Add HLS segment download fallback

test_app.py

@@ -4275,6 +4275,36 @@ mid/index.m3u8
             "https://cdn.example/show/high/index.m3u8",
         )
 
+    def test_parse_hls_segments_resolves_plain_and_encrypted_segments(self):
+        playlist = """#EXTM3U
+#EXT-X-MEDIA-SEQUENCE:7
+#EXTINF:4.0,
+seg-1
+#EXT-X-KEY:METHOD=AES-128,URI="keys/key.bin"
+#EXTINF:4.0,
+https://cdn.example/raw-segment
+#EXTINF:4.0,
+seg-3.ts
+"""
+
+        segments = provider_downloader.parse_hls_segments("https://cdn.example/path/index.m3u8", playlist)
+
+        self.assertEqual(segments[0], {"url": "https://cdn.example/path/seg-1"})
+        self.assertEqual(
+            segments[1],
+            {
+                "url": "https://cdn.example/raw-segment",
+                "key_url": "https://cdn.example/path/keys/key.bin",
+                "iv": "8",
+            },
+        )
+        self.assertEqual(segments[2]["iv"], "9")
+
+    def test_strip_png_header_removes_short_wrapper(self):
+        payload = b"\x89PNG\r\n\x1a\njunkIENDabcdVIDEO"
+
+        self.assertEqual(provider_downloader.strip_png_header(payload), b"VIDEO")
+
 
 if __name__ == "__main__":
     unittest.main()