Total_time doesn`t increase in video_detection_demo.py

[FelixCaae]

finish processing batch 74
finish processing batch 75
finish processing batch 76
Traceback (most recent call last):
File "examples/DCOD/video_detection_demo.py", line 198, in
fps = (batch_size*len(batch_list))/total_time
ZeroDivisionError: float division by zero

[PRAVESH-RATHEE]

#Load image.
video_dir = args.video

total_time = 0.0

batch_list = []

enter the time of your video in seconds at total_time . this resolved my error.]
Although faced another error:
File "examples/DCOD/it_video_detection_demo.py", line 205, in
output_size = (output[0].shape[0], output[0].shape[1])
IndexError: list index out of range

[QingxinWx]

#Load image.
video_dir = args.video

total_time = 0.0

batch_list = []

enter the time of your video in seconds at total_time . this resolved my error.]
Although faced another error:
File "examples/DCOD/it_video_detection_demo.py", line 205, in
output_size = (output[0].shape[0], output[0].shape[1])
IndexError: list index out of range

how do you resolved this error?