Publishing to mp4 almost doubles the file size

I have been trying to find someone in the forum with a similar problem but with no success. I hope someone can help me.
I have a Captivate 7 file that is 59 MB.
The resulting mp4 file after publishing is 107 MB.
When I publish the same file to swf it is 18 MB.
Why is the mp4 file so large and how can I reduce its size? I did not have this problem in Captivate 5.5. The mp4 file always was smaller than the cptx file.
There was one strange thing with this file. I had imported 5 images that were around 300K in size and in the Captivate library they showed up as huge files (I think it was something like 60MB per file). I deleted the images from the library after I discovered it and just imported new versions ofthose images. That solved the problem in the library. Could this have something to do with the size of the mp4 file.
I have already tried to create a new project and just copy all slides over. That did not make a difference.
Here is a screenshot of my file sizes
Any help is very much appreciated.
Angela

RodWard, thanks for your answer. I wanted to publish using Cap 5.5 but I wasn't able to get my Cap 7course into Captivate 5.5. Whenever I tried to copy the slides or even objects from 7 to 5.5., I got an error message. How can I publish a course using Captivate 5.5. if the course is created in Captivate 7.
I have checked every setting three times and they are all correct meaning they are the same as I had them in Captivate 5.5.
I also tried to create a new project and pasted all slides into the project, then published it. That made no difference.
I have created 20 of theses courses in Captivate 5.5 and they all have the same parameters (it's a series of youtube videos https://www.youtube.com/user/BAEXPERTS). No exercises, no screen recordings, just images, voiceover, and some animation. They always have a similar length and the 20 of them that I created in Captivate 5.5 had around 20MB to 40MB and this one is 105MB. The whole course/video has only 19 slides. In all my other 20 videos/courses, the mp4 file is smaller than the Captivate file.
Also, I am not sure whether this is related, but Captivate 7 crashes many times a day (sometimes every 15 minutes - it looses the ability to paste and when I close the program to restart Captivate 7, it crashes). It seems to be related to my using the clipboard to paste images. Since I use many images in my videos/courses it is too time consuming to save every file. I usually open them directly from an online source in Fireworks and then paste the image into Captivate. I always open it as Administrator because I read that on the forum but it hasn't helped. Captivate 5.5 also lost the ability to paste on a regular basis but it never crashed when I tried to close Captivate as a results of this loss of functionality.
Thanks, Angela

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