Choose Tools | Options, and select the Advanced tab.
In the Default durations section, change the Picture duration to something like 10 seconds. If there's not too much text on your slides, change it to something like 7 seconds. If your slide PNGs are chock-a-block of text, change it to a higher duration. Let the transition duration remain at 1.25 seconds.
In the Video properties section, choose between NTSC or PAL. NTSC is the video standard used in USA, Japan, and many other countries. Many European countries and India use the PAL standard.
You might also want to change the Aspect ratio to 16:9 if your original PowerPoint presentation was a wide screen presentation. Otherwise, leave it at 4:3.
