目的：因為需要保存一個大大的.mp4視頻，以防過程中設備出現異常導致整個長長的視頻無法正常保存，所以采用分段保存視頻的方式，每500幀保存一段，然后再將視頻合到一起．最近剛開始學習python,發現python真的很好用，所以這次就使用python中的moviepy庫來完成視頻的合并．

一．安裝moviepy

1.　你首先嘗試使用 pip install moviepy指令是否可以正常安裝moviepy庫（我在python2.7上和python3.7上都嘗試了這中安裝方式都安裝不了，所以不得不采用下面這個方式）

２．采用source文件安裝．參照　https://blog.csdn.net/ucsheep/article/details/81000982　下載這個庫的source文件，然后按照目錄下的　README.rst　的指示安裝，

首先cd到你下載的目錄文件下，順序執行　

$ (sudo) pip install ez_setup
$　(sudo) python setup.py install

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如果有錯誤提示

ERROR: moviepy 1.0.3 has requirement imageio<2.5,>=2.0, but you'll have imageio 2.8.0 which is incompatible.

那么就執行

pip install imageio

二．使用moviepy庫合并多個視頻

我的目錄框架是這樣的，

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上面的每個文件目錄下的文件是這樣的．

?Bluetooth文件目錄

?wifi文件目錄

?首先是將目錄下的所有視頻都合并到一起

下面的代碼實現視頻的合并，文件的合并，多個文件夾下文件的歸并

# -*-coding:utf-8-*-
# this python script is to concatenate a sequence of videos into one# import cv2from moviepy.editor import *
import os
import linecache
import shutil#inputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/大仟里L2主干道大圈-1591150453197/"
# outputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/concatenated/大仟里L2主干道大圈-1591150453197/"
inputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/大仟里L2主干道-1591155992285/"outputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/concatenated/大仟里L2主干道-1591155992285/"def videoconcatenate(left_right_depth):print("this function is to implement concatenation")dirs = os.listdir(inputVideoPath)videoList = []videoCount = 0for videoDir in dirs:videoName = inputVideoPath + str(videoCount) + "/" + left_right_depth + ".mp4"if os.path.exists(videoName):videoElement = VideoFileClip(videoName)videoList.append(videoElement)videoCount = videoCount + 1concatenateProcessLeft = concatenate_videoclips(videoList)concatenateProcessLeft.to_videofile(outputVideoPath + "/" + left_right_depth + ".mp4", fps = 20,  remove_temp = False)def combinefiles(fileName):print("start to comebine files")#This list is used to store all file datafilePathList = []fileDataList = []fileCount = 0filePathes = os.listdir(inputVideoPath)for filePath in filePathes:fileType = inputVideoPath + str(fileCount) + "/" + fileName + ".txt"if os.path.exists(fileType):filePathList.append(fileType)# print(fileType)fileCount = fileCount + 1totalline = 0for fileElement in filePathList:lineNumber = 1fileLength = len(open(fileElement, encoding='utf-8').readlines())totalline = totalline + fileLength#print(fileLength)while lineNumber <= fileLength:line = linecache.getline(fileElement, lineNumber)#print(line)line = line.strip()fileDataList.append(line)lineNumber = lineNumber + 1print(totalline)fileAll = open(outputVideoPath + "/" + fileName + ".txt", 'w+', encoding='utf-8')for i, p in enumerate(fileDataList):print(i,p)fileAll.write(p+'\n')fileAll.close()def combineFolders(folderName):folderList = []folderCount = 0outputFolderPath = outputVideoPath + "/" + folderName + "/"folderPathes = os.listdir(inputVideoPath)print(folderPathes)for folderPath in  folderPathes:folerType = inputVideoPath + "/" + str(folderCount) + "/" + folderNameprint("folderType")print(folerType)print("start to copy file")if os.path.exists(folerType):filesInFolder  = os.listdir(folerType)print("filesInFolder")print(filesInFolder)for fileInFolder in  filesInFolder:totalPath = folerType + "/" + fileInFolderprint("print totalPath")print(totalPath)if not os.path.exists(outputFolderPath):os.mkdir(outputFolderPath)outputFileName = outputFolderPath + "/" + fileInFoldershutil.copyfile(totalPath, outputFileName)folderCount = folderCount + 1#define the main function,from this function your users functions are called
def main():# combine Bluetooth foldercombineFolders("Bluetooth")# combine wifi foldercombineFolders("wifi")# concatenate video leftvideoconcatenate("left")# # # concatenate video rightvideoconcatenate("right")# # #concatenate video depthvideoconcatenate("depth")# combinefiles("video_time")combinefiles("Camera_time")# combinefiles("Bluetooth_times")combinefiles("wifi_times")
#the entrance of this projrct
if __name__ == "__main__":main()

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因為是剛學習python所以很多時候并不知哪個用法更合適，所以那就嘗試一下，比如下面這兩個遍歷路徑下的文件的方式，

for videoDir in dirs:

這種，會將dirs路徑下的所有文件都獲取到，如果比如說我這里的路徑下就包括了文件加和文件，而我希望對文件夾做處理，所以我就要先將文件夾挑揀出來．下面就是我只檢索那些是文件夾，并且文件夾上有.mp4格式視頻的文件目錄我才把他們count in.

    videoLeft = inputVideoPath + str(videoCount) + "/" + "left.mp4"videoRight = inputVideoPath + str(videoCount) + "/" + "right.mp4"videoDepth = inputVideoPath + str(videoCount) + "/" + "depth.mp4"if os.path.exists(videoLeft):

第二種，這種os.walk(path)的方式可以返回root就是根目錄path，dirs就是root目錄下所有的文件夾，以及文件夾下的文件夾，files就是root path下所有的文件．所以你需要根據你的需求來選擇使用哪種遍歷方式．

for root, dirs, files in os.walk(inputVideoPath):for name in files:print(os.path.join(root, name))for name in dirs:print(os.path.join(root, name))
print(len(videoLeftAll))

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