Trace stalled Linux video encoder

.github/workflows/test.yml

@@ -55,11 +55,22 @@ jobs:
         with:
           python-version: "3.12"
       - name: Install ffmpeg
-        run: sudo apt-get update && sudo apt-get install --yes ffmpeg
+        run: sudo apt-get update && sudo apt-get install --yes ffmpeg strace
       - name: Sync dev environment
         run: uv sync --frozen --extra dev
       - name: Run full-clip video test
-        run: >-
-          uv run pytest -vv
-          -o faulthandler_timeout=60
-          tests/test_video.py::TestVideoVisibleFullClip
+        run: |
+          set +e
+          timeout --kill-after=10s 90s \
+            strace -ff -tt -s 256 -o /tmp/video-e2e.strace \
+            uv run pytest -vv -o faulthandler_timeout=45 \
+            tests/test_video.py::TestVideoVisibleFullClip
+          status=$?
+          if [ "$status" -ne 0 ]; then
+            for trace in /tmp/video-e2e.strace*; do
+              echo "::group::$trace"
+              tail -n 100 "$trace"
+              echo "::endgroup::"
+            done
+          fi
+          exit "$status"