diff --git a/scripts/deforum_helpers/blocking_file_list.py b/scripts/deforum_helpers/blocking_file_list.py
new file mode 100644
index 000000000..528506924
--- /dev/null
+++ b/scripts/deforum_helpers/blocking_file_list.py
@@ -0,0 +1,25 @@
+import os
+import time
+
+class BlockingFileList:
+    def __init__(self, base_directory, expected_file_count=0, extension=".jpg"):
+        self.base_directory = base_directory
+        self.expected_file_count = expected_file_count
+        self.extension = extension
+
+    def __getitem__(self, index):
+        file_path = os.path.join(self.base_directory, str(index) + self.extension)
+        timeout = 30  # Maximum wait time of 30s
+        start_time = time.time()
+
+        while not os.path.exists(file_path):
+            waited = time.time() - start_time
+            if waited >= timeout:
+                raise FileNotFoundError(f"File {file_path} not found after waiting for {timeout} seconds")
+            print(f"Could not find file {file_path}. Waiting for it to appear (waited {waited}/{timeout})...")
+            time.sleep(1)  # Wait for 1 second before checking again
+
+        return file_path
+
+    def __len__(self):
+        return self.expected_file_count
\ No newline at end of file
diff --git a/scripts/deforum_helpers/hybrid_video.py b/scripts/deforum_helpers/hybrid_video.py
index fdff95d71..f1e60af81 100644
--- a/scripts/deforum_helpers/hybrid_video.py
+++ b/scripts/deforum_helpers/hybrid_video.py
@@ -26,6 +26,8 @@
 from .human_masking import video2humanmasks
 from .load_images import load_image
 from .video_audio_utilities import vid2frames, get_quick_vid_info, get_frame_name
+from .blocking_file_list import BlockingFileList
+from modules.shared import opts
 
 def delete_all_imgs_in_folder(folder_path):
         files = list(pathlib.Path(folder_path).glob('*.jpg'))
@@ -78,11 +80,15 @@ def hybrid_generation(args, anim_args, root):
     inputfiles = sorted(pathlib.Path(video_in_frame_path).glob('*.jpg'))
 
     if not anim_args.hybrid_use_init_image:
-        # determine max frames from length of input frames
+        if opts.data.get("deforum_allow_blocking_input_framelists", False):
+            print(f"Will wait for input frames to appear in {video_in_frame_path}")
+            inputfiles = BlockingFileList(hybrid_frame_path, anim_args.max_frames, ".jpg")
+        elif len(inputfiles) < 1:
+            raise Exception(f"Error: No input frames found in {video_in_frame_path}! Please check your input video path and whether you've opted to extract input frames.") 
+        
         anim_args.max_frames = len(inputfiles)
-        if anim_args.max_frames < 1:
-            raise Exception(f"Error: No input frames found in {video_in_frame_path}! Please check your input video path and whether you've opted to extract input frames.")
-        print(f"Using {anim_args.max_frames} input frames from {video_in_frame_path}...")
+
+    print(f"Using {anim_args.max_frames} input frames from {video_in_frame_path}...")
 
     # use first frame as init
     if anim_args.hybrid_use_first_frame_as_init_image:
diff --git a/scripts/deforum_helpers/ui_settings.py b/scripts/deforum_helpers/ui_settings.py
index ec0fd91a8..21077e205 100644
--- a/scripts/deforum_helpers/ui_settings.py
+++ b/scripts/deforum_helpers/ui_settings.py
@@ -35,3 +35,4 @@ def on_ui_settings():
     opts.add_option("deforum_save_gen_info_as_srt_params", OptionInfo(['Noise Schedule'], "Choose which animation params are to be saved to the .srt file (Frame # and Seed will always be saved):", ui_components.DropdownMulti, lambda: {"interactive": True, "choices": srt_ui_params}, section=section)) 
     opts.add_option("deforum_preview", OptionInfo("Off", "Generate preview video during generation? (Preview does not include frame interpolation or upscaling.)", gr.Dropdown, {"interactive": True, "choices": ['Off', 'On', 'On, concurrent (don\'t pause generation)']}, section=section))
     opts.add_option("deforum_preview_interval_frames", OptionInfo(100, "Generate preview every N frames", gr.Slider, {"interactive": True, "minimum": 10, "maximum": 500}, section=section))
+    opts.add_option("deforum_allow_blocking_input_framelists", OptionInfo(False, "If a hybrid video input frame is not found, wait for up to 30s for it to appear. This allows hybrid video input frames to be generated by concurrent processes.", gr.Checkbox, {"interactive": True}, section=section))  
\ No newline at end of file