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Originally Posted by GodofaGap
Are these 2 fourcc's for VC1 (WMV3 for SP/MP and WMVA for AP IIUC) private to Microsoft, or can we expect future implementations of VC1 by other companies to use these fourcc's as well? (Or perhaps both?)
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My guess is that 3rd party encoder implementations will want to use the same FourCCs if they're not planning on providing their own decoder implementation. That way they can leverage Microsoft's decoders. However, if they want to force people to use their decoder implementations too, they might use a different 4cc code to avoid filter conflict.
It's difficult to regulate these things. Remember how Canopus had a different 4cc for their DV video, even though it was perfectly compliant with every other DV decoder on the market? We'll see how things turn out for VC-1. Hopefully it won't be a FourCC mess.
