diff --git a/.github/workflows/windows-ncnn.yml b/.github/workflows/windows-ncnn.yml
index 31a425b..d13382d 100644
--- a/.github/workflows/windows-ncnn.yml
+++ b/.github/workflows/windows-ncnn.yml
@@ -207,9 +207,28 @@ jobs:
         grep -i 'error' x265.log && exit 1
         exit 0
 
+    - name: Create script (flexible output)
+      shell: bash
+      run: echo "import vapoursynth as vs;from vapoursynth import core;import sys;print(core.ncnn, core.ncnn.Version(), file=sys.stderr);prop='test';output=core.std.BlankClip(format=vs.RGBS, width=127, height=63).ncnn.Model(r\"waifu2x\\upconv_7_anime_style_art_rgb\\scale2.0x_model.onnx\", builtin=True, flexible_output_prop=prop);core.std.ShufflePlanes([output['clip'].std.PropToClip(prop=f'{prop}{i}') for i in range(output['num_planes'])], [0, 0, 0], vs.RGB).resize.Bicubic(format=vs.YUV420P10, matrix_s='709').set_output()" > test_flexible_output.vpy
+
+    - name: Run vspipe (flexible output)
+      shell: bash
+      run: |
+        set -ex
+        vs_portable/vspipe -i test_flexible_output.vpy -
+        vs_portable/vspipe --y4m -p -e 9 test_flexible_output.vpy - | vs_portable/x265 --log-file x265.log --log-file-level info --y4m -D 10 --preset ultrafast -o out.hevc -
+        ls -l out.hevc x265.log
+        cat x265.log
+        grep -F 'encoded 10 frames' x265.log || exit 2
+        grep -i 'error' x265.log && exit 1
+        exit 0
+
     - name: Describe
       run: git describe --tags --long
 
+    - name: Dump dependencies
+      run: dumpbin /dependents artifact\vsncnn.dll
+
     - name: Compress artifact for release
       if: github.event_name == 'workflow_dispatch' && github.event.inputs.tag != ''
       run: |