrupted or inaccessible, and you are looking for a tool to repair it, then  follow the link to repair video file in just a few simple steps .

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John Harris

Senior Editor, Content Analyst and a fan of exceptional customer service. John develops and publishes instructional and informational content regarding partition management, Windows hot-fixes, data management and computer troubleshooting.

As a tenured data recovery specialist, John shares exceptional insights and blog posts about data loss and data recovery across any storage device. With 8+ years’ experience in writing for Data Recovery for both Mac OS and Windows OS computers, he is an avid learner who always wants to polish and simplify the data recovery process. John passes his free time playing Chess and reading Science Fiction novels.

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