modified the time converting part

app.py

@@ -19,24 +19,22 @@ def delete_files(files):
     print("files deleted")
 
 def classify_input_format(input_string):
-    # check if the input string is empty
-    if not input_string:
-        return 0
-    
     # check if the input string is a valid time in the format HH:MM:SS
     hhmmss_pattern = re.compile('^\d{1,2}:\d{1,2}:\d{1,2}$')
-    if hhmmss_pattern.match(input_string):
+    if hhmmss_pattern.match(str(input_string)):
+        print("input string is a valid time in the format HH:MM:SS")
         return HHMMSS_to_sec(time_str=input_string)
     
     # check if the input string is a valid number in the format of seconds
     try:
         seconds = float(input_string)
+        print("input string is a valid number in the format of seconds")
         return float(input_string)
     except ValueError:
         pass
     
     # if the input format is neither seconds nor HH:MM:SS, return None
-    return None
+    gradio.Error("Input format not supported. Please enter a valid time in the format HH:MM:SS or seconds.")
 
 def set_output_file(input_file, output_format, folder):
     # Set output file name and extension
@@ -52,13 +50,16 @@ def set_output_file(input_file, output_format, folder):
 def trim_video_helper(input_file, output_file, start_time, end_time):
     if start_time == "":
         start_time = 0
-    if end_time == "":
+        end_time = 300
+    elif start_time != "" and end_time == "":
         end_time = 300 + HHMMSS_to_sec(time_str=start_time)
+    print("start time: ", start_time)
+    print("end time: ", end_time)
     # Trim the video
     print("start trimming")
     start_time = classify_input_format(start_time)
-    end_time = classify_input_format(end_time)
     print("start time: ", start_time)
+    end_time = classify_input_format(end_time)
     print("end time: ", end_time)
     output_file = trim_media(input_file.name, output_file, start_time, end_time)
     print("finish trimming")