diff --git a/.github/workflows/smoke.yml b/.github/workflows/smoke.yml
index f5e0c07e6..ddf61b7e2 100644
--- a/.github/workflows/smoke.yml
+++ b/.github/workflows/smoke.yml
@@ -20,34 +20,70 @@ on:
       - '.github/workflows/lint.yml'
       - '.github/workflows/tests.yml'
 jobs:
+  matrix:
+    name: Pick Python versions
+    runs-on: ubuntu-24.04
+    outputs:
+      config: ${{ steps.pick.outputs.config }}
+    steps:
+    - name: Pick
+      id: pick
+      shell: python
+      run: |
+        import json, os, random
+
+        configs = [
+            {"os": "ubuntu-24.04", "ffmpeg": "9.0.2", "extras": True},
+            {"os": "ubuntu-24.04", "ffmpeg": "8.1.3"},
+            {"os": "ubuntu-24.04", "ffmpeg": "9.0.2"},
+            # riscv64 wheels (e.g. Pillow) are often missing on PyPI; RISE
+            # mirrors prebuilt wheels for it so uv doesn't have to build them
+            # from source. It also uses a pyav-ffmpeg prebuilt to speed up
+            # smoke tests. Neither index has cp315 riscv64 wheels yet.
+            {
+                "os": "ubuntu-24.04-riscv",
+                "ffmpeg": "9.0.2",
+                "prebuilt": True,
+                "uv-index": "https://pypi.riseproject.dev/simple/",
+                "pythons": ["3.12", "3.13", "3.14"],
+            },
+            {"os": "macos-15", "ffmpeg": "8.1.3"},
+            {"os": "macos-15", "ffmpeg": "9.0.2"},
+        ]
+        pythons = ["3.12", "3.13", "3.14", "3.15"]
+        # Don't give two jobs with the same OS and FFmpeg the same Python.
+        taken = set()
+        for config in configs:
+            key = (config["os"], config["ffmpeg"])
+            choices = [
+                py for py in config.pop("pythons", pythons) if (key, py) not in taken
+            ]
+            config["python"] = random.choice(choices)
+            taken.add((key, config["python"]))
+
+        with open(os.environ["GITHUB_OUTPUT"], "a") as f:
+            f.write(f"config={json.dumps(configs)}\n")
+
   nix:
-    name: "py-${{ matrix.config.python }} lib-${{ matrix.config.ffmpeg }} ${{matrix.config.os}}"
+    name: "py${{ matrix.config.python }} lib-${{ matrix.config.ffmpeg }} ${{ matrix.config.os }}"
+    needs: matrix
     runs-on: ${{ matrix.config.os }}
     strategy:
       fail-fast: false
       matrix:
-        config:
-          - {os: ubuntu-24.04, python: "3.14", ffmpeg: "9.0.2", extras: true}
-          - {os: ubuntu-24.04, python: "3.12", ffmpeg: "8.1.2"}
-          - {os: ubuntu-24.04, python: "3.13", ffmpeg: "9.0.2"}
-          - {os: ubuntu-24.04-riscv, python: "3.14", ffmpeg: "9.0.2"}
-          - {os: macos-15, python: "3.12", ffmpeg: "8.1.2"}
-          - {os: macos-15, python: "3.14", ffmpeg: "9.0.2"}
+        config: ${{ fromJSON(needs.matrix.outputs.config) }}
 
     env:
       PYAV_PYTHON: python${{ matrix.config.python }}
       PYAV_LIBRARY: ffmpeg-${{ matrix.config.ffmpeg }}
-      # riscv64 wheels (e.g. Pillow) are often missing on PyPI; RISE mirrors
-      # prebuilt wheels for it so uv doesn't have to build them from source.
       # unsafe-best-match is needed so uv still falls back to PyPI for
-      # packages/versions RISE doesn't happen to carry.
-      UV_INDEX: ${{ matrix.config.os == 'ubuntu-24.04-riscv' && 'https://pypi.riseproject.dev/simple/' || '' }}
-      UV_INDEX_STRATEGY: ${{ matrix.config.os == 'ubuntu-24.04-riscv' && 'unsafe-best-match' || 'first-index' }}
-      # riscv64 uses a pyav-ffmpeg prebuilt to speed up smoke tests; its .pc
-      # files bake in prefix=/tmp/vendor, so it must be extracted there
-      # verbatim and pointed at explicitly.
-      PKG_CONFIG_PATH: ${{ matrix.config.os == 'ubuntu-24.04-riscv' && '/tmp/vendor/lib/pkgconfig' || '' }}
-      LD_LIBRARY_PATH: ${{ matrix.config.os == 'ubuntu-24.04-riscv' && '/tmp/vendor/lib' || '' }}
+      # packages/versions an extra index doesn't happen to carry.
+      UV_INDEX: ${{ matrix.config.uv-index || '' }}
+      UV_INDEX_STRATEGY: ${{ matrix.config.uv-index && 'unsafe-best-match' || 'first-index' }}
+      # pyav-ffmpeg prebuilt .pc files bake in prefix=/tmp/vendor, so it must
+      # be extracted there verbatim and pointed at explicitly.
+      PKG_CONFIG_PATH: ${{ matrix.config.prebuilt && '/tmp/vendor/lib/pkgconfig' || '' }}
+      LD_LIBRARY_PATH: ${{ matrix.config.prebuilt && '/tmp/vendor/lib' || '' }}
 
