Information Technology Services

Drop Shadow



Have audio, video or presentation files but are not sure if they are optimized for podcasting? Contact Instructional Media Services (IMS) for assistance. You can also have a look at our File Types and Settings page.

MS PowerPoint:

More of PC person? No Problem. You can narrate PowerPoint presentations and publish them also. These would be ready for the streaming server, but would need to be converted for use on iTunes U and the USD Podcasting server. You can import them into Mac Keynote and publish that way. For other options, contact Instructional Media Services (IMS).

General File Format Guide:

  • You’ll want to save as .mp3 files for audio, or either .mov or .mpg files for video. If you need to use another filetype, let us know, but those formats will have the widest appeal for podcast files.
  • You can convert audio files to mp3 using software such as iTunes, or with a special add-on for Audacity. The video software above will automatically save video as .mov files.

  • You’ll want to optimize your file for people to download - these media files tend to be very large and take time to download. Even a 10% reduction in size can shave sixty seconds or more off of the download time of what would have been a 10-minute download.

  • A good rule of thumb is that audio should be no more than one megabyte per minute, probably about half that for most voice podcasts.

  • Video is a lot more difficult to provide even a rule of thumb for, but you should try for no more than six megabytes per minute for most podcasts; if there is a lot of camera motion in the video, it might rise to ten to twenty megabytes per minute. 320 by 240 is a good choice for video width and height, or 480 by 320 for larger videos.

  • If you want to be able to resize movies and reformat them to different formats, Quicktime Pro is inexpensive on both Macintosh and Windows platforms.