Create app.py

app.py

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+import streamlit as st
+import whisper
+from TTS.api import TTS
+from moviepy.editor import VideoFileClip, AudioFileClip, CompositeAudioClip
+import os
+from tempfile import NamedTemporaryFile
+import torchaudio
+
+# Page config
+st.set_page_config(page_title="AI Voiceover Generator V2", layout="centered")
+st.title("🎤 AI Voiceover V2: Replace One Speaker Only")
+
+# Load models
+@st.cache_resource
+def load_whisper_model():
+    return whisper.load_model("small")
+
+@st.cache_resource
+def load_tts_model():
+    return TTS(model_name="tts_models/en/ljspeech/tacotron2-DDC", progress_bar=False, gpu=False)
+
+whisper_model = load_whisper_model()
+tts = load_tts_model()
+
+# Upload video
+video_file = st.file_uploader("Upload a short video clip (MP4 preferred)", type=["mp4", "mov", "avi"])
+
+if video_file:
+    with NamedTemporaryFile(delete=False, suffix=".mp4") as tmp_video:
+        tmp_video.write(video_file.read())
+        tmp_video_path = tmp_video.name
+
+    st.video(tmp_video_path)
+
+    # Extract audio
+    video = VideoFileClip(tmp_video_path)
+    audio_path = tmp_video_path.replace(".mp4", ".wav")
+    video.audio.write_audiofile(audio_path)
+
+    # Transcribe
+    st.info("Transcribing using Whisper...")
+    result = whisper_model.transcribe(audio_path)
+    st.subheader("📝 Detected Speech")
+    st.write(result["text"])
+
+    # Custom voiceover input
+    custom_text = st.text_area("Enter your custom voiceover text to replace one speaker:", result["text"])
+
+    if st.button("Replace Only One Speaker's Voice"):
+        # Generate new voiceover from custom text
+        ai_voice_path = audio_path.replace(".wav", "_ai_voice.wav")
+        tts.tts_to_file(text=custom_text, file_path=ai_voice_path)
+        st.audio(ai_voice_path)
+
+        # Load original audio
+        original_audio, sr = torchaudio.load(audio_path)
+        ai_audio, _ = torchaudio.load(ai_voice_path)
+
+        # Trim or pad AI voice to match duration (for demo purposes)
+        if ai_audio.shape[1] < original_audio.shape[1]:
+            diff = original_audio.shape[1] - ai_audio.shape[1]
+            ai_audio = torchaudio.functional.pad(ai_audio, (0, diff))
+        else:
+            ai_audio = ai_audio[:, :original_audio.shape[1]]
+
+        # Mix original and AI audio (simulating voice replacement, basic blend)
+        # NOTE: This does NOT perform speaker diarization — it's a placeholder
+        mixed_audio = (original_audio * 0.4) + (ai_audio * 0.6)
+        mixed_path = audio_path.replace(".wav", "_mixed.wav")
+        torchaudio.save(mixed_path, mixed_audio, sr)
+
+        # Final video
+        final_video = video.set_audio(AudioFileClip(mixed_path))
+        final_path = tmp_video_path.replace(".mp4", "_final_v2.mp4")
+        final_video.write_videofile(final_path, codec="libx264", audio_codec="aac")
+
+        with open(final_path, "rb") as f:
+            st.download_button(label="📥 Download Final Video with Mixed Voiceover", data=f, file_name="final_ai_video_v2.mp4")