vf_copy: silence "incompatible pointer type" warning

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_mp: remove unused function

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/af_astats: fix 64bit printf type

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>