去掉m3u8的片头和片尾

# pip3 install -i https://mirrors.aliyun.com/pypi/simple/ m3u8
# pip3 install -i https://mirrors.aliyun.com/pypi/simple/ oss2
# pip3 install --upgrade pip

# 在Centos中安装ffmpeg和aria2c
# https://www.cnblogs.com/littlehb/p/9347978.html

import m3u8, sys
import os, subprocess
import oss2, requests, datetime

# ========================================================================
# 前面需要截取的时间长度，单位：秒
prefixCutSeconds = 10
# 后面需要截取的时间长度，单位：秒
suffixCutSeconds = 5
# 上传的路径前缀
prefix = ‘down/M3u8_ZhengZhou103/‘

# ========================================================================
# 访问oss的用户名与密码，无需修改
access_key_id = ‘xxxxxxxxxxxx‘
access_key_secret = ‘xxxxxxxxxxxx‘
bucket_name = ‘dsideal-yy‘


# 检查是内网还是外网
def CheckInOut():
    # 探测内网外网
    print(‘正在探测使用环境是阿里云内网还是外网,请稍等...‘)
    url = ‘http://‘ + bucket_name + ‘.oss-cn-qingdao-internal.aliyuncs.com/down/Material/42/42385DBE-E03F-FF6A-A37C-CC8A04612BE4.doc‘
    try:
        requests.get(url, timeout=1)
        endpoint = ‘http://oss-cn-qingdao-internal.aliyuncs.com/‘
        print(‘内部网络访问,将使用endpoint:‘ + endpoint)
    except Exception as err:
        endpoint = ‘http://oss-cn-qingdao.aliyuncs.com/‘
        print(‘外网访问,将使用endpoint:‘ + endpoint)
    return endpoint


# 从哪个结点下进行操作
endpoint = CheckInOut()

# 从哪里下载回来，如果是内网，应该写成 http://dsideal_yy.oss-cn-qingdao-internal.aliyuncs.com
if ‘internal‘ in endpoint:
    downloadPrefixUrl = ‘http://‘ + bucket_name + ‘.oss-cn-qingdao-internal.aliyuncs.com/down/M3u8/‘
else:
    downloadPrefixUrl = ‘http://‘ + bucket_name + ‘.oss-cn-qingdao.aliyuncs.com/down/M3u8/‘


# 获取视频的时间长度
def GetVideoLength(fileName):
    cmd = "ffmpeg -i " + fileName + " 2>&1 | grep ‘Duration‘ | cut -d ‘ ‘ -f 4 | sed s/,//"
    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
    out, err = p.communicate()
    for line in out.splitlines():
        return (line.decode()[0:8])


# 将时间换算成秒数
def t2s(t):
    h, m, s = t.strip().split(":")
    return int(h) * 3600 + int(m) * 60 + int(s)


# 下载m3u8的所有ts文件
def DoActionM3u8(m3u8_url):
    # m3u8文件的真实名称
    m3u8FileName = WorkingPath + "/" + m3u8_url.split(‘/‘)[-1]
    print(‘M3u8真实文件名称：‘ + m3u8FileName)
    # 构造两个文本文件
    m3u8List = []
    m3u8FileList = []
    m3u8_obj = m3u8.load(m3u8_url)
    for l in m3u8_obj.segments:
        m3u8List.append(downloadPrefixUrl + l.uri[0:2] + ‘/‘ + l.uri)
        m3u8FileList.append("file ‘" + l.uri + "‘")

    # 形成文本文件,这个用于调用aria2c进行批量下载使用
    tempFile = WorkingPath + ‘/url.txt‘
    result = map(lambda x: x.strip() + ‘\n‘, m3u8List)
    with open(tempFile, ‘w‘) as f:
        f.writelines(result)

    # 下载回来转码后的视频ts
    cmd = ‘aria2c -c -s 4 -d ‘ + WorkingPath + ‘ -j 8 -i ‘ + tempFile
    os.system(cmd)

    # 形成文本文件，用于将ts文件拼接成大的ts文件时使用
    tempFile = WorkingPath + ‘/mylist.txt‘
    result = map(lambda x: x.strip() + ‘\n‘, m3u8FileList)
    with open(tempFile, ‘w‘) as f:
        f.writelines(result)

    # 使用ffmpeg 拼成大的ts
    tempAllTs = WorkingPath + ‘/output.ts‘
    if os.path.exists(tempAllTs):
        os.remove(tempAllTs)

    tempAllTs_new = WorkingPath + ‘/output_new.ts‘
    if os.path.exists(tempAllTs_new):
        os.remove(tempAllTs_new)

    tempAllMp4 = WorkingPath + ‘/output.mp4‘
    if os.path.exists(tempAllMp4):
        os.remove(tempAllMp4)

    tempAllMp4_new = WorkingPath + ‘/output_new.mp4‘
    if os.path.exists(tempAllMp4_new):
        os.remove(tempAllMp4_new)

