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.

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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.

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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.

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2. 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.

3. 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.

4. 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 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.

RepairYour 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 MOV 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 movie file in just a few simple steps .

Contents

2. QuickTime Player

QuickTime is readily available for all Apple Mac computers and now comes installed as standard on newer models. However, if you have an older Mac, or if you have previously uninstalled QuickTime from your Mac and now want to install it onto your Mac again please continue reading. Alternatively, if you have QuickTime already and are just looking for a few tips and tricks, or if you just want to find out what version of QuickTime your Mac is running, this article should be of use to you.

QuickTime can be downloaded from Apple directly, or via some of the other trusted free download websites available on the internet. We've set these out for you in a little bit more detail below:

QuickTime: Apple official download

Mac OS X includes QuickTime Player (Version 10.x) which will handle most of your media playback needs. You will only need to install QuickTime if you have an older version of the Mac operating system which does not come with QuickTime already installed, you want to work with older media types, or if you have legacy workflows that are not supported by the newer QuickTime application. You can download QuickTime for Mac here.

QuickTime: Download it from other websites (free)

SOFTONIC: This website also provides ratings for QuickTime, the number of downloads this month and full details of the file size and its pros and cons. (Download)
TUCOWS: This is a great free website where you can download QuickTime quickly and easily for your Mac. This website provides full details of the files that QuickTime can play, together with reviews and details of where you can find product support. (Download)

Steps of QuickTime installation

Step 1. To install QuickTime on a Mac you should download the newest version of QuickTime Download (which at the time of writing is QuickTime Player 7 Version 7.6.6).

Step 2. Once the file has downloaded all you need to do is double click on the file which will be called, QuickTimePlayer7.6.6_SnowLeopard' and QuickTime will be automatically installed in your utilities folder.

How to test QuickTime on Mac

After you have installed QuickTime it is essential to test it to make sure that it has been installed correctly. You should test that QuickTime allows you to playback any steaming video or HD movie contents immediately embedded on a web browser, i.e. Safari. If QuickTime has been installed correctly you will get a message saying, QuickTime has been successfully installed.

Troubleshooting

Sometimes movie files cannot be played by QuickTime without additional software (even though QuickTime can open them). These files typically contain data that was created using a codec, i.e. a compressor that QuickTime player does not support by default. You might be able to obtain software from other developers that allows QuickTime to play these files. However, you should be careful to make sure that these files do not contain any virus or malware that might affect your Mac before you attempt to download them to your computer.

Steps of checking the version of QuickTime on Mac

Step 1. From the Apple menu, choose System Preferences.

Step 2. From the View menu please then choose the option for QuickTime (which should bring up the QuickTime pane).

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Step 3. If you click Register you will be able to see the registration information and the edition of QuickTime installed on your Mac will be shown underneath the box for your Registration Code.

Step 4. If you want to go one step further and find out what version of QuickTime update is installed on your Mac you will need to go into the About QuickTime tab. The version of QuickTime your Mac is running will be displayed at the top of the pop up menu.

How to update to the latest version of QuickTime on Mac

From time to time Apple releases newer versions of QuickTime. These can be downloaded (assuming you are connected to the internet). If you are connected to the internet and QuickTime is open, typically you will be notified that a newer version of QuickTime is available by your Mac and you will then be prompted to start the download. However, if you want to check for an update manually, choose: QuickTime Player > Update Existing Software. Your Mac will then check to see if there are any updates pending for QuickTime. If so, all you have to do is follow the on-screen prompts and the newest version will be installed.

If you require help during any stage of this process (and you have QuickTime open) you can see instructions for performing tasks by choosing: Help > QuickTime Player Help. From there you will be able to type in 'update' and QuickTime Help will bring up a full list of instructions in order to guide you through the process.

Troubleshooting

If you are having problems installing updates for QuickTime (and reinstalling or repairing it does not work) we would recommend not only to remove QuickTime from your Mac but also any related components, reboot your Mac, remove any target installation folders and then attempt to reinstall QuickTime from the beginning.

