Fix frame images timestamp input validation and parsing

Use FLOAT for timestamp fields, handle invalid strings gracefully,
update node description, and reset empty timestamp values in the UI
when Use Timestamp is disabled.

clientlibs/utils.js

@@ -5042,6 +5042,13 @@ function videoInputsFrameToggleHandler(frameImagesNode) {
         function toggleEnabled() {
             const enabled = useWidget.value === true;
 
+            // FLOAT timestamp widgets: avoid '' on disabled slots (ComfyUI validation error)
+            if (!enabled && paramName && paramName.startsWith("timestamp")) {
+                if (paramWidget.value === "" || paramWidget.value == null) {
+                    paramWidget.value = 0.0;
+                }
+            }
+
             if (paramWidget.inputEl) {
                 paramWidget.inputEl.disabled = !enabled;
                 paramWidget.inputEl.style.opacity = enabled ? "1" : "0.5";

modules/videoInputsFrame.py

@@ -27,8 +27,11 @@ class RunwareVideoInputsFrameImages:
                 "tooltip": "Enable to set a timestamp (seconds) within the input video.",
                 "default": False,
             })
-            optionalInputs[f"timestamp{i}"] = ("STRING", {
-                "default": "0",
+            optionalInputs[f"timestamp{i}"] = ("FLOAT", {
+                "default": 0.0,
+                "min": 0.0,
+                "max": 9999.0,
+                "step": 0.01,
                 "tooltip": "Timestamp in seconds (hundredths supported, e.g. 3.44). Only used when 'Use Timestamp' is enabled.",
             })
 
@@ -39,7 +42,7 @@ class RunwareVideoInputsFrameImages:
 
     DESCRIPTION = (
         "Build inputs.frameImages entries for video inference: "
-        "{image: base64}, {image: base64, frame: first|last|<int>}, or "
+        "{image: base64}, {image: base64, frame: first|last}, or "
         "{image: base64, timestamp: seconds}."
     )
     FUNCTION = "createFrameInputs"
@@ -58,7 +61,7 @@ class RunwareVideoInputsFrameImages:
             use_frame = kwargs.get(f"useFrame{i}", False)
             frame_position = kwargs.get(f"frame{i} position", "first")
             use_timestamp = kwargs.get(f"useTimestamp{i}", False)
-            timestamp = self._parse_timestamp(kwargs.get(f"timestamp{i}", "0"))
+            timestamp = self._parse_timestamp(kwargs.get(f"timestamp{i}", 0.0))
 
             frameImages.append(
                 self._createFrameEntry(
@@ -83,7 +86,10 @@ class RunwareVideoInputsFrameImages:
             stripped = value.strip()
             if stripped == "":
                 return default
-            return max(0.0, float(stripped))
+            try:
+                return max(0.0, float(stripped))
+            except ValueError:
+                return default
         return default
 
     def _createFrameEntry(self, image, use_frame, frame_position, use_timestamp, timestamp):