YouTube Engineering and Developers Blog: November 2012

Using WebM to power the YouTube app for Nintendo Wii

Thursday, November 15, 2012

When we began building the new YouTube app for Nintendo Wii, we wanted to make video playback smooth and beautiful. This meant squeezing the most available power from the console CPU and fitting the video decoding process within the tight bounds of available memory. After trying out several video encoding formats on Wii, we found that 360p WebM encoding performed the best. With the largest install base of current generation consoles, YouTube on Wii is the largest deployment of WebM video in the world today.

WebM is particularly well-suited to devices where available memory is limited, because of its technical approach to video encoding. VP8, the video codec in WebM, uses reference frames (called alternative reference frames, or "alt-ref") from which adjacent video frames are derived and compressed. This type of compression is commonly used in modern video encoding schemes, but VP8 uses the technique with particular efficiency, which results in a smaller memory footprint and smoother video playback on Wii.

We went one step further and performed low-level optimization of the VP8 decoder specifically tuned to the Wii’s processor. This included: using paired-single floating point operations to perform motion compensation, loop filtering, and idct; using the GPU to do color conversion and scaling; and dcbz instructions to copy buffers. This kind of optimization is available to anyone, as the VP8 code is open source under a BSD license.

We’ll keep looking into other ways we can use WebM, so stay tuned on this blog to learn more.

Fritz Koenig, Engineer, recently watched Phantogram - "Don't Move", and Matt Darby, Product Manager, recently watched “JP Auclair Street Segment.”

Upcoming HTTPS Certificate Change

Tuesday, November 13, 2012

If you’re a developer who uses the YouTube API, and if you make your requests to the API using HTTPS, there’s an upcoming change that you should be aware of. Sometime in early August 2013, Google will be changing the certificates used for establishing secure HTTPS connections to all of our servers, in what we anticipate will be a backwards-compatible manner. Still, since there are so many slight differences in HTTPS client implementations, we encourage you to test your existing code in advance of this change and to report any issues that you do encounter.
The new certificates are currently active on https://cert-test.sandbox.google.com/, and we recommend testing your HTTPS client implementation against that URL.
If you’re using HTTP instead of HTTPS to access the YouTube Data API then you also won’t be affected by the new security certificates—but you really should start using HTTPS!
This post on the Google Online Security Blog has more information about the upcoming change, which roll out in early August, 2013.
Cheers,—Jeff Posnick, YouTube API Team

Engineering and Developers Blog

Using WebM to power the YouTube app for Nintendo Wii

Upcoming HTTPS Certificate Change

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