MP4 and MKV files not playing in mac os monterey 12.5

[addictive]

Last night I updated my rMBP (2015) to mac os monterey 12.5. I didn’t notice any difference until I tried opening video files (mp4 or mkv) in QuickTime or VLC. The videos will open but not play. Very occasionally I’ll get a single frame but nothing more, I can’t scrub through the timeline of the video it’s just a black screen.

I had no issue playing videos until this latest update.

Any suggestions? Is this happening to anyone else?

Will I just have to wait for another software update?

 

[Apple_Robert]

No problems on my 12" (2017) MB. Backup important files and then do a fresh install.

 

[Slartibart]

try to repair permissions and restart.

 

[bogdanw]

Similar problem, unfortunately solved by reinstall https://forums.macrumors.com/threads/video-playback-issue-after-12-5-update.2351896/

 

[Mer1In]

You might trying a MacOS system recovery/reinstall. Shut down, then restart but hold down the Option-Command-R keys at the chime. I typically do this a few days/week after a new OS update is available. It's done me pretty good.

You might also try the program "VLC". This plays mp4 and mkv files without any problem.

Official download of VLC media player, the best Open Source player - VideoLAN

www.videolan.org

Good luck!

-Merlin