iWeb: Some movies on pages created by iWeb may not play in a browser

Issue or symptom

Some movies added to pages in iWeb may play properly before being published, but do not play properly once published and viewed with a browser.

Solution

This issue occurs with DivX-encoded movies. If you are creating your own movies, use H.264 to encode them. If you have a movie that is already encoded with DivX, you can do the following:

1. Open iTunes.
2. From the File menu, choose Add to Library... and add your movie.
3. Select the movie in your iTunes library.
4. From the Advanced menu, choose Convert Selection for Apple TV.
5. After iTunes has finished converting the movie, drag the new movie file from the iTunes library to your Desktop.
6. Replace the DivX-encoded movie in iWeb with the newly created copy from your Desktop.
7. Republish your site from iWeb.