Update app.py

app.py

@@ -74,7 +74,7 @@ def convert_video(use_youtube, youtube_url, video_file, downscale, faster, use_m
             input_path = video_file
 
     # Build the FFmpeg command.
-    ffmpeg_cmd = ['ffmpeg', '-hwaccel', accel, '-y', '-i', input_path] + extra.split()
+    ffmpeg_cmd = ['./ffmpeg', '-hwaccel', accel, '-y', '-i', input_path] + extra.split()
     
     if downscale:
         ffmpeg_cmd.extend(['-vf', 'scale=144:-2'])