Monthly Archives: May 2010

Analysis of Google’s VP8

From Jason Garrett-Glaser’s analysis of Google’s VP8 (emphasis mine):

But first, a comment on the spec itself.

AAAAAAAGGGGGGGGGGGGGHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!

The spec consists largely of C code copy-pasted from the VP8 source code — up to and including TODOs, “optimizations”, and even C-specific hacks, such as workarounds for the undefined behavior of signed right shift on negative numbers. In many places it is simply outright opaque. Copy-pasted C code is not a spec. I may have complained about the H.264 spec being overly verbose, but at least it’s precise. The VP8 spec, by comparison, is imprecise, unclear, and overly short, leaving many portions of the format very vaguely explained. Some parts even explicitly refuse to fully explain a particular feature, pointing to highly-optimized, nigh-impossible-to-understand reference code for an explanation. There’s no way in hell anyone could write a decoder solely with this spec alone.

And the result of this type of spec?

The encoder and decoder share a staggering amount of code. This means that any bug in the common code will affect both, and thus won’t be spotted because it will affect them both in a matching fashion.

A patch to fix a bug in the decoder has already been removed instead of fixing the same bug in the encoder.

Sony NEX-5 Review

The NEX-5 is Sony’s first attempt at a mirror-less camera with interchangeable lenses. A very good attempt too, and its even smaller than my Panasonic GF1 even though it has a bigger sensor and articulated screen.

Another iPhone 4G Leaked

Another fourth-generation iPhone has fallen into the wrong hands, this time to a Vietnamese forum. They claim a Vietnamese businessman bought it in the US and bought it back to Vietnam.

This one seems closer to a production model than the one Gizmodo bought; it has a storage capacity marked on the back, the screws on the bottom are gone, and it actually boots. Looking closer at one of the photographs, it does appear that the new iPhone has a much higher resolution than older models.

‘Near-Final’ Windows Phone 7 Screenshots

It’s a distinctive look, although not exactly pretty.

Apple iPad UK Pricing

iPad pricing in the UK is out. 16GB: £429, 32GB: £499, 64GB: £599. Plus another £100 if you want 3G.

Removing UK VAT (at 17.5%) and converting the price to USD at $1.47 per GBP, a UK iPad is slightly more expensive than the equivalent US sold model.

Model UK Price US Price Difference
16GB WiFi £429 $499 +$35.70
32GB WiFi £499 $599 +$23.28
64GB WiFi £599 $699 +$48.38
16GB WiFi+3G £529 $629 +$32.81
32GB WiFi+3G £599 $729 +$20.39
64GB WiFi+3G £699 $829 +$45.49

No news yet on the cost of a 3G data plan.

Kanellos the Greek Protest Dog

Kanellos the Greek protest dog

A dog that has been seen at nearly every demonstration in Athens over the last two years has turned up again during the recent protests against new austerity measures.

weiranzhang.com

New work website, something I’ve been meaning to do for a while.

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