add test case

src/ffmpeg/tests/__snapshots__/test_base/test_filter_with_zero.1.json

@@ -0,0 +1,10 @@
+[
+  "ffmpeg",
+  "-i",
+  "input.mp4",
+  "-filter_complex",
+  "[0:a]volume=volume=0.0[s0]",
+  "-map",
+  "[s0]",
+  "output.mp4"
+]

src/ffmpeg/tests/__snapshots__/test_base/test_filter_with_zero.json

@@ -0,0 +1,10 @@
+[
+  "ffmpeg",
+  "-i",
+  "input.mp4",
+  "-filter_complex",
+  "[0:a]volume=volume=0.0[s0]",
+  "-map",
+  "[s0]",
+  "output.mp4"
+]

src/ffmpeg/tests/test_base.py

@@ -192,3 +192,13 @@ def test_customize_vfilter(snapshot: SnapshotAssertion) -> None:
     )
 
     assert snapshot(extension_class=JSONSnapshotExtension) == gltransition.output(filename="output.mp4").compile()
+
+
+def test_filter_with_zero(snapshot: SnapshotAssertion) -> None:
+    stream = input("input.mp4").audio.volume(volume=0.0)
+
+    assert stream.output(filename="output.mp4").compile() == snapshot(extension_class=JSONSnapshotExtension)
+
+    stream = input("input.mp4").audio.volume(volume="0.0")
+
+    assert stream.output(filename="output.mp4").compile() == snapshot(extension_class=JSONSnapshotExtension)