If your macOS is outdated, update the system. So, if the macOS is old, the version of QuickTime Player is also old, but there is often a problem that MP4 cannot be opened. The latest version of QuickTime Player, which comes standard with Macs, ships with macOS. This is the only way to fix MP4 files that cannot be played on Mac. Click " Save" to output a specific video or click " Save All" in the lower right corner to save everything.
Step 3: A pop-up window will tell you that the video has been repaired successfully. Step 2: Once done, you will be able to see the file name, size, length and resolution of the imported MP4 video. Step 1: After downloading and launching the software, click the " Add Video" and select the MP4 that cannot be opened. This can also be fixed by installing a codec program. When playing MP4, the player cannot play without the program of this standard. 2 QuickTime Player Not Compatible with MP4 file CodecĪ codec is a program used to compress video files such as MP4. You can easily improve it by checking if the version is outdated and updating it. If the version of the software is old, it may not be possible to play the video. Many people use QuickTime Player, which is standard on Mac, to play MP4. (to the fastest MP4 repair method) 2 Outdated Version of QuickTime Player Check if there is a connection problem or if you are doing something else during the transfer. For example, if you remove the USB memory while transferring it from the USB memory to the Mac, the file may be damaged. Most likely the MP4 file you are trying to play is corrupted. Knowing this will help me deal with this issue again in the future. From here, I will explain the reasons why MP4 format videos cannot be played on Mac.
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