China to Promote Own Alternative to DVDs, EVD

supermanksu writes "Seeking to compete on its own terms in the lucrative entertainment industry, China announced a government-funded project Tuesday to promote an alternative to DVDs and 'attack the market share' of the global video format." This has been an ongoing project.

Comments

Fractals the Grassy Knoll of compression

[benwaggoner]

Er, sounds good, but you actually don't really know what you're talking about.

A well encoded DVD has very high quality, certainly on par with Betacam SP, the high end analog broadcast production format before digital took over. A well encoded disc won't show significant artifacts.

HDTV resolution goes up to 1920x1080, which is about 6.5x the pixels of DVD (720x480). How high do you want to go? The cheapest displays that can meaningfully do more than 1920 lines wide on a largish screen are awesomely expensive.

Today's displays are crappy? Compared to what? A tapestry? IMAX? We're really at the beginning of a golden age for consumer video technologies. The quality you can buy for $5000 is vastly improved in the last three years, let alone the last 30. Most people don't have eyes good enough to appreciate anything beyond a good 1920x1080.

Lastly, fractals are really the Grassy Knoll of video compression. Yes, Iterated was created to make products on them. No, fractals didn't work. I spent a lot of the mid-late 90's working with Iterated's stuff in different forms. Bitrate scalability was interesting (you could truncate the file at any point, and the more bits you grabbed, the better an image you got). Compression ratios were somewhat better than JPEG. They scaled pretty well. But the net gains were too small to overcome the market share advantages of lowly JPEG.

Iterated simply couldn't make a business around fractal compression. They sold their stuff to AltaMira, who still are selling their fractal compression stuff. Iterated morphed into a company providing image management solutions for the prepress industry. There was still some fractalish stuff underneath, but that wasn't where the value was really added.

The big thing about "fractal" compression is that it wasn't really fractal - its ability to take advantage of self-symmetry was very limited. Heck, even with today's computer power, a "true" fully automatic fractal compressor would take unbelievable amounts of CPU power - many orders of magnitude beyond what realistic video codecs do today. You're basically extending motion search into so many axes.

The only fractal video codec was ClearVideo, which was interesting I suppose, but was roundly stomped by both DCT H.263 derived codecs, and VQ derived codecs like Sorenson Video 1.

Almost everything good about fractals has been inherited by wavelets. And wavelets have also inherited fractal's difficulty in handling motion estimation. That's why DCT and DCT-derived codecs still rule the roost today. Wavelets are great for still image, but no one has come close to devising a really competitive wavelet motion codec.

Maybe someday we'll have a revolution in codecs, but DCT-based codecs like WMV9 and AVC keep on trucking in providing excellent compression efficiency, scalability, and decoder performance.