Safari 18.1.1 not recognizing recently uploaded m4v files

Thanks for you feedback.

The issue may be related to corrupted backup files but these m4v files do play back nominally using Firefox and Brave and Chrome on my M2 Pro Mac mini. However, attempting to access the m4v's for our sites via the web using a phone or tablet using any browser causes the same file not found errors. I think we'll have to re-encode all these affected files which were created using Handbrake.

I did find a fix though. After consulting with Handbrake's support pages I was able to get Safari to read our video files by changing their file appendages from .m4v to .mp4. No kidding. Now Safari sees them.

So going forward when we need to re-encode our video content with Handbrake we will be designating all transcoded video media as .mp4 files.

Again thanks for the interest.

Upon further digging I found an option in the Safari Developer menu to set a browser tab's User Agent to the current Safari version. Doing so for any tab we use for our site(s) seems to eliminate these file format errors and allow large video files to display and run optimally. DGMS,