Do not mix conda-forge, defaults and nvidia conda channels in linux_cuda_wheel job

.github/workflows/linux_cuda_wheel.yaml

@@ -70,8 +70,7 @@ jobs:
         # We test against 12.6 and 13.0 to avoid having too big of a CI matrix,
         # but for releases we should add 12.8.
         cuda-version: ['12.6', '13.0']
-        # TODO: put back ffmpeg 5 https://github.com/pytorch/torchcodec/issues/325
-        ffmpeg-version-for-tests: ['4.4.2', '6', '7', '8.0']
+        ffmpeg-version-for-tests: ['4.4.2', '5', '6', '7', '8.0']
 
     container:
       image: "pytorch/manylinux2_28-builder:cuda${{ matrix.cuda-version }}"
@@ -89,40 +88,46 @@ jobs:
           name: meta-pytorch_torchcodec__${{ matrix.python-version }}_cu${{ env.cuda_version_without_periods }}_x86_64
           path: pytorch/torchcodec/dist/
       - name: Setup miniconda using test-infra
-        uses: pytorch/test-infra/.github/actions/setup-miniconda@main
+        uses: conda-incubator/setup-miniconda@v3
         with:
+          # Using miniforge instead of miniconda ensures that the default
+          # conda channel is conda-forge instead of main/default. This ensures
+          # ABI consistency between dependencies:
+          # https://conda-forge.org/docs/user/transitioning_from_defaults/
+          miniforge-version: latest
           python-version: ${{ matrix.python-version }}
-          # We install conda packages at the start because otherwise conda may have conflicts with dependencies.
+      - name: Install dependencies
+        run: |
           # Note: xorg-libxau was addded to fix a problem with ffmpeg 4. We should consider removing it.
-          default-packages: "nvidia/label/cuda-${{ matrix.cuda-version }}.0::libnpp nvidia::cuda-nvrtc=${{ matrix.cuda-version }} nvidia::cuda-toolkit=${{ matrix.cuda-version }} nvidia::cuda-cudart=${{ matrix.cuda-version }} nvidia::cuda-driver-dev=${{ matrix.cuda-version }} conda-forge::ffmpeg=${{ matrix.ffmpeg-version-for-tests }} conda-forge::xorg-libxau"
+          conda install libnpp cuda-nvrtc=${{ matrix.cuda-version }} cuda-toolkit=${{ matrix.cuda-version }} cuda-cudart=${{ matrix.cuda-version }} cuda-driver-dev=${{ matrix.cuda-version }} ffmpeg=${{ matrix.ffmpeg-version-for-tests }} xorg-libxau
       - name: Check env
         run: |
-          ${CONDA_RUN} env
-          ${CONDA_RUN} conda info
-          ${CONDA_RUN} nvidia-smi
-          ${CONDA_RUN} conda list
+          env
+          conda info
+          nvidia-smi
+          conda list
       - name: Assert ffmpeg exists
         run: |
-          ${CONDA_RUN} ffmpeg -buildconf
+           ffmpeg -buildconf
       - name: Update pip
         run: ${CONDA_RUN} python -m pip install --upgrade pip
       - name: Install PyTorch
         run: |
-          ${CONDA_RUN} python -m pip install --pre torch torchvision --index-url https://download.pytorch.org/whl/nightly/cu${{ env.cuda_version_without_periods }}
-          ${CONDA_RUN} python -c 'import torch; print(f"{torch.__version__}"); print(f"{torch.__file__}"); print(f"{torch.cuda.is_available()=}")'
+          conda run python -m pip install --pre torch torchvision --index-url https://download.pytorch.org/whl/nightly/cu${{ env.cuda_version_without_periods }}
+          conda run python -c 'import torch; print(f"{torch.__version__}"); print(f"{torch.__file__}"); print(f"{torch.cuda.is_available()=}")'
       - name: Install torchcodec from the wheel
         run: |
           wheel_path=`find pytorch/torchcodec/dist -type f -name "*cu${{ env.cuda_version_without_periods }}-cp${{ env.python_version_without_periods }}*.whl"`
           echo Installing $wheel_path
-          ${CONDA_RUN} python -m pip install $wheel_path -vvv
+          python -m pip install $wheel_path -vvv
 
       - name: Check out repo
         uses: actions/checkout@v3
 
       - name: Install test dependencies
         run: |
           # Ideally we would find a way to get those dependencies from pyproject.toml
-          ${CONDA_RUN} python -m pip install numpy pytest pillow
+          python -m pip install numpy pytest pillow
 
       - name: Delete the src/ folder just for fun
         run: |
@@ -140,7 +145,7 @@ jobs:
           ls
       - name: Run Python tests
         run: |
-          ${CONDA_RUN} FAIL_WITHOUT_CUDA=1 pytest --override-ini="addopts=-v" test --tb=short
+          FAIL_WITHOUT_CUDA=1 pytest --override-ini="addopts=-v" test --tb=short
       - name: Run Python benchmark
         run: |
-          ${CONDA_RUN} time python benchmarks/decoders/gpu_benchmark.py --devices=cuda:0,cpu --resize_devices=none
+          time python benchmarks/decoders/gpu_benchmark.py --devices=cuda:0,cpu --resize_devices=none