Cannot play MP4 file in Allure site: Your browser does not support video tag

[ConmyCao]

I attach MP4 file to the Allure but cannot play.

Please look at my python code:

import os
import time

import allure
from PIL import ImageGrab
import numpy as np
import cv2
import datetime
import threading
from common.path_config import path

stop_flag = False  # 停止标志位


def video_record():
    name = datetime.datetime.now().strftime('%Y-%m-%d %H-%M-%S')  # 当前的时间
    p = ImageGrab.grab()  # 获得当前屏幕
    a, b = p.size  # 获得当前屏幕的大小
    fourcc = cv2.VideoWriter_fourcc(*'mp4v')  # 编码格式
    video_dir = path().work_path() + "/TestScreen_video"
    os.makedirs(video_dir, exist_ok=True)
    global video_name
    video_name = '{0}/{1}.mp4'.format(video_dir, name)
    video = cv2.VideoWriter(video_name, fourcc, 20, (a, b))  # 输出文件命名为test.mp4,帧率为16，可以自己设置
    while True:
        im = ImageGrab.grab()
        imm = cv2.cvtColor(np.array(im), cv2.COLOR_RGB2BGR)  # 转为opencv的BGR格式
        video.write(imm)
        if stop_flag:
            print("录制结束！")
            break
    video.release()


def start_screen_video():
    global th
    th = threading.Thread(target=video_record)
    th.start()
    time.sleep(1.5)
    print("we have started the video record job")


def stop_screen_video():
    global stop_flag
    stop_flag = True
    th.join()
    allure.attach.file(video_name, name="Please refer to the video recorded during these test steps:", attachment_type=allure.attachment_type.MP4)
    time.sleep(2)
    print("we have stopped the video record job")

The Attached code I used as below:
allure.attach.file(video_name, name="Please refer to the video recorded during these test steps:", attachment_type=allure.attachment_type.MP4)

I can play the attached MP4 file locally via PotPlayer

Could you please help me solve this problem?