From MPEG layer-3 to MPEG-4??

Hi,
I have exported a QT slide show from iPhoto 4 and resulted with a MPEG layer-3 Audio. In the past, I'm not sure how I did it, but I do have another slideshow that was an MPEG-4 Video with a ".mov" extension, and this later one, when posted on .Mac account webpage, does automatically start playing as it download. But the MPEG layer -3 does not. So with QT 6.5.3, I tried to export the file using the expert settings, and did 3 separate attempts. 1-Movie to Hinted movie, 2-Movie to MPG-4, movie to Quicktime Movie. And all resulted in a MPEG Layer-3???
Not sure what's happening.
Now the other thing, when I use Movie to MPEG-4, the extension changes to .mp4, but the movie that is working properly on my webpage that is an MPEG-4, does have ".mov" extension!
What should I do ?
Michel

Colin,
it makes sense that it is compressed with an mp3 song attached to it. iPhoto4 export slideshow to QT in a manner that you described. Uou can see that all photos are exported one after the next, and at the end you can see the iP, is adding the audio, which is the Mp3 songs. This allow the file to remains small. I look at the FPS and Movie FPS is .57, Playing FPS is .67, instead of the 30FPS.
When you export from a created slideshow in iP5 or 6, the QT file becomes much bigger, because I think it creates 30fps for every picture (essentially 60 frames for one pic displayed for 2 seconds) because of the Ken Burns effect that requires this.
If I understand it right, iP4, exports the first pic as one frame, and if it is displayed for 2,3, 4 or 6 sec, it repeats the 1st (original) frame 59 or so times, essentially not having to copy the same frame more than once, otherwise it would make the file way too big. This compression used by QT from ip4, keeps the file size fairly small. In fact the biggest items in the QT file, is the song. i.e., when I export the slide show with no songs, the resulting QT file can be, say, 500KB. If I export the same slide show with a songs, the File increases by the same size of the MP3 songs size Say 4MB. Assuming that the songs palys in its entirety.
Do I understand this right?
Anyway, I tried exporting with Movie to Hinted Movie (pull down menu) and it remains in a MPEG LAyer-3???
Back to my original question? I'm trying to create a .mov, hinted, but that list (command +I) while playing
MPEG-4 Audio, Mono 44100HZ
MPEG-4 Video, 320X240, Millions
Movie FPS :30
When I export the pull down menu contains a multitudes of choices:
Movie to 3G
Movie to AVI
Movie to BMP
Movie to DivX AVI
Movie to FLC
Movie to to Hinted movie (I tried this one)
Movie to image sequence
Movie to MPEG-4 ( I also tried this one)
Movie to picture
Movie to Quicktime Media link
Movie to Quicktime Movie
Movie to Toast Video CD
Sound to Aiff
Sound toSystem 7 sound
Sound to Wave
Sound to uLAw
PLease lead the way!!!
michel

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