Update yt-dlp option config for download best quality video with pc/phone support

bot/modules/media_loader/ytdlp.py

@@ -135,15 +135,21 @@ async def download_media(
         else:
             outtmpl = str(Path(output_dir) / '%(title)s.%(ext)s')
         
-        # Configure format selector for maximum quality with correct aspect ratio
-        # Priority: best video + best audio, or best combined format
-        # This ensures we get the highest quality available while maintaining original proportions
+        # Configure format selector for maximum quality with Telegram/mobile compatibility
+        # Priority: Prefer already merged formats in mp4 container
+        # This ensures compatibility with Telegram and mobile devices
         if quality == "best":
-            # Format selector for maximum quality:
-            # 1. bestvideo (highest quality video) + bestaudio (highest quality audio) - best quality
-            # 2. best (best combined format if separate streams not available) - fallback
-            # This selector maintains original aspect ratio and resolution
-            format_selector = 'bestvideo+bestaudio/best'
+            # Format selector for maximum quality with compatibility:
+            # 1. Prefer already merged mp4 files (best compatibility, no re-encoding needed)
+            # 2. bestvideo[ext=mp4]+bestaudio[ext=m4a] (mp4 container, compatible codecs)
+            # 3. bestvideo+bestaudio (fallback, will be merged to mp4)
+            # 4. best (best combined format if separate streams not available)
+            format_selector = (
+                'best[ext=mp4]/'
+                'bestvideo[ext=mp4]+bestaudio[ext=m4a]/'
+                'bestvideo[ext=mp4]+bestaudio/'
+                'bestvideo+bestaudio/best'
+            )
         else:
             # Use custom quality if specified
             format_selector = quality
@@ -155,7 +161,13 @@ async def download_media(
             'no_warnings': False,
             'progress_hooks': [progress_hook_func],
             # Merge video and audio into single file (if separate streams)
+            # Use mp4 container for maximum compatibility
             'merge_output_format': 'mp4',
+            # FFmpeg options for merging to ensure compatibility
+            # Copy streams when possible (no re-encoding), only encode if necessary
+            'postprocessor_args': {
+                'ffmpeg': ['-c:v', 'copy', '-c:a', 'aac', '-movflags', '+faststart']
+            },
             # Don't prefer free formats (they may be lower quality)
             'prefer_free_formats': False,
             # Additional options for better quality