Create app.py

app.py

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+import gradio as gr
+import subprocess
+import static_ffmpeg
+import os
+import tempfile
+
+# Add static ffmpeg to PATH
+static_ffmpeg.add_paths()
+
+def stitch_media(video_file, audio_file, subtitle_file, crf_quality=23):
+ """
+ Stitch video, audio, and subtitle files together using ffmpeg
+ 
+ Args:
+     video_file: Path to video file (.mp4)
+     audio_file: Path to audio file (.wav)
+     subtitle_file: Path to subtitle file (.srt)
+     crf_quality: Video quality (0-51, lower is better, default: 23)
+ 
+ Returns:
+     Path to the output video file and status message
+ """
+ try:
+     # Validate inputs
+     if not video_file or not audio_file or not subtitle_file:
+         return None, "❌ Please upload all three files (video, audio, subtitle)"
+     
+     # Create temporary output file
+     output_dir = tempfile.gettempdir()
+     output_path = os.path.join(output_dir, f"stitched_video_{os.getpid()}.mp4")
+     
+     # Build ffmpeg command
+     # ffmpeg -i video.mp4 -i audio.wav -vf "subtitles=audio.srt" -map 0:v -map 1:a -c:v libx264 -crf 23 -c:a aac -y res.mp4
+     cmd = [
+         "ffmpeg",
+         "-i", video_file,
+         "-i", audio_file,
+         "-vf", f"subtitles={subtitle_file}",
+         "-map", "0:v",
+         "-map", "1:a",
+         "-c:v", "libx264",
+         "-crf", str(crf_quality),
+         "-c:a", "aac",
+         "-y",
+         output_path
+     ]
+     
+     # Execute ffmpeg
+     result = subprocess.run(
+         cmd, 
+         check=True, 
+         capture_output=True, 
+         text=True
+     )
+     
+     return output_path, "✅ Video stitched successfully!"
+     
+ except subprocess.CalledProcessError as e:
+     error_msg = f"❌ FFmpeg error: {e.stderr}"
+     return None, error_msg
+ except Exception as e:
+     return None, f"❌ Error: {str(e)}"
+
+# Create Gradio interface
+with gr.Blocks(title="Video Audio Subtitle Stitcher") as app:
+ gr.Markdown(
+     """
+     # 🎬 Video Audio Subtitle Stitcher
+     Upload a video, audio, and subtitle file to stitch them together using FFmpeg.
+     
+     **The video length will be determined by the shortest stream (video or audio).**
+     """
+ )
+ 
+ with gr.Row():
+     with gr.Column():
+         video_input = gr.File(
+             label="📹 Video File (.mp4)",
+             file_types=[".mp4", ".mov", ".avi", ".mkv"]
+         )
+         audio_input = gr.File(
+             label="🎵 Audio File (.wav)",
+             file_types=[".wav", ".mp3", ".aac", ".m4a"]
+         )
+         subtitle_input = gr.File(
+             label="📝 Subtitle File (.srt)",
+             file_types=[".srt"]
+         )
+         
+         crf_input = gr.Slider(
+             minimum=18,
+             maximum=28,
+             value=23,
+             step=1,
+             label="🎨 Video Quality (CRF: lower = better quality, larger file)",
+             info="Recommended: 18-23 for high quality, 23-28 for smaller files"
+         )
+         
+         stitch_btn = gr.Button("🎬 Stitch Video", variant="primary", size="lg")
+     
+     with gr.Column():
+         status_output = gr.Textbox(
+             label="Status",
+             placeholder="Status will appear here..."
+         )
+         video_output = gr.Video(
+             label="Output Video",
+             autoplay=False
+         )
+ 
+ # Info section
+ gr.Markdown(
+     """
+     ### 📋 How it works:
+     - **Video**: Takes video stream from this file
+     - **Audio**: Replaces the video's audio with this file
+     - **Subtitle**: Overlays subtitles from SRT file on the video
+     
+     ### ⚙️ Settings:
+     - **CRF (Constant Rate Factor)**: Controls video quality
+       - 18-23: High quality (larger files)
+       - 23-28: Good quality (smaller files)
+       - Default: 23 (balanced)
+     
+     ### 🎯 Output:
+     - Codec: H.264 (libx264) for video, AAC for audio
+     - Length: Determined by shortest stream
+     """
+ )
+ 
+ # Connect the button to the function
+ stitch_btn.click(
+     fn=stitch_media,
+     inputs=[video_input, audio_input, subtitle_input, crf_input],
+     outputs=[video_output, status_output]
+ )
+
+# Launch the app
+if __name__ == "__main__":
+ app.launch()