SEE THE UPDATED VERSION OF THES INSTRUCTIONS, HERE:

http://www.sealevel.info/Happer_UNC_2014-09-08/Notes_-_how_to_make_a_movie_from_an_audio_recording_plus_powerpoint_slides.html


THIS IS THE OLD VERSION:

To make a movie from an audio recording plus powerpoint slides...

1. Load the .ppt or .pptx file into Powerpoint (I used Powerpoint 2003).

2. Save it as png format; it will prompt and let you save all slides as a folder full of individual .png files.

3. Exit Powerpoint.

4. (Optional) If there are more than nine slides, then rename Slide1.png through Slide9.png to Slide01.png through Slide09.png, so they're in the right order with the rest of the slides. (Alternately, you can fix the order in Windows Live Movie Maker, by dragging the slides around.)

5. Play the audio, while stepping through the slides, and note each slide name and the start time (hh:mm:ss) for each slide. Enter them in columns A (slide name) and B (hh:mm:ss) of a spreadsheet, respectively. (Set the format of Column B to hh:mm:ss in "format cells.")

6. Add a column C to your spreadsheet, with the start times in seconds. (The formula for C1 is "=B1*86400" [which is 24x60x60] then "Fill Down" for the rest of the spreadsheet column.)

7. Add a column D to your spreadsheet, with the length of each slide, in seconds. (The formula for D1 is "=C2-C1" then "Fill Down" to the 2nd-to-last row.)

8. Run Windows Live Movie Maker.

9. In Windows Live Movie Maker add all the .png files (slides) to your project. (You can also add other things, like .mp4 video clips.)
(Caveat: the presentation that I converted contained no annimations or fancy transitions. I don't know how those would work -- probably not well.)

10. Click on each slide, and set its duration, using the time in seconds from column D of your spreadsheet.

11. Check the start time of the last slide, and then go back and fix the durations of the previous slides which you got wrong.

12. Use "Add music" to add the audio track.

13. Save the movie project; it will be in .wlmp format.

14. Export the movie; it will be in .wmv format. (Note: this step is slow; it might take several HOURS for a long presentation at high resolution.)

15. Convert the move to .mp4 format, using Handbrake. Here are instructions:
http://www.howtogeek.com/199618/how-to-use-handbrake-to-convert-any-video-file-to-any-format/
Notes:
A. I used the "Optimize for Web" option, which might make video playback start quicker.
B. Converting to .mp4 shrinks the videos substantially: by 53% for my 640x480 version, 60% for my 720p version, and 63% for my 1080p version, compared to .wmv format.
C. Be sure to change the output file extension to ".mp4".