i think the deal with DNxHD and ProRes is they are heavily parallel. from what i've found (which is scant info to say the least), the codecs are extremely similar in philosophy and implementation, though of course apple made a lot more noise about it than Avid did (when they came out with it much earlier).
@ tateu: it'd be interesting to compare the quicktime and ffmpeg implementations of prores, assuming it gets ported eventually. there'll likely be massive gains in quicktime the more cores you have.
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