利用m3u8文件机制添加片头

利用m3u8文件机制添加片头：

def set_header(m3u8_file_path, header_path):
    """
    :param m3u8_file_path:  m3u8文件所在绝对路径
    :param header_path:     视频片头播放绝对路径
    :return:   False 片头已经添加， True 片头添加成功
    """
    with open(m3u8_file_path, "r", encoding='utf-8') as f:
        all_lines = f.readlines()
        for i, item in enumerate(all_lines):
            if "#EXTINF:" in item:
                vernier = i
                break
        if header_path in all_lines[vernier+1]:
            print(f"已经添加了片头，请勿重复添加")
            return False
        print(vernier)
        all_lines.insert(vernier, "#EXTINF:5,\n")   # 此处的5是时长
        all_lines.insert(vernier + 1, f"{header_path}\n")
    with open(m3u8_file_path, "w", encoding='utf-8') as w_f:
        for k_w in all_lines:
            w_f.write(f"{k_w}")
    return True
if __name__ == '__main__':
    set_header('test.m3u8', "http://xxx.xxx.com/wuxing.ts")