This works fine locally, but the link will fail on a Windows CD or a UNIX Web server. Use lowercase .mov for the file extension. If you capitalize any letters in the filename, be sure all links to the movie use exactly the same capitalization. MyMovie.mov is not equal to mymovie.mov . Remember that a movie is made of tracks.
Tracks contain references to media samples such as sound or video.
When you make a movie self-contained, any references to data in external files are resolved, and copies of the data are stored inside the movie file itself. What's more, the data samples are interleaved for smooth delivery. It also stores the byte offset into the files for each media sample. For such a movie to work, the data files cannot be edited, moved relative to the movie file, or renamed. Any directory names in the relative path must also remain unchanged.