Update app.py

app.py

@@ -163,7 +163,7 @@ def step3_encode(
 def build_ui():
     with gr.Blocks(theme=gr.themes.Soft()) as demo:
         gr.HTML(render_logo_html(88))
-        gr.Markdown("Re-encode a folder/ZIP of frames into a video. Optionally mux audio from a video/audio file.")
+        gr.Markdown("Re-encode a folder/ZIP of frames into a video. Optionally mix audio from a video/audio file.")
 
         uploaded_frames = gr.Files(label="Upload frames (ZIP or images)", type="filepath")
         uploaded_audio = gr.File(label="Optional: video/audio for audio track", file_types=[".mp4",".mov",".mkv",".webm",".mp3",".wav"], type="filepath")