bug fix: skip downloading videos for existing folders in database/raw (…

…#21)

scripts/run_preprocess.py

@@ -114,8 +114,11 @@ def run_extract_priors(seqname, outdir, obj_class_cam):
     print("using gpus: ", gpulist)
     os.makedirs("tmp", exist_ok=True)
 
-    # download the videos
-    download_seq(vidname)
+    # check if the directory with the video already exists
+    viddir_path = os.path.join("database", "raw", vidname)
+    if not os.path.exists(viddir_path):
+        # download the videos only if the directory does not exist
+        download_seq(vidname)
 
     # set up parallel extraction
     frame_args = []