Fix QuickTime Player Can't Open MP4 or MOV

How to fix the QuickTime player can't open the MP4 or MOV video file on Mac? Learn how to fix this problem by fixing corrupted videos with a free video repair tool, using a different code, opening the video file with another video player, and so on.

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EaseUS Fixo


  • Fix videos with different issues, such as broken, unplayable, no sound, etc.
  • Repair corrupted images and enhance their quality with advanced AI algorithms.
  • Fix documents in various formats, including PDF, Word, Excel, and PowerPoint files.
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QuickTime is one of the most popular built-in media players on Mac. This media player lets Mac users enjoy various file formats, personal media, and internet videos in remarkably high quality. It has a simple design and easy-to-use controls that make it convenient for all Mac users.

This multimedia player is quite popular due to its following features:

  • It has an uncluttered interface that makes everything you wish to watch more enjoyable.
  • It supports various Window formats like MPEG-4 files (MP4, MP3, m4V)
  • QuickTime Player has a handy slide that lets you enjoy your movie at any playback speed you wish.
  • It offers its users a pristine video quality that gives everything you wish to watch brilliant quality.

All these features make this video player one of the most preferred video players on Mac. But sometimes, you can't open a file on QuickTime; why's that?

Why Can't QuickTime Player Open the Video File

Sometimes QuickTime can fail to access your video file. It can be very disappointing as you might want to play an important business video for your boss or might want to watch your favorite web series. Before jumping in on how to fix such an issue, it's important that you find out what the probable causes leading to the videos not being played.

There can be several reasons that can lead to stopping the video player from playing your video. Some of those reasons can be:

  • Your system is infected with Malware. You might want to scan your Mac with reliable anti-virus software.
  • The video file has a codec missing.
  • Your file got corrupted
  • Your Mac has some internal errors in its software
  • QuickTime Player's internal issue. Your version might be outdated and you need to update it.

Whatever the reason, you can still play your videos using a suitable method to fix your issue.

How to Fix the QuickTime Player Open Issue Efficiently

Here are five methods to help you fix your QuickTime player not playing my video issue:

Fix 1. Repair Corrupted Videos with EaseUS Fixo Video Repair

EaseUS Fixo Video Repair is a video repair tool for Mac users. It can repair corrupted videos on Macs, SD cards, external hard drives, SSD, HDD, and other storage devices. You will only need to add the corrupted video to fix it with one click. 

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It has an advanced video repair option. If the video repair failed, you could add some sample videos to help this tool analyze and repair your corrupted files on Mac successfully. We have prepared a tutorial with pictures. You can check the following steps if you don't know how to operate it:

Step 1. Launch EaseUS Fixo on Mac

Download EaseUS Fixo on your Mac and launch it. Click "Video Repair" on the left and click "Add Video" to upload your corrupted MP4/MOV/MKV/3GP video files.

Launch EaseUS Fixo on Mac

Step 2. Select the corrupted video and start repair

Select a targeted video and click the "Repair" button to start the single video repairing process. If you want to repair all the videos, select them all and click "Repair All".

Select the corrupted video and start repair

Step 3. View and save the fixed videos

Wait a few minutes, and the corrupted videos will be repaired. The time you wait depends on how corrupted your videos are. Then click the "View Repaired" to preview the videos. To save the fixed video, hit the "Save" button. Keeping multiple videos is okay. Just choose "Save All" to complete.

View and save the fixed videos

Step 4. Run the advanced video repair process

If the quick repair doesn't work, try the advanced repair mode. Choose "Advanced Repair" to start the process. After uploading an example video, select "Confirm".

Run the advanced video repair process

Step 5. View and save the video repaired in advance mode

A window of detailed information about the corruption and sample videos will pop up. Click "Repair Now" to start the process. When the repair is complete, you can view the fixed videos and click the "Save" button to keep the repaired video files on the path you want.

View and save the video repaired in advance mode

Fix 2. Use A Different Codec

Digital videos are compressed to adjoin different multimedia streams like audio and videos, and this connection comes into place using a codec algorithm.

Codec is also used to convert digital info into a readable format. So if your file is unable to open on QuickTime, there is a chance that your Mac is not prepared to read this video's codec. To find out the codec of your file, you can follow these steps:

Step 1. From the Windows tab of the opened video file, select "show movie inspector".

select show movie inspector

Step 2. A dialogue box will appear showing the video's source, format, FPs, size, data size, and data rate. You should look out for “Format" to view all your media's codecs.

view codec in format

Here are all the audio and video codecs supported by QuickTime:

Video Codec: MPEG-2 (OS X Lion or later), MPEG-4 (Part 2), H.264, H.263, H.261

Audio Codec: AAC (MPEG-4 Audio), HE-AAC, Apple Lossless, MP3

Check if your video has any of these formats. If not, activate the required Codec support. You can download third-party apps as well to assist QuickTime to recognise all the video and audio formats.

Fix 3. Play Files Using a Different Media Player

If the above method does not work for you, you can use a different media player installed on your Mac device. VLC and Mplayer can be used whenever you experience a playback issue on your QuickTime media player.

Here are some steps that you can follow to play your videos on VLC instead of QuickTime:

Step 1. Install VLC Player on Mac and right-click on the video file that you want to play on the VLC player.

Step 2. From the appeared options, choose "open with" a dialog box will appear; from the box, select the "VLC Player" option.

open video with vlc

Once all the steps are completed, your video is ready to be played in the VLC Media Player.

Fix 4. Convert the File Format to QuickTime Supported Format 

If your file doesn't play on QuickTime, try transcoding the original video into an encoding format supported by the QuickTime player. You can change the extension by renaming the file. Replace the .mp4 extension with .avi in the file's name.  

You can also download other third-party software which can convert videos to QuickTime player-compatible format.

Fix 5. Repair Your Corrupted Video Files with EaseUS Online Video Repair

Sometimes, your video can get corrupted, causing your video to be unplayable in the QuickTime Media Player. To repair your lost/damaged video and make it payable on your QuickTime Media Player, you need professional and 100% safe video repair software. 

 EaseUS Online Video Repair is a free video repair tool that can help you with unplayable videos. It assists you in fixing broken videos in recording & shooting, converting, and transferring.  EaseUS free video repair tool allows you to repair damaged videos on variable devices, such as repair YouTube videos, or fix video files from PC, Mac, and mobile devices. 

Additionally, it supports all the video formats you might need, including .mp4, .mov, .mkv, .avi, mpg, and many, many more!

Step 1. Open EaseUS Online Video Repair and Upload Problematic Video

Open EaseUS Online Video Repair page:, click "Update Video", or drag and drop a corrupted, broken, or not playing video to the right area to upload.

Upload video

Step 2. Enter a Valid Email Address and Start Repairing Video

Enter a valid email address and click "Start Repairing" to upload and repair the malfunctioning video.

enter email address

Step 3. Wait for the Automatic Uploading and Repairing Process to Finish

This online repair tool will automatically upload and repair the corrupted or broken video for you. You can leave the repairing page opened and continue doing other stuff.

  Uploading and repairing video

Step 4. Enter Extraction Code and Download Repaired Video

When the repairing process completes, you can preview the video at the right pane. Also, you'll receive an email with a video extraction code.

Go and find the code, reopen the online repair. page. Then click "Download Video" and enter the extraction code, click "OK" to start downloading the repaired video.

Enter extraction code, download the repaired video

Fix 6. Install the Latest Version of QuickTime

If your video is not playable on your QuickTime, try installing the latest version of QuickTime. QuickTime 7 Pro is the newest media player that can handle all video formats and lets you play and open any video file without causing any trouble.

To check your version, click on the tab ''QuickTime Player'' and then ''About QuickTime Player''. 


QuickTime can usually play your videos without causing any codec error, but sometimes it may cause you trouble playing your video. All the abovementioned methods are equally beneficial for playing your MP4 or MOV videos on QuickTime. By simply reading and following the steps, you can solve all your QuickTime Player can't open my files issues.

Also, it is worth mentioning that the EaseUS Fixo Video Repair is one of the best tools to repair your videos and let you play them on your media player without harming your file's audio or video quality. You can download this software and feel free from the tension of losing your video.

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About the Author

author Cedric


Cedric Grantham is a senior editor and data recovery specialist of EaseUS. He mainly writes articles and how-to tips about data recovery on PC and Mac. He has handled 10,000+ data recovery cases and is good at data recovery of NTFS, FAT (FAT32 and ExFAT) file systems, and RAID structure reorganization.

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