Fixed install-ffmpeg for empty patch

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [windows-latest]
 
     env:
       FFMPEG_VERSION: n5.1.2
@@ -64,12 +64,12 @@ jobs:
       run: |
         choco install make
         choco install yasm
-        echo "FFMPEG_POST_CHECKOUT='&& git apply $(cygpath -u ${{ github.WORKSPACE }})/.github/workflows/windows.patch'" >> $env:GITHUB_ENV
+        echo "FFMPEG_PATCH_PATH='$(cygpath -u ${{ github.WORKSPACE }})/.github/workflows/windows.patch'" >> $env:GITHUB_ENV
 
     - if: ${{ steps.load-ffmpeg-cache.outputs.cache-hit != 'true' }}
       name: Install ffmpeg
       run: |
-        make install-ffmpeg srcPath=${{ env.FFMPEG_PATH }}/src version=${{ env.FFMPEG_VERSION }} postCheckout=${{ env.FFMPEG_POST_CHECKOUT }}
+        make install-ffmpeg srcPath=${{ env.FFMPEG_PATH }}/src version=${{ env.FFMPEG_VERSION }} patchPath=${{ env.FFMPEG_PATCH_PATH }}
 
     - if: ${{ steps.load-ffmpeg-cache.outputs.cache-hit != 'true' }}
       name: Save ffmpeg cache

Makefile

@@ -1,17 +1,20 @@
-version = "n5.1.2"
-srcPath = "tmp/$(version)/src"
-postCheckout = ""
-platform = ""
+version=n5.1.2
+srcPath=tmp/$(version)/src
+patchPath=
+platform=
 
 generate-flags:
 	go run internal/cmd/flags/main.go
 
 install-ffmpeg:
 	rm -rf $(srcPath)
 	mkdir -p $(srcPath)
-	# cd $(srcPath) is necessary for windows build since otherwise git doesn't clone in the proper dir
-	cd $(srcPath) && git clone https://github.com/FFmpeg/FFmpeg $(srcPath)
-	cd $(srcPath) && git checkout $(version) $(postCheckout)
+	git clone https://github.com/FFmpeg/FFmpeg $(srcPath)
+	ls -la $(srcPath)
+	cd $(srcPath) && git checkout $(version)
+ifneq "" "$(patchPath)"
+	cd $(srcPath) && git apply $(patchPath)
+endif
 	cd $(srcPath) && ./configure --prefix=.. $(configure)
 	cd $(srcPath) && make
 	cd $(srcPath) && make install