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New Progressive Download Capability for Warpwire

By: Todd Stabley

One of the cool features we rolled out out in our last major Warpwire upgrade is an option for progressive download. This work has grown out of our involvement with Duke global programs, such as our campus at Duke Kunshan University. Specifically, we’ve noted that in situations that combine low bandwidth with high network latency, we can reduce video buffering and significantly improve the end user experience by delivering the files via progressive download rather than the standard HTTP Live delivery method Warpwire currently uses by default.



We’ve updated our Warpwire FAQ ( to reflect this new capability as well as to include minimum technical requirements for using Warpwire. I’ve clipped the relevant info below:

What are the minimum technical requirements for using Warpwire?

Network Speed:
  • Viewing videos at 360p requires 1.0 Megabit per second
  • Viewing videos at 480p (SD quality) requires 3.0 Megabits per second
  • Viewing videos at 720p (HD quality) requires 5.0 Megabits per seconds
Latency (sometimes called “ping”):
To stream videos effectively via Warpwire’s default method (currently Apple’s HLS protocol), your network latency (“ping”) should be no greater than 150ms.
Test your network speed and latency (“ping”) here:

My Warpwire videos keep buffering. What can I do to improve performance?

If your videos keep buffering (i.e., showing three moving dots on top of the video), test your network connection for bandwidth and latency via If your bandwidth and/or latency are close to our minimum recommended thresholds, switching the media libraries to Progressive Download may help. To do that, contact the OIT Service Desk ( if you own the Media Library or Libraries containing the problem files and provide the name and URL of the Libraries in question. If you are not the owner, contact that person (the person who shared the files with you) and request that they contact the OIT Service Desk to switch to Progressive Download or make other arrangements to share the file/s with you.

Please note that if you do not have a bandwidth of at least 1 Megabit per second, your best option may be to request that the owner of your Media Library or Libraries move the files to Duke’s site where you can download the videos and view them on your local hard drive. 



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