The configure process of media-video/ffmpeg reports: Unknown CPU "athlon64-sse3", because -march is set to that value on this machine. The logic in the ebuild should replace athlon64-sse3 (and possibly also k8-sse3 and opteron-sse3) with just athlon64 (k8, opteron), so that ffmpeg's configure properly detects the correct CPU. Reproducible: Always
same goes for -march "native" --> Unknown CPU "native"
(In reply to comment #1) > same goes for -march "native" > --> Unknown CPU "native" > With ffmpeg-0.5_p20373 and -march=native works here fine With "k8-sse3" "opteron-sse3" works not correct >>> Configuring source in /var/tmp/portage/media-video/ffmpeg-0.5_p20373/work/ffmpeg-0.5_p20373 ... true WARNING: Unknown CPU "k8-sse3", ignored.
Fixed in 0.5_p20601-r1 and 9999-r1, thanks for reporting.
In ffmpeg-0.5_p22846 and newer configure have: *-sse3) echo -xarch=sse3 ;; and works fine with -march=k8-sse3 And: ... C compiler x86_64-pc-linux-gnu-gcc ARCH x86 (k8-sse3) big-endian no runtime cpu detection no ...