As explained in Photo Booth help, 4-up snapshot is exported as an animated GIF image.
http://docs.info.apple.com/article.html?path=PhotoBooth/1.0/en/11572.html
On my PPC Mac, exporting a nine second movie made in Photo Booth with a file name of xx.mov resulted in a one second movie of the first frame that Photo Booth recorded. In short, I got a one second movie with no movement.
I did a test and was able to successfully convert a two second test movie made in Photo Booth to an animated gif using the following process:
(1) I first used
QuickTime Pro to export the movie to an image sequence of one tif image for each of the movie's frames.
(2) Then I used Photo Shop Elements (PSE) to create an image of thirty layers and copied each movie frame image into its respective layer. (If you don't have PSE, any image editor that can create animated gifs could be used instead.)
(3) However, when I tried to create the animated gif from this layered image, PSE reported that the file was too big to convert to a gif and suggested that I either resize the image or reduce the number of layers. Because you plan to use your gif as an avatar, I resized the image from its original 640x480 to 48x48. This image saved immediately and plays well in Safari as an animated gif.
I note that my two second test clip yielded thirty images. At the 15 fps frame rate, your nine second movie would yield 135 frames. I did not attempt to create a gif that large, but I did replicate the layers several times to make an animated gif that has about 130 frames. It played well as an animated gif, too, but ran about four times longer before repeating than the original 30 frames.
The process I used is simple, but it takes some time. If you decide to try to convert your nine second video clip to an animated gif, you might want test a small segment first to be sure it behaves as you expect before investing the time to convert the entire file.
EZ Jim
G5 DP 1.8GHz w/Mac OS X (10.5.7) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight