Set Python3 root.

Author: scotts

.github/workflows/macos_wheel.yaml

@@ -73,12 +73,22 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Update pip
-        run: python3 -m pip install --upgrade pip
+        run: |
+          export PATH=${CONDA_ENV}/bin:${CONDA_ENV}:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH
+          export Python3_ROOT_DIR=${CONDA_ENV}
+
+          python3 -m pip install --upgrade pip
       - name: Install PyTorch
         run: |
+          export PATH=${CONDA_ENV}/bin:${CONDA_ENV}:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH
+          export Python3_ROOT_DIR=${CONDA_ENV}
+
           python3 -m pip install --pre torch --index-url https://download.pytorch.org/whl/nightly/cpu
       - name: Install torchcodec from the wheel
         run: |
+          export PATH=${CONDA_ENV}/bin:${CONDA_ENV}:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH
+          export Python3_ROOT_DIR=${CONDA_ENV}
+
           wheel_path=`find pytorch/torchcodec/dist -type f -name "*.whl"`
           echo Installing $wheel_path
           python3 -m pip install $wheel_path -vvv
@@ -92,13 +102,18 @@ jobs:
           # want to checkout the repo before installing the wheel to avoid any
           # side-effect. It's OK.
           source packaging/helpers.sh
-          assert_ffmpeg_not_installed
+
+          # below was failing, but when I just try to call "ffmpeg -version" that also fails?
+          #assert_ffmpeg_not_installed
 
           conda install "ffmpeg=${{ matrix.ffmpeg-version-for-tests }}" -c conda-forge
           ffmpeg -version
 
       - name: Install test dependencies
         run: |
+          export PATH=${CONDA_ENV}/bin:${CONDA_ENV}:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH
+          export Python3_ROOT_DIR=${CONDA_ENV}
+
           python3 -m pip install --pre torchvision --index-url https://download.pytorch.org/whl/nightly/cpu
           # Ideally we would find a way to get those dependencies from pyproject.toml
           python3 -m pip install numpy pytest pillow
@@ -119,7 +134,13 @@ jobs:
           ls
       - name: Smoke test
         run: |
+          export PATH=${CONDA_ENV}/bin:${CONDA_ENV}:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH
+          export Python3_ROOT_DIR=${CONDA_ENV}
+
           python3 test/decoders/manual_smoke_test.py
       - name: Run Python tests
         run: |
+          export PATH=${CONDA_ENV}/bin:${CONDA_ENV}:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH
+          export Python3_ROOT_DIR=${CONDA_ENV}
+
           pytest test