Update app.py

app.py

@@ -21,17 +21,18 @@ def generate_slideshow(images, duration, texts=None, y_pos=0.5, fade_duration=0.
         clip_path = Path(temp_dir) / f"clip_{i}.mp4"
         text = texts[i] if i < len(texts) else ""
 
-        drawtext = ""
+        # Scale + Pad Filter
+        vf_filters = "scale='min(1280,iw)':-2,pad=1280:720:(1280-iw)/2:(720-ih)/2:color=black,fps=25,format=yuv420p"
+
+        # Text Overlay Filter
         if text:
             safe_text = text.replace(":", "\\:").replace("'", "\\'")
-            drawtext = (
-                f",drawtext=text='{safe_text}':fontcolor=white:fontsize={font_size}:borderw=2:"
+            drawtext_filter = (
+                f"drawtext=text='{safe_text}':fontcolor=white:fontsize={font_size}:borderw=2:"
                 f"x=(w-text_w)/2:y=(h-text_h)*{y_pos}:"
                 f"alpha='if(lt(t,{fade_duration}), t/{fade_duration}, if(lt(t,{duration}-{fade_duration}), 1, ({duration}-t)/{fade_duration}))'"
             )
-
-        # scale + pad für schwarze Ränder, Bild bleibt proportional
-        vf = f"scale='min(1280,iw)':-2,pad=1280:720:(1280-iw)/2:(720-ih)/2:color=black,fps=25,format=yuv420p{drawtext}"
+            vf_filters += f",{drawtext_filter}"
 
         cmd = [
             "ffmpeg",
@@ -39,13 +40,13 @@ def generate_slideshow(images, duration, texts=None, y_pos=0.5, fade_duration=0.
             "-loop", "1",
             "-i", str(img_path),
             "-t", str(duration),
-            "-vf", vf,
+            "-vf", vf_filters,
             str(clip_path)
         ]
         try:
-            subprocess.run(cmd, check=True)
+            subprocess.run(cmd, check=True, capture_output=True, text=True)
         except subprocess.CalledProcessError as e:
-            return None, f"❌ FFmpeg Fehler:\n{e.stderr}"
+            return None, f"❌ FFmpeg Fehler bei Bild {i+1}:\n{e.stderr}"
 
         clips.append(clip_path)
 
@@ -66,7 +67,7 @@ def generate_slideshow(images, duration, texts=None, y_pos=0.5, fade_duration=0.
         str(output_file)
     ]
     try:
-        subprocess.run(cmd_concat, check=True)
+        subprocess.run(cmd_concat, check=True, capture_output=True, text=True)
     except subprocess.CalledProcessError as e:
         return None, f"❌ FFmpeg Concat Fehler:\n{e.stderr}"
 
@@ -77,7 +78,7 @@ def generate_slideshow(images, duration, texts=None, y_pos=0.5, fade_duration=0.
 
 # Gradio UI
 with gr.Blocks() as demo:
-    gr.Markdown("# Slideshow mit fixiertem Text-Overlay & schwarzen Rändern")
+    gr.Markdown("# Slideshow mit Text-Overlay & schwarzen Rändern")
 
     img_input = gr.Files(label="Bilder auswählen (mehrere)", file_types=allowed_medias)
     duration_input = gr.Number(value=3, label="Dauer pro Bild in Sekunden", precision=1)