using .mkv and add opencv-python to pip

app.py

@@ -18,7 +18,7 @@ def text_to_video(
 
 def predict(text: str, text_language: str, sign_language: str):
     try:
-        path = "./output.mp4"
+        path = "./output.mkv"
         text_to_video(text, text_language, sign_language, output_path=path)
         return path
     except Exception as exc:
@@ -45,7 +45,7 @@ gradio_app = gradio.Interface(
         ),
     ],  # type: ignore
     outputs=gradio.Video(
-        format="mp4",
+        format="mkv",
         label="Synthesized Sign Language Video",
         autoplay=True,
         show_download_button=True,

requirements.txt

@@ -1 +1,2 @@
 sign-language-translator
+opencv-python