MIT experts find a way to reduce video stream buffering on busy WiFi

MIT experts find a way to reduce video stream buffering on busy WiFi

Is there anything more irritating that trying to watch a video on a slow internet connection shared with a set of other users? Skips, endless buffering, and ugly pixelation can spoil the experience of watching a movie or TV show when everyone in your house is trying to stream at the same time. Now a team from MIT has come up with a tool to help multiple people share a limited WiFi connection. The group from the Computer Science and Artificial Intelligence Laboratory (CSAIL) have developed the Minerva system which analyzes videos before playing them to check how much they would be impacted by being played at a lower quality.

Traditional protocols for WiFi sharing simply share the available bandwidth by the number of users. So if you’re trying to watch an HD sports match on your TV and one of your kids is trying to watch a cartoon on their smartphone, you’ll each be allocated half the available bandwidth. That’s fine for your kid but bad for you, as fast-moving videos like sports events suffer more from low bandwidth than other types of videos like cartoons.

Minerva can analyze both videos in an offline phase to see which would benefit from being allocated more bandwidth and which could be served using lower bandwidth without the quality suffering. The protocol then allocates bandwidth based on the needs of the different users, and will adjust itself over time in response to the video content being played.

In real-world tests, Minerva was able to reduce rebuffering time almost by half, and in one third of cases was able to offer improvements to video playback quality that were the equivalent of going from 720p to 1080p. And the system doesn’t only work within households. The same principle could be used to share internet connections across entire regions, making it suitable for companies like Netflix and Hulu which have to serve video to large numbers of users.

The system can be introduced by video providers without changing any hardware, making it essentially a “drop-in replacement for the standard TCP/IP protocol” according to the team.


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Susan Hairston

Susan Hairston is the most unlikely to be mistaken for the techno whiz that she actually is! Her frame and appearance tend to lead people to assume that she conforms to stereotypical behavior by a lady, but truly, her interests lie in all things tech! She leads the way when it comes to reviewing software updates, patching better versions into existing apps, and writing articles which focus on the impact, a certain technology will have on the world! In her downtime, she can be found coding away at her computer!
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