TEMP: diagnose imageio-ffmpeg on Blacksmith windows (to be dropped)

Author: lstein

.github/workflows/python-tests.yml

@@ -158,6 +158,24 @@ jobs:
           uv run --no-sync python -c "import cv2, mediapipe; print(cv2.__version__, mediapipe.__version__)"
           if ($LASTEXITCODE -ne 0) { throw 'cv2 or mediapipe still fails to import after preparing the runner' }
 
+      # TEMPORARY: diagnose why the bundled imageio-ffmpeg binary is rejected on Blacksmith Windows.
+      - name: diagnose ffmpeg (temporary)
+        if: ${{ runner.os == 'Windows' && (steps.changed-files.outputs.python_any_changed == 'true' || inputs.always_run == true) }}
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          $dlls = 'ADVAPI32','AVICAP32','CRYPT32','GDI32','IMM32','IPHLPAPI','KERNEL32','OLEAUT32','SETUPAPI','SHELL32','SHLWAPI','USER32','VERSION','WINMM','WS2_32','bcrypt','msvcrt','ncrypt','ole32','MSVFW32'
+          foreach ($name in $dlls) {
+            if (Test-Path "$env:windir\System32\$name.dll") { Write-Output "$name.dll present" } else { Write-Output "$name.dll MISSING" }
+          }
+          $exe = Get-ChildItem .venv\Lib\site-packages\imageio_ffmpeg\binaries\*.exe | Select-Object -First 1
+          Write-Output "ffmpeg exe: $($exe.FullName)"
+          try { & $exe.FullName -version } catch { Write-Output "ffmpeg invocation threw: $_" }
+          Write-Output "ffmpeg exit code: $LASTEXITCODE"
+          Write-Output ('ffmpeg exit code (hex): 0x{0:X8}' -f $LASTEXITCODE)
+          uv run --no-sync python -c "import imageio_ffmpeg; print(imageio_ffmpeg.get_ffmpeg_exe())"
+          Write-Output "get_ffmpeg_exe exit code: $LASTEXITCODE"
+
       - name: run pytest
         if: ${{ steps.changed-files.outputs.python_any_changed == 'true' || inputs.always_run == true }}
         # `logical`, not `auto`: xdist's `auto` asks psutil for *physical* cores, which is half