python之moviepy庫的安裝與使用

目的：因爲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，所以採用分段保存視頻的方式，每500幀保存一段，然後再將視頻合到一起．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庫來完成視頻的合併．

一．安裝moviepy

1.　你首先嚐試使用 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，所以不得不採用下面這個方式）

２．採用source文件安裝．參照　https://blog.csdn.net/ucsheep/article/details/81000982　下載這個庫的source文件，然後按照目錄下的　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

 

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.

那麼就執行

pip install imageio

二．使用moviepy庫合併多個視頻

我的目錄框架是這樣的，

 

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併到一起

下面的代碼實現視頻的合併，文件的合併，多個文件夾下文件的歸併

# -*-coding:utf-8-*-
# this python script is to concatenate a sequence of videos into one


# import cv2

from moviepy.editor import *
import os
import linecache
import shutil

#inputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/大仟裏L2主幹道大圈-1591150453197/"
# outputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/concatenated/大仟裏L2主幹道大圈-1591150453197/"
inputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/大仟裏L2主幹道-1591155992285/"

outputVideoPath = "/media/yunlei/Seagate/collection_device_data/20200603/concatenated/大仟裏L2主幹道-1591155992285/"


def videoconcatenate(left_right_depth):
    print("this function is to implement concatenation")
    dirs = os.listdir(inputVideoPath)
    videoList = []
    videoCount = 0
    for videoDir in dirs:
        videoName = inputVideoPath + str(videoCount) + "/" + left_right_depth + ".mp4"
        if os.path.exists(videoName):
            videoElement = VideoFileClip(videoName)
            videoList.append(videoElement)
        videoCount = videoCount + 1
    concatenateProcessLeft = 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 data
    filePathList = []
    fileDataList = []

    fileCount = 0

    filePathes = 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 + 1

    totalline = 0
    for fileElement in filePathList:
        lineNumber = 1
        fileLength = 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 + 1
    print(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 = 0
    outputFolderPath = outputVideoPath + "/" + folderName + "/"
    folderPathes = os.listdir(inputVideoPath)
    print(folderPathes)
    for folderPath in  folderPathes:
        folerType = inputVideoPath + "/" + str(folderCount) + "/" + folderName
        print("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 + "/" + fileInFolder
                print("print totalPath")
                print(totalPath)
                if not os.path.exists(outputFolderPath):
                    os.mkdir(outputFolderPath)
                outputFileName = outputFolderPath + "/" + fileInFolder
                shutil.copyfile(totalPath, outputFileName)
        folderCount = folderCount + 1




#define the main function,from this function your users functions are called
def main():
    # combine Bluetooth folder
    combineFolders("Bluetooth")
    # combine wifi folder
    combineFolders("wifi")
    # concatenate video left
    videoconcatenate("left")
    # # # concatenate video right
    videoconcatenate("right")
    # # #concatenate video depth
    videoconcatenate("depth")
    # combinefiles("video_time")
    combinefiles("Camera_time")
    # combinefiles("Bluetooth_times")
    combinefiles("wifi_times")
#the entrance of this projrct
if __name__ == "__main__":
    main()

 

因爲是剛學習python所以很多時候並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，如果比如說我這裏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，並且文件夾上有.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))