Add MP4 upload support

tests/test_web_app.py

@@ -39,6 +39,20 @@ def test_build_pipeline_command_accepts_optional_settings():
     assert "--gpu" in command
 
 
+def test_build_pipeline_command_accepts_uploaded_mp4():
+    command = build_pipeline_command(
+        {
+            "input_file": "C:\\videos\\demo.mp4",
+            "lang": "de",
+        }
+    )
+
+    assert "https://youtube.com/watch?v=demo" not in command
+    assert "--input-file" in command
+    assert command[command.index("--input-file") + 1] == "C:\\videos\\demo.mp4"
+    assert command[command.index("--lang") + 1] == "de"
+
+
 def test_create_app_builds_gradio_blocks():
     app = create_app()