Update main.py

main.py

@@ -96,14 +96,23 @@ async def create_slideshow(image_paths, audio_path, output_path, duration, zoom=
         # Add each image with zoompan effect
         for i, img in enumerate(image_paths):
             inputs.extend(["-loop", "1", "-t", str(duration), "-i", img])
-            # Apply zoom effect with custom formula
-            zoompan_params = f"z='1+(0.04*{duration})*on/{duration*25}':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d={duration*25}:s=1920x1080"
-            filter_complex += f"[{i}:v]zoompan={zoompan_params}[v{i}];"
+            # Apply zoom effect with smoother formula - slower zoom factor and better stabilization
+            # Adjust zoom rate (0.02 instead of 0.04) for smoother effect
+            fps = 25
+            zoom_factor = 0.02
+            zoompan_params = f"z='if(lte(zoom,1.0),1.0,zoom-{zoom_factor}/{fps})':d={duration*fps}:s=1920x1080:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'"
+            filter_complex += f"[{i}:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,zoompan={zoompan_params}[v{i}];"
         
-        # Concatenate all video segments
-        for i in range(len(image_paths)):
-            filter_complex += f"[v{i}]"
-        filter_complex += f"concat=n={len(image_paths)}:v=1:a=0[outv]"
+        # Concatenate all video segments with crossfade transitions
+        if len(image_paths) > 1:
+            for i in range(len(image_paths) - 1):
+                filter_complex += f"[v{i}][v{i+1}]xfade=duration=0.5:offset={duration-0.5}[v{i+1}_xf];"
+            
+            # Use the last crossfaded output
+            filter_complex += f"[v{len(image_paths)-1}_xf]copy[outv]"
+        else:
+            # If only one image, use it directly
+            filter_complex += "[v0]copy[outv]"
         
         cmd = [
             "ffmpeg",
@@ -113,12 +122,12 @@ async def create_slideshow(image_paths, audio_path, output_path, duration, zoom=
             "-map", "[outv]",
             "-map", f"{len(image_paths)}:a",
             "-c:v", "libx264",
-            "-pix_fmt", "yuv420p",
-            "-c:a", "aac",
-            "-shortest",
-            "-y",
-            "-t", str(total_duration),
-            output_path
+        process = await asyncio.create_subprocess_exec(
+            *cmd, 
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE
+        )
+        _, stderr = await process.communicate()
         ]
     
     try: