Update app.py

app.py

@@ -117,23 +117,33 @@ def get_best_formats_with_fallback(data: dict, requested_quality: int):
 
 def run_ytdlp_download(url: str, out_path: Path):
     """
-    Runs a single yt-dlp download using the high-speed 'aria2c' downloader.
+    Runs a single yt-dlp download, using 'aria2c' for direct files
+    and the default (or ffmpeg) downloader for HLS/m3u8 streams.
     """
     ydl_opts = {
         'outtmpl': str(out_path),
         'quiet': True,
         'noprogress': True,
-        # --- SPEED OPTIMIZATION ---
-        # Use the aria2c external downloader for multi-connection downloads
-        'external_downloader': 'aria2c',
-        # Arguments to pass to aria2c for maximum speed
-        'external_downloader_args': [
+    }
+
+    # Check if the URL is an HLS playlist.
+    # If it's NOT, we assume it's a direct file and can use the aria2c optimization.
+    if ".m3u8" not in url.lower():
+        logging.info(f"Using aria2c for direct file download: {out_path.name}")
+        # --- SPEED OPTIMIZATION (FOR DIRECT FILES) ---
+        ydl_opts['external_downloader'] = 'aria2c'
+        ydl_opts['external_downloader_args'] = [
             '--min-split-size=1M',
             '--max-connection-per-server=16',
             '--max-concurrent-downloads=16',
             '--split=16'
-        ],
-    }
+        ]
+    else:
+        logging.info(f"Using default HLS downloader for m3u8 stream: {out_path.name}")
+        # For M3U8 streams, yt-dlp will use its internal HLS downloader
+        # or FFmpeg. Since FFmpeg is already required for your merge step,
+        # this will work perfectly.
+
     with YoutubeDL(ydl_opts) as ydl:
         ydl.download([url])