diff --git a/videohelpersuite/load_video_nodes.py b/videohelpersuite/load_video_nodes.py
index f94c608..03f4f1a 100644
--- a/videohelpersuite/load_video_nodes.py
+++ b/videohelpersuite/load_video_nodes.py
@@ -170,7 +170,8 @@ def cv_frame_generator(video, force_rate, frame_load_cap, skip_first_frames,
 def ffmpeg_frame_generator(video, force_rate, frame_load_cap, start_time,
                            custom_width, custom_height, downscale_ratio=8,
                            meta_batch=None, unique_id=None):
-    args_dummy = [ffmpeg_path, "-i", video, '-c', 'copy', '-frames:v', '1', "-f", "null", "-"]
+    args_input = ["-i", video]
+    args_dummy = [ffmpeg_path] + args_input +['-c', 'copy', '-frames:v', '1', "-f", "null", "-"]
     size_base = None
     fps_base = None
     try:
@@ -181,7 +182,8 @@ def ffmpeg_frame_generator(video, force_rate, frame_load_cap, start_time,
                 + e.stderr.decode(*ENCODE_ARGS))
     lines = dummy_res.stderr.decode(*ENCODE_ARGS)
     if "Video: vp9 " in lines:
-        args_dummy = args_dummy[:1] + ["-c:v", "libvpx-vp9"] + args_dummy[1:]
+        args_input = ["-c:v", "libvpx-vp9"] + args_input
+        args_dummy = [ffmpeg_path] + args_input +['-c', 'copy', '-frames:v', '1', "-f", "null", "-"]
         try:
             dummy_res = subprocess.run(args_dummy, stdout=subprocess.DEVNULL,
                                      stderr=subprocess.PIPE, check=True)
@@ -214,15 +216,13 @@ def ffmpeg_frame_generator(video, force_rate, frame_load_cap, start_time,
     if start_time > 0:
         if start_time > 4:
             post_seek = ['-ss', '4']
-            pre_seek = ['-ss', str(start_time - 4)]
+            args_input = ['-ss', str(start_time - 4)] + args_input
         else:
             post_seek = ['-ss', str(start_time)]
-            pre_seek = []
     else:
-        pre_seek = []
         post_seek = []
-    args_all_frames = [ffmpeg_path, "-v", "error", "-an"] + pre_seek + \
-            ["-i", video, "-pix_fmt", "rgba64le"] + post_seek
+    args_all_frames = [ffmpeg_path, "-v", "error", "-an"] + \
+            args_input + ["-pix_fmt", "rgba64le"] + post_seek
 
     vfilters = []
     if force_rate != 0: