Cannot build ffmpeg wasm with libaom using docker

[rathesh77]

I would like to transcode av1 encoded video into mp4 and so I have been trying to build ffmpeg wasm with docker by adding these lines inside the dockerfile. The point here is to include libaom.

# Build libaom
FROM emsdk-base AS libaom-builder
ENV LIBAOM_BRANCH=master
ADD https://github.com/ffmpegwasm/aom.git#$LIBAOM_BRANCH /src
COPY build/aom.sh /src/build.sh
RUN bash -x /src/build.sh

COPY --from=libaom-builder $INSTALL_DIR $INSTALL_DIR

# Build ffmpeg
FROM ffmpeg-base AS ffmpeg-builder
COPY build/ffmpeg.sh /src/build.sh
RUN bash -x /src/build.sh \
      --enable-gpl \
      --enable-libx264 \
      --enable-libx265 \
      --enable-libvpx \
      --enable-libmp3lame \
      --enable-libtheora \
      --enable-libvorbis \
      --enable-libopus \
      --enable-zlib \
      --enable-libwebp \
      --enable-libfreetype \
      --enable-libfribidi \
      --enable-libass \
      --enable-libzimg \ 
      --enable-libaom \
      --enable-decoder=av1

but then the following errors show up when i run docker buildx build -o . .

43.87 -- Configuring incomplete, errors occurred!
43.87 See also "/src/cmbuild/CMakeFiles/CMakeOutput.log".
43.87 See also "/src/cmbuild/CMakeFiles/CMakeError.log".
43.87 emmake: error: 'cmake .. "-DAOM_EXTRA_C_FLAGS=-I/opt/include  " "-DAOM_EXTRA_CXX_FLAGS=-I/opt/include  " -DCMAKE_INSTALL_PREFIX=/opt -DCMAKE_TOOLCHAIN_FILE=/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DBUILD_SHARED_LIBS=0 -DAOM_TARGET_CPU=generic -DENABLE_DOCS=0 -DENABLE_TESTS=0 -DENABLE_EXAMPLES=0 -DENABLE_TOOLS=0 -DCONFIG_RUNTIME_CPU_DETECT=0 -DCONFIG_WEBM_IO=0' failed (returned 1)
------

 5 warnings found (use docker --debug to expand):
 - UndefinedVar: Usage of undefined variable '$LDFLAGS' (did you mean $CFLAGS?) (line 14)
 - UndefinedVar: Usage of undefined variable '$EM_PKG_CONFIG_PATH' (line 15)
 - UndefinedVar: Usage of undefined variable '$PKG_CONFIG_PATH' (line 17)
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 185)
 - UndefinedVar: Usage of undefined variable '$CFLAGS' (line 12)
Dockerfile:28
--------------------
  26 |     ADD https://github.com/ffmpegwasm/aom.git#$LIBAOM_BRANCH /src
  27 |     COPY build/aom.sh /src/build.sh
  28 | >>> RUN bash -x /src/build.sh
  29 |
  30 |     # Build x264
--------------------

Maybe i am using the wrong git repo for aom ?