diff --git a/libs/libx264/Makefile b/libs/libx264/Makefile
index ff28cd84d..4bbab5f95 100644
--- a/libs/libx264/Makefile
+++ b/libs/libx264/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=x264
 PKG_VERSION:=snapshot-20180401-2245
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://download.videolan.org/x264/snapshots/
@@ -38,9 +38,9 @@ ifneq ($(CONFIG_SOFT_FLOAT)$(findstring $(call qstrip,$(CONFIG_CPU_TYPE)),$(CPU_
   CONFIGURE_ARGS += --disable-asm
 else
 ifneq ($(CONFIG_TARGET_x86),)
-ifeq ($(CONFIG_YASM),y)
-  CONFIGURE_VARS+= AS=yasm
-  MAKE_FLAGS+= AS=yasm
+ifeq ($(CONFIG_NASM),y)
+  CONFIGURE_VARS+= AS=nasm
+  MAKE_FLAGS+= AS=nasm
 else
   CONFIGURE_VARS+= AS= 
   MAKE_FLAGS+= AS= 
diff --git a/multimedia/ffmpeg/Makefile b/multimedia/ffmpeg/Makefile
index 2f862d094..4f29945fc 100644
--- a/multimedia/ffmpeg/Makefile
+++ b/multimedia/ffmpeg/Makefile
@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ffmpeg
 PKG_VERSION:=3.2.10
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://ffmpeg.org/releases/
@@ -442,9 +442,12 @@ ifeq ($(ARCH),x86_64)
 	FFMPEG_CONFIGURE+= --enable-lto
 endif
 
-ifneq ($(CONFIG_YASM),y)
-FFMPEG_CONFIGURE+= --disable-yasm
-
+ifneq ($(CONFIG_TARGET_x86),)
+ifeq ($(CONFIG_NASM),y)
+  FFMPEG_CONFIGURE += --yasmexe=nasm
+else
+  FFMPEG_CONFIGURE += --disable-yasm
+endif
 endif
 
 ifeq ($(BUILD_VARIANT),full)
@@ -477,7 +480,7 @@ ifeq ($(BUILD_VARIANT),full)
 	FFMPEG_CONFIGURE+= $(if $(CONFIG_PACKAGE_lame-lib),--enable-libmp3lame)
 	# x264 support and fdk-aac support can't coexist and be distributed.
 	# Prioritize x264 over fdk-aac in default builds (maintain status-quo).
-	ifeq ($(CONFIG_PACKAGE_libx264),y)
+	ifneq ($(CONFIG_PACKAGE_libx264),)
 		FFMPEG_CONFIGURE+= \
 			--enable-gpl \
 			--enable-libx264
@@ -555,7 +558,7 @@ ifeq ($(CONFIG_FFMPEG_CUSTOM_SELECT_libshine),y)
 	--enable-libshine --enable-encoder=libshine
 endif
 
-ifeq ($(CONFIG_FFMPEG_CUSTOM_SELECT_libx264),y)
+ifneq ($(CONFIG_FFMPEG_CUSTOM_SELECT_libx264),)
   FFMPEG_CONFIGURE+= \
 	--enable-libx264 --enable-encoder=libx264
 endif
@@ -640,7 +643,7 @@ define Build/InstallDev/full
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lib{avcodec,avdevice,avfilter,avformat,avresample,avutil,swresample,swscale} $(1)/usr/include/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/lib{avcodec,avdevice,avfilter,avformat,avresample,avutil,swresample,swscale}.{a,so*} $(1)/usr/lib/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/lib{avcodec,avdevice,avfilter,avformat,avresample,avutil,swresample,swscale}.pc $(1)/usr/lib/pkgconfig/
-ifeq ($(CONFIG_PACKAGE_libx264),y)
+ifneq ($(CONFIG_PACKAGE_libx264),)
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/libpostproc $(1)/usr/include/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libpostproc.{a,so*} $(1)/usr/lib/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/libpostproc.pc $(1)/usr/lib/pkgconfig/
@@ -706,7 +709,7 @@ endef
 define Package/libffmpeg-full/install
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/lib{avcodec,avdevice,avfilter,avformat,avresample,avutil,swresample,swscale}.so.* $(1)/usr/lib/
-ifeq ($(CONFIG_PACKAGE_libx264),y)
+ifneq ($(CONFIG_PACKAGE_libx264),)
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libpostproc.so.* $(1)/usr/lib/
 endif
 endef