Answering to my own mail makes me feel I'm mad, but... here is some more info
> 3dnow does not seem to change anything, but there are some comments > saying that adding -DUSE_3DNOW makes cinelerra not compiling. I see > this is only used in libmpeg3, I'm gonna have a look at it. Those options seem to be dead code leftover by hv and are not working. There are a lot of cpu optimizations that could be enabled for ffmpeg, like 3dnow, 3dnowext, mmx, mmxext. Some are enabled, but I don't understand why the ffmpeg configure section is before the cpu checks, so I'm not sure which ones are enabled and which are not. Regards, Alexis.
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