Fix compilation on ppc64 and ppc with pic if gas-preprocessor is installed.
avformat/smoothstreamingenc: Use av_mallocz_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc: Fix 4K sample video

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