Can't play avi video (Anaconda 2)

edit

The code was able to execute. However, it wouldn't play the video. I copied opencv_ffmpeg.dll to C:\Anaconda2\ and saved it as opencv_ffmpeg2411_64.dll. It didn't resolve my problem.

The code below returns True.

import cv2

cap = cv2.VideoCapture(0)

print(cap.isOpened())

However, when I changed to a file name from 0. It will return False.

import cv2

cap = cv2.VideoCapture('walking.avi')

print(cap.isOpened())

Here is the code that will play 'walking.avi'.

import cv2

import numpy as np

body_classifier = cv2.CascadeClassifier('haarcascade_fullbody.xml')

cap = cv2.VideoCapture('walking.avi')

while cap.isOpened():

ret, frame = cap.read()

frame = cv2.resize(frame, None,fx=0.5, fy=0.5, interpolation = cv2.INTER_LINEAR)

gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

bodies = body_classifier.detectMultiScale(gray, 1.2, 3)

for (x,y,w,h) in bodies:

    cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 255), 2)

    cv2.imshow('Pedestrians', frame)

if cv2.waitKey(1) == 13: #13 is the Enter Key

    break

cap.release()

cv2.destroyAllWindows()