MacOs fixes

.github/workflows/build.yml

@@ -37,7 +37,7 @@ jobs:
 
   build-macos:
     name: build in native macOS
-    runs-on: macos-latest
+    runs-on: macos-14
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

build-ffmpeg

@@ -470,14 +470,30 @@ fi
 if command_exists "python3"; then
   # dav1d needs meson and ninja along with nasm to be built
   if command_exists "pip3"; then
-    # meson and ninja can be installed via pip3
-    execute pip3 install pip setuptools --quiet --upgrade --no-cache-dir --disable-pip-version-check
-    for r in meson ninja; do
-      if ! command_exists ${r}; then
-        execute pip3 install ${r} --quiet --upgrade --no-cache-dir --disable-pip-version-check
+
+  #set variable meson and ninja installed to false
+  MESON_INSTALLED=false
+
+    #check if macOs and brew is available
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+      if ! command_exists "brew"; then
+        brew install python-setuptools meson ninja
+          MESON_INSTALLED=true
       fi
-      export PATH=$PATH:~/Library/Python/3.9/bin
-    done
+    fi
+
+    #check if meson and ninja are installed MESON_INSTALLED
+    if ! $MESON_INSTALLED; then
+      # meson and ninja can be installed via pip3
+      execute pip3 install pip setuptools --quiet --upgrade --no-cache-dir --disable-pip-version-check
+      for r in meson ninja; do
+        if ! command_exists ${r}; then
+          execute pip3 install ${r} --quiet --upgrade --no-cache-dir --disable-pip-version-check
+        fi
+        export PATH=$PATH:~/Library/Python/3.9/bin
+      done
+    fi
+
   fi
   if command_exists "meson"; then
     if build "dav1d" "1.4.2"; then