A list of the recent updates for QuickTime for the Mac can be found on the Apple website (here). Please note that QuickTime is constantly updated and there might have been further updates since this article was first written.

Steps of checking the version of QuickTime on Mac

If you want to uninstall QuickTime on a Mac you need to find and click the Finder icon in the Dock at the bottom of the screen. You will then need to find the Applications icon which is located in the left hand column of the Finder icon window. Locate the QuickTime icon and drag it into the Trash. Then all you need to do is right click on the Trash and then click on the Empty Trash option to complete the uninstallation process.

All you need is a Mac, as the tools provided for the process are only available in OS X, and a USB drive with a capacity of 8 GB (or more, depending on what you have lying around), as the setup file is rather large. An Internet connection is not even required as everything you need is already on it.Creating a bootable OS X 10.10 Yosemite USB drive is very easy. You can use it anytime and anywhere to get the operating system running, quickly, on any compatible Mac.

If that does not work and you are running QuickTime 5, QuickTime 3, QuickTime 4 or QuickTime 6 then you will need to open the QuickTime installer (if you don't have a copy of the installer then download a new copy). Click agree until you appear that the choose installation type window, and then select the custom option where it will give you the option to uninstall QuickTime. You will receive a command prompt telling you to close down all of your other applications, and you'll need to click continue. This will successfully remove QuickTime from your system, however, it will leave Sound Manager behind. If you want to remove that as well, you can open the extensions folder and remove it to the Trash.

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Troubleshooting

If you are having problems uninstalling QuickTime and believe me you can have problems with this depending on your setup and what you do, here's two helpful tips:

1. If all else fails, there's an application you can download (here). When you activate it, it will uninstall QuickTime automatically. This application will remove not only QuickTime but also any associated files, registry entries or extensions that have been created completely from your Mac. A full set of instructions for using Max Uninstaller can be found via the hyperlink at the start of this paragraph.

2. Before you attempt to uninstall QuickTime be sure to back up your registry in case of data loss, or any accidental errors causing problems with your Mac. If the data is correctly backed up you will be able to restore you Mac back into the condition it was in before you tried to remove QuickTime.

Please note that uninstalling QuickTime can be a complex and risky task, particularly if you are attempting manual removal. It involves key parts of your computer system, and it is only recommended for advanced users. If you haven't got any experience in this area it's best to ask someone that has.

Apple released the first version of QuickTime on 2nd December 1991 as a system add-on. It was developed by a man called, Bruce Leak who ran the first public demonstration during May 1991 during the World Developers Conference. It was an outstanding technological breakthrough at the time, particularly as Microsoft didn't release QuickTime's main completing product until November 1992. Since its initial release there have been 8 different versions all offering substantial improvements on previous versions of the software.

Cutting Videos: If you quickly want to reduce the length of a video you can do so very easily in QuickTime by going to the edit menu and selecting 'trim'. The thumbnails will appear at the bottom of the video and all you need to do then is drag the yellow box over the area you want to save.

Combinations: You can quickly combine one or two clips together to make a movie. Open the video that you want to start with, and then find the video that you want to add to it in the Finder and drop it directly into QuickTime. It will appear at the bottom of the window and then you can drag and drop it to wherever you like in the video.

Recordings: If you want to record what you are doing on your Mac all you have to do is open QuickTime and in the menu choose File, and then, capture what you're doing on-screen.

Export Audio Only: If you want to export only the audio you can do so by going to File > Export which will give you the choice over the type of file that you want to export. If you click the drop down box of the export window and choose audio only it will only grab the sound – which is perfect for voiceovers.

Slower Fast Forward: If you hold down the Alt or Option Key as you click the QuickTime fast forward button the speed of the video will be increased at a slower rate which is perfect if you are trying to closely examine the video paying particular attention to detail.