Entries by tag: demo

xiphmont

Introducing Daala, part 3: Time/Frequency Resolution Switching

I've just posted part 3 in my demo series introducing the Daala video codec. This one is kind of a long one, mainly because I think it's one of the only really detailed presentations of a technique Jean-Marc Valin of Xiph invented and first introduced in the Opus audio codec: 'TF' aka Time/Frequency resolution switching.

Even better... while I was documenting TF for posterity, I spotted a possible improvement. So, I've tossed in documentation of a brand new technique as well!

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xiphmont

A new demo page for the Opus 1.1 beta release

I've made another demo page, this one in celebration of the Opus 1.1 beta release today...

"Opus marches onward toward its manifest destiny with today's beta of the upcoming 1.1 release. This will be the first major update to libopus since standardization as RFC 6716 in 2012, and includes improvements to performance, encoding quality, and the library APIs. Here's a few of the upgrades that Opus users and implementors will care about the most."

Cheers!

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xiphmont

Death By Graphs (a new Ghost update/demo)

I'd mentioned in the previous update that we're (Xiph is) using a chirp estimation algorithm that we published back in 2007, and that the original paper has precious little space to devote to describing in detail how the algorithm actually performed. One of the upshots of not having done extensive characterization tests of our own algorithm was that it has already surprised me a few times this year (in both good and bad ways).

Therefore, Ghost Update 20110604 concerns itself with describing and graphing algorithm behavior in mind-numbing detail.

Death! By! Graphs!


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