diff --git a/comfy_api/latest/_input_impl/video_types.py b/comfy_api/latest/_input_impl/video_types.py
index 7231bf13c..a4cd3737d 100644
--- a/comfy_api/latest/_input_impl/video_types.py
+++ b/comfy_api/latest/_input_impl/video_types.py
@@ -337,7 +337,7 @@ class VideoFromComponents(VideoInput):
         if codec != VideoCodec.AUTO and codec != VideoCodec.H264:
             raise ValueError("Only H264 codec is supported for now")
         extra_kwargs = {}
-        if format != VideoContainer.AUTO:
+        if isinstance(format, VideoContainer) and format != VideoContainer.AUTO:
             extra_kwargs["format"] = format.value
         with av.open(path, mode='w', options={'movflags': 'use_metadata_tags'}, **extra_kwargs) as output:
             # Add metadata before writing any streams
diff --git a/comfy_extras/nodes_video.py b/comfy_extras/nodes_video.py
index 69fabb12e..6cf6e39bf 100644
--- a/comfy_extras/nodes_video.py
+++ b/comfy_extras/nodes_video.py
@@ -88,7 +88,7 @@ class SaveVideo(io.ComfyNode):
         )
 
     @classmethod
-    def execute(cls, video: VideoInput, filename_prefix, format, codec) -> io.NodeOutput:
+    def execute(cls, video: VideoInput, filename_prefix, format: str, codec) -> io.NodeOutput:
         width, height = video.get_dimensions()
         full_output_folder, filename, counter, subfolder, filename_prefix = folder_paths.get_save_image_path(
             filename_prefix,
@@ -108,7 +108,7 @@ class SaveVideo(io.ComfyNode):
         file = f"{filename}_{counter:05}_.{VideoContainer.get_extension(format)}"
         video.save_to(
             os.path.join(full_output_folder, file),
-            format=format,
+            format=VideoContainer(format),
             codec=codec,
             metadata=saved_metadata
         )