yes, because ffmpeg compiles against the shared library called vdpau to do the hardware acceleration ... so, the dependency IS necessary ...
the driver installed externally also provides it.... the USE variable modifies the configuration of the package, so, if you remove vdpau, you won't compile with vdpau support ... you can use the variable EXTRA_ECONF to pass parameters to ./configure and manually add vdpau, but I don't know if there's an option to modify that on a package basis (like /etc/portage/package.use ) .. instead of a global var ... without touching ebuilds ... ¿ any hint about that? Alex ~
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