updated track.py to delete the old output.mp4 file

track.py

@@ -390,8 +390,10 @@ def MOT(yoloweights, trackingmethod, sourceVideo):
     save_dir = increment_path('exp', exist_ok=True) 
     input = os.path.join(save_dir,'out.mp4')
     outpath = 'output.mp4'  #'output/'+ 'output.mp4' 
+    if os.path.exists(outpath):
+        os.remove(outpath)
+    
     command = f"ffmpeg -i {input} -vf fps=30 -vcodec libx264 {outpath}"
     print(command)
     os.system(command)
-    #!ffmpeg -i $input -vf fps=30 -vcodec libx264 $outpath tbd
     return outpath