     steps:
     - uses: actions/checkout@v7
@@ -61,35 +97,22 @@ jobs:
 
     - name: OS Packages
       run: |
-        case ${{ matrix.config.os }} in
-          ubuntu-24.04)
-            sudo apt-get update
-            sudo apt-get install -y \
-              autoconf \
-              automake \
-              build-essential \
-              cmake \
-              libtool \
-              libx264-dev \
-              nasm \
-              pkg-config \
-              zlib1g-dev
+        case ${{ runner.os }} in
+          Linux)
+            packages="build-essential pkg-config zlib1g-dev"
+            if [[ "${{ matrix.config.prebuilt }}" ]]; then
+              # libxcb-shape0 is needed for the prebuilt's X11 usage.
+              packages="$packages libxcb-shape0"
+            else
+              packages="$packages autoconf automake cmake libtool libx264-dev nasm"
+            fi
             if [[ "${{ matrix.config.extras }}" ]]; then
-              sudo apt-get install -y doxygen
+              packages="$packages doxygen"
             fi
-            ;;
-          ubuntu-24.04-riscv)
-          # Since we're using pyav-ffmpeg prebuilds, we don't need the full set
-          # of packages installed on other runners. libxcb-shape0 is needed
-          # for the prebuilt's X11 usage.
             sudo apt-get update
-            sudo apt-get install -y \
-              build-essential \
-              pkg-config \
-              zlib1g-dev \
-              libxcb-shape0
+            sudo apt-get install -y $packages
             ;;
-          macos-15)
+          macOS)
             brew install automake libtool opus x264
             ;;
         esac
@@ -97,8 +120,7 @@ jobs:
     - name: Pip and FFmpeg
       run: |
         . scripts/activate.sh ffmpeg-${{ matrix.config.ffmpeg }}
-        # don't build from source for riscv64
-        if [ "${{ matrix.config.os }}" = "ubuntu-24.04-riscv" ]; then
+        if [[ "${{ matrix.config.prebuilt }}" ]]; then
             python scripts/fetch-vendor.py --config-file scripts/ffmpeg-latest.json /tmp/vendor
         else
             scripts/build-deps
diff --git a/Makefile b/Makefile
index da372a93b..d20b1c902 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ fate-suite:
 	rsync -vrltLW rsync://fate-suite.ffmpeg.org/fate-suite/ tests/assets/fate-suite/
 
 lint:
-	$(PIP) install --only-binary pillow --group lint
+	$(PIP) install --only-binary numpy,pillow --group lint
 	ruff format --check av examples tests setup.py
 	isort --check-only --diff av examples tests
 	mypy av tests
@@ -40,5 +40,5 @@ pxdpad: pxdpad-build
 	tools/pxdpad/bin/pxdpad av include
 
 test:
-	$(PIP) install --only-binary pillow --group test
+	$(PIP) install --only-binary numpy,pillow --group test
 	$(PYTHON) -m pytest
diff --git a/tests/test_doctests.py b/tests/test_doctests.py
index 736d27c62..c336b8b64 100644
--- a/tests/test_doctests.py
+++ b/tests/test_doctests.py
@@ -2,6 +2,7 @@
 import pkgutil
 import re
 import types
+import unittest
 from unittest import TestCase
 
 import av
@@ -32,7 +33,14 @@ def register_doctests(mod: str | types.ModuleType) -> None:
         assert isinstance(test, doctest.DocTestCase)
 
         def func(self: TestCase, test: doctest.DocTestCase = test) -> None:
-            return test.runTest()
+            # Go through run(); since Python 3.15, runTest() reports to the
+            # result that only run() sets.
+            result = unittest.TestResult()
+            test.run(result)
+            if problems := result.errors + result.failures:
+                self.fail("\n".join(tb for _, tb in problems))
+            if any(t is test for t, _ in result.skipped):
+                self.skipTest("all examples were skipped")
 
         name = str("test_" + re.sub("[^a-zA-Z0-9]+", "_", test.id()).strip("_"))
         func.__name__ = name