After the H.264 decoder benchmark I did when DivX 7 came out, I got some comments that I misrepresented CoreAVC by using an outdated version. Recently, I repeated the benchmarks using the newest version of CoreAVC fresh from their website. I also used more computers to test the decoders on, and the results were very interesting.
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Over the last few years, I bought one specimen of all four generations of Apple’s iPod nano media player, mainly to make rePear compatible with each new model. (In fact, rePear’s main development target are iPod nanos.) Here are my thoughts about the benefits and drawbacks of each generation.
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For a very long time, this blog was run by WordPress 2.0.x – this was the current version when I started it, and I kept updating it for a while, but after I built the captcha, I stopped doing so. The reason is that I implemented my captcha as a direct hack in WordPress’ sources, not as a plugin, not even a my-hacks.php file. In the meantime, I some security holes appeared: I frequently found invisible spam injected into my posts. I have never found the actual hole through which they did this, but I disabled everything that could be problematic (all this Web2.0ey XMLRPC crap, for example). In particular, I excluded all hosts from a certain spam-friendly provider from my site. This helped a lot, until last week, when I suddenly found that my Windows 7 review has not only been altered, but replaced by invisible spam.
This was the point when I finally had enough – I upgraded the blog to WordPress 2.7 yesterday. To my great surprise, the test transition, performed on a local copy of the site, worked absolutely flawlessly. I could even re-use my theme without changes, which was my greatest source of fear. On the real server, there was still the little problem of the PHP memory limit which was too low for WP 2.7 (why on earth do they use more than 8 MiB, even without plugins and locales?!), but this has been fixed with a simple mail to my friendly webspace provider (thanks, Rafayel!).
Everything worked, except the captcha, which I reimplemented as a proper WordPress plugin today and activated just now. By the way, in the 22 hours without the captcha, I already got over a dozen spam posts. Sigh. Let’s see how long this installment of the site works :)
I usually write my demos using Microsofts C Compiler for Win32 and GCC for Linux. But how good does Intel’s compiler optimize? And can the performance of MSVC and GCC be improved using a clever selection of compiler switches? That’s what I wanted to find out, and so I wrote my own little benchmark based on some code of my demos and let it run through all these compilers with different options. The results are a little bit different from what I expected …
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Sorry, but this post has been vandalized by spammers that somehow altered the post text. If anyone has a saved backup of this post, please give it to me.
Today, DivX Inc. released the new version of its famous video codec. Usually, this is utterly uninteresting news, but not this time: Version 7 is actually not an MPEG-4 ASP codec like its predecessors, but a H.264 one, based on the implementation of MainConcept. This makes the codec a lot more interesting, especially since the decoder part is free (as in beer).
The H.264 software decoder situation on Windows was a bit complicated: There just was no perfect decoder. The InterVideo and CyberLink come only with their respective Blu-ray player applications, the one in QuickTime is complete crap, the Nero one doesn’t want to work in applications other than Nero’s own. So we only had ffdshow, which is open source, cool, but a little bit slow, and CoreAVC, which is blazing fast, but you need to pay for it.
As of today, this problem has been resolved once and for all: DivX 7 is the ultimate H.264 software decoder on Windows, period. I ran a little benchmark today and the results are very impressive: DivX 7 is always faster than CoreAVC, usually about 10% for CABAC sequences. ffdshow, on the other hand, is always slowest and makes the least use of multi-core CPUs.
Like last year, I’d like to give some recommendations what demos of 2008 are worth watching. As usual, this reflects only my personal opinion. That means if you totally love MFX demos, you won’t like my selection ;)
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This post and the software described in it were originally planned to be released before or on December 24th, but I didn’t manage to finish either. So consider my random wallpaper generator as a late christmas gift.
The idea for this program was born rather quickly: I wanted to have some nice and fancy desktop background images (»wallpapers«), and I wanted them to change every day. This is nothing new, I already did that in the past by writing scripts that choose one random image from a certain directory, scale them to fit on the screen and use them as wallpaper. This approach is simple and common; it’s supported by all major desktop enviroments now, if I remember correctly. However, it has two drawbacks: First, you need to update the pool of available images every now and then so it doesn’t get boring. Second, everyone who’s looking at your desktop (maybe because you do a presentation, or you want to show something, or you requested some help) will be distracted by the wallpaper. You’ll likely end up talking about the things that can be seen on the wallpaper rather than the real subject.
A proper solution for this is having a generator that procedurally creates random images that are suitable as background images – that is, nice, soothing images that don’t distract too much. Basically the kind of background images that shipped as default in Ubuntu up to 7.10 and Mac OS X up to 10.4. My program is trying to do exactly that.
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I want to apologize for the lack of posts here. I know that many people want to know the outcome of the Apple thing and the status of the two jeopardized programs. So, to finally break the much too long period of silence, here’s the current status of the projects:
The presentation program is online again under its new name Impressive: http://impressive.sourceforge.net. Currently, there’s only a rebranded 0.10.2 version, but I hope to move forward with a new version in the first quarter of 2009.
The iPod management tool has been renamed to rePear: http://repear.sourceforge.net/. Along with the rename, the brand-new and much improved version 0.4 has been released.
I find it unfortunate and unnecessary that the issue needed to be settled involving layers and lots of money. It would have been easier for both sides (and certainly more civilized) to simply write an e-mail to state the problem. I am willing to co-operate. You can still call your lawyers if I don’t comply, but I don’t see any reason why there should be money involved from the start.
I know it’s a little bit late, but anyway, here is my small party report from this year’s Evoke. Like every time, the atmosphere and ambience was excellent and we had very much fun at the party, but there were also some disappointing aspect about it.
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