Exported slideshow MP4 file not compatible with Quicktime or Mac Photos

Question

I have created numerous slideshows in LRC with music and successfully exported them as MPEG-4 files. However, I now find that they will not open in Quicktime or Mac Photos. The manual states that LRC saves them as H.264 MPEG-4 files, and that they can be opened in Quicktime and Photos, but the attached error message says otherwise.

johnrellis · Accepted Answer

"I have made a short slideshow but this one opens ok in Quicktime (attached)." It would help to see one that doesn't play on your computer. If it's too big to attach it here, upload it Dropbox, Google Drive, or similar, and include the sharing link here.Also, just to verify, have you restarted your computer?  LR's helper apps (which run in background) for making videos are a little flaky.

johnrellis · Answer

I did a quick test on my LR 12.3 / Mac OS 13.4 -- I exported a 1920 x 1080 slideshow as a .mp4, and it plays in Quicktime without issue.

To narrow down your issue:

1. Please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running.

2. Make a very short slideshow .mp4 with the problem and attach it to your reply here.

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