MP4 made with iMovie contains metadata that Subler does not show?

[Matt R]

A movie file exported from Apple iMovie contains a title and description that do not appear in Subler. Not sure if this is a bug or would be an enhancement to allow editing.

Sample file attached. Subler 1.6.5, macOS 10.15.5, iMovie 10.1.14.

To reproduce:

1. In iMovie, create a project. I hadn’t used it on this Mac, so the default project title was My Movie 1
2. Add media to the project so you have something to output.
3. File menu > Share > File…
4. The export dialog will have the project title and a default description (This video is about My Movie 1). Do not change them. You can adjust quality settings for faster export.
5. Click Next to save the file. Use a file name that does not match the project title, like export.mp4.
6. Open the file in QuickTime Player.

7. Observe:

   1. In the window’s titlebar, you see the iMovie project title instead of the file name.
   2. In the movie inspector (Window menu > Show Movie Inspector) you see both the title and description from iMovie.

8. Open the file in Subler.

9. Select the Metadata track.

Expected result: the title and description should appear as metadata items.

Actual result: no metadata appears.

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[Damiano Galassi]

That iMovie mp4 uses a different metadata format.