Category Archives: General

Time for something new

In the beginning of December, Frederik was born. He’s growing up nicely. At the end of December, I succesfully defended my PhD thesis (see earlier post) and was awarded a PhD for my research titled “Notch signaling in forebrain neurogenesis”. … Continue reading

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Meet Frederik

The latest addition to our little sprouting family: Frederik Jie Bultje. Born December 12th, 2010 in New York.

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The world’s fastest VP8 decoder: FFmpeg

Jason does a great job explaining what we did and how we did it.

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Google’s VP8 video codec

Now that the hype is over, let’s talk the real deal. How good is Google’s VP8 video codec? Since “multiple independent implementations help a standard mature quicker and become more useful to its users”, me and others (David for the … Continue reading

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WMAVoice postfilter

I previously posted about my ongoing studies on the WMA Voice codec. A basic implementation of the actual codec was submitted and accepted/applied into FFmpeg SVN. Speech codecs work at ultra-low bitrates (~10kbps and lower) and suffer from obvious encoding … Continue reading

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Google Summer-of-Code 2010 deadline nearing

I blogged about it before, but let’s remind all students that you can work on FFmpeg this summer, and earn money ($5000) while doing so. The deadline is this Friday, the 9th. Google’s Summer-of-Code is a yearly recurring event where … Continue reading

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Google’s Summer of Code 2010

It’s that time again – the time where Google will announce their Summer of Code! In the summer of code, students can work on free software projects during their summer break, and make $4500 while they’re at it. FFmpeg has … Continue reading

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WMAVoice codec dissection

Since my last post,I’ve completed my first version of a free (as in speech) WMA-Voice/Speech codec. The patch is available on the FFmpeg mailinglist. As described previously, the codec has some very interesting behaviour, e.g. related to integer rounding. At … Continue reading

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Codec woes

I’ve recently become interested in codecs. We all know the brilliant FFmpeg project, which has provided free (as per FSF definition) implementations of a variety of popular codecs, such as Windows Media or MPEG/H.26x. I’ve started to study one member … Continue reading

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My first publications

In daily life, I’m a Ph.D. student studying the development of the central nervous system. A few months ago, the first paper was released with my name on it (as a second author), and just yesterday, I received notification of … Continue reading

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