    # 拼接为原始的ts
    cmd = ‘ffmpeg -f concat -i ‘ + tempFile + ‘ -c copy ‘ + tempAllTs + ‘ -y‘
    os.system(cmd)
    #
    # 将大的ts转为mp4
    cmd = ‘ffmpeg -i ‘ + tempAllTs + ‘ -c:v copy -c:a copy -bsf:a aac_adtstoasc ‘ + tempAllMp4
    os.system(cmd)
    os.remove(tempAllTs)
    # 以下为new的步骤=========================================================================
    #
    #  截取一部分
    # (1) 测出文件有多长
    videoLength = GetVideoLength(tempAllMp4)
    # 去掉后suffixCutSeconds秒
    seconds = t2s(videoLength) - suffixCutSeconds
    m, s = divmod(seconds, 60)
    h, m = divmod(m, 60)
    endTime = "%02d:%02d:%02d" % (h, m, s)

    # 开始的秒数
    m, s = divmod(prefixCutSeconds, 60)
    h, m = divmod(m, 60)
    startTime = "%02d:%02d:%02d" % (h, m, s)
    # #
    # # (2)去头部prefixCutSeconds秒，尾部suffixCutSeconds秒
    print(‘截取并生成mp4!‘)
    cmd = ‘ffmpeg  -i ‘ + tempAllMp4 + ‘ -vcodec copy -acodec copy -ss ‘ + startTime + ‘ -to ‘ + endTime + ‘ ‘ + tempAllMp4_new + ‘ -y‘
    os.system(cmd)
    os.remove(tempAllMp4)
    print(‘生成新mp4成功！到这里都是非常正常的！！！！！‘)

    # (3) mp4 转 ts
    cmd = ‘ffmpeg -y -i ‘ + tempAllMp4_new + ‘ -vcodec copy -acodec copy -vbsf h264_mp4toannexb ‘ + tempAllTs_new
    os.system(cmd)
    os.remove(tempAllMp4_new)

    # (4) 切割ts
    prefixName = m3u8_url.split(‘/‘)[-1][0:36]
    cmd = ‘ffmpeg -i ‘ + tempAllTs_new + ‘ -c copy -map 0 -f segment -segment_list ‘ + WorkingPath + ‘/‘ + prefixName + ‘.m3u8 -segment_time 10 ‘ + WorkingPath + ‘/‘ + prefixName + ‘%03d.ts‘
    os.system(cmd)
    os.remove(tempAllTs_new)

    # (5)上传到oss，放到另一个目录下
    path = os.listdir(os.getcwd()+‘/M3u8‘)
    for filename in path:
        if os.path.isfile(WorkingPath+‘/‘+filename):
            if ‘.m3u8‘ in filename or ‘.ts‘ in filename:
                logInfo(‘开始进行文件上传:‘ + filename)
                key = prefix +  filename[0:2] + ‘/‘ + filename
                bucket.put_object_from_file(key, WorkingPath + ‘/‘ + filename, progress_callback=percentage)
                print(‘文件上传云存储成功完成！‘ + filename)


# 黄海定义的输出信息的办法，带当前时间
def logInfo(msg):
    i = datetime.datetime.now()
    print(" %s            %s" % (i, msg))


# 进度条功能
def percentage(consumed_bytes, total_bytes):
    if total_bytes:
        per = int(100 * (float(consumed_bytes)) / (float(total_bytes)))
        s1 = "\r[%s%s]%d%%" % ("=" * int(per), " " * (100 - int(per)), per)
        sys.stdout.write(s1)
        sys.stdout.flush()


if __name__ == ‘__main__‘:
    # 删除临时目录并重新创建
    WorkingPath = ‘/usr/local/software/TestM3u8/M3u8‘
    os.system(‘rm -rf ‘ + WorkingPath)
    os.mkdir(WorkingPath)

    # 构建OSS存储对象
    auth = oss2.Auth(access_key_id, access_key_secret)
    # 阿里云上应该用这个内部网络选项
    bucket = oss2.Bucket(auth, endpoint, bucket_name)

    # 以一个名师云课为例
    m3u8_url = downloadPrefixUrl+‘C4/C4CD770E-C98A-AF8C-8B53-8541210B355B.m3u8‘
    print(m3u8_url)
    DoActionM3u8(m3u8_url)
# http://video.edusoa.com/down/M3u8_ZhengZhou103/C4/C4CD770E-C98A-AF8C-8B53-8541210B355B.m3u8
# http://dsideal-yy.oss-cn-qingdao.aliyuncs.com/down/M3u8_ZhengZhou103/C4/C4CD770E-C98A-AF8C-8B53-8541210B355B.m3u8
#