Fix sign of some H264 params
Fix sign of some H264 params

gbeauchesne/libva,chenxianqin/vaapi-libva,01org/iotg-lin-gfx-libva,pma1/libva,android-ia/hardware_intel_libva,chenxianqin/vaapi-libva,android-ia/hardware_intel_libva,CyanogenMod/android_hardware_intel_libva,pma1/libva,01org/libva-cros,CyanogenMod/android_hardware_intel_libva,Distrotech/libva,zzhhui/libva,01org/iotg-lin-gfx-libva,halleyzhao/libva-fdo,halleyzhao/libva-fdo,zzhhui/libva,android-ia/hardware_intel_libva,01org/iotg-lin-gfx-libva,01org/libva-cros,Distrotech/libva,gbeauchesne/libva,pma1/libva,Distrotech/libva,gbeauchesne/libva,halleyzhao/libva-fdo,zzhhui/libva,chenxianqin/vaapi-libva,01org/libva-cros,CyanogenMod/android_hardware_intel_libva