Forum Discussion
Why quicktime not playing mp4 files on mac and windows pc?
It is an MP4 video file downloaded from Bluesky app. When I was trying to play the mp4 file on my Mac, this error message pops up: This file contains some media which isn’t compatible with QuickTim...
You're wondering if messing around with QuickTime not playing MP4 on Mac or trying to fix the MP4 playback issue is risky? I’ve been there myself, and honestly, it’s usually pretty safe to tinker with QuickTime settings or even reinstall it if needed — as long as you get the official version from Apple.
Here’s my take based on my own experience:
- QuickTime is pretty straightforward. If QuickTime not playing MP4 on Mac, it’s often a codec problem or a glitch.
- Usually, uninstalling and reinstalling QuickTime (or updating it) helps. No biggie there.
- Just make sure to get the official installer from Apple’s website. Avoid shady sources, because you don’t want malware sneaking in.
Potential risks:
- If you’re trying to tweak system codecs or mess with system files, that’s where things can go sideways.
But for QuickTime itself, just reinstalling or updating it is generally safe. - Also, avoid messing with registry entries or system files unless you’re super confident — that can cause more headaches.