Because it’s Friday: Stochastic degradation

June 4, 2010

(This article was first published on Revolutions, and kindly contributed to R-bloggers)

When you upload a video to YouTube, they don’t store a perfect digital copy of your media file. The video is actually re-encoded into the MPEG-4 video format. This saves space on YouTube’s servers, but also introduces some random degradation to the video (as a result of the lossy compression process).

So what happens if you then save that converted video, and upload it to YouTube again? The video (and audio) is degraded a little bit more. And what if you repeat that process 750 times? Here’s the result:

Althouse:  I was thinking that the problem of making a copy of a copy of a copy had become a thing of the past because of digital files.

To leave a comment for the author, please follow the link and comment on their blog: Revolutions. offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...


Comments are closed.

Search R-bloggers


Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)