利用python+ffmpeg合併B站視訊及格式轉換 B站客戶端下載的視訊一般有兩種格式：早期的多為blv格式（由flv格式轉換而來，音視訊軌道在同一檔案下）。

如今的多為m4s格式，音訊軌視訊軌分開 以下為利用ffmpeg簡單對檔案處理，使其轉換為大多數播放器能正常播放的mp4格式 前提：已正常安裝ffmpeg

import tkinter as tk
from tkinter import filedialog
import os
import tkinter.messagebox
from tkinter import ttk
mainGUI=tk.Tk()
width = 400
height = 400
screenwidth = mainGUI.winfo_screenwidth()
screenheight = mainGUI.winfo_screenheight()
alignstr = '%dx%d+%d+%d' % (width,height,(screenwidth-width)/2,(screenheight-height)/2)
mainGUI.geometry(alignstr)
mainGUI.title("轉碼系統")
def browseDialog():
 root = tk.Tk()
 root.withdraw()
 return filedialog.askopenfilename()
def browseDialogTo():
 path=browseDialog()
 var.set(path)
def browseDialogTo2():
 path=browseDialog()
 var2.set(path)
def browseDialogTof2():
 path=browseDialog()
 varf2.set(path)
def browseDialogTof3():
 path=browseDialog()
 varf3.set(path)
def browseDialogTof4():
 path=browseDialog()
 varf4.set(path)

tab = ttk.Notebook(mainGUI)

frame0 = tk.Frame(tab)
tab6 = tab.add(frame0,text = "m4s轉mp4")

frame1 = tk.Frame(tab)
tab1 = tab.add(frame1,text = "blv,flv轉mp4")

frame2 = tk.Frame(tab)
tab2 = tab.add(frame2,text = "提取音訊")

frame3 = tk.Frame(tab)
tab3 = tab.add(frame3,text = "音訊擷取")

tab.pack(expand = True,fill = tk.BOTH)

#----------------------------------------------------------------------------------------------#
l1=tk.Label(frame0,text = "請選擇視訊檔案",font=('Arial',15),width=100,height=2)
l1.pack()
var=tk.StringVar()
var.set("")
e1 = tk.Entry(frame0,textvariable = var,show = None)#顯示成明文形式
e1.pack()
b1=tk.Button(frame0,text='瀏覽',width=6,height=2,command=browseDialogTo)
b1.pack()

l2=tk.Label(frame0,text = "請選擇音訊檔案",height=2)
l2.pack()
var2=tk.StringVar()
var2.set("")
e2 = tk.Entry(frame0,textvariable = var2,show = None)#顯示成明文形式
e2.pack()
b2=tk.Button(frame0,command=browseDialogTo2)
b2.pack()

l3=tk.Label(frame0,text = "請輸入新檔案命名",height=2)
l3.pack()
e3 = tk.Entry(frame0,show = None)#顯示成明文形式
e3.pack()

def myCMD(path1,path2,name):
 ver=os.popen("FFmpeg -i "+path1+" -i "+path2+" -codec copy "+"C:\\Users\\renboyu010214\\Desktop\\outputFile\\"+name+".mp4")
 ver.close()
def myCMDmain():
 path1=e1.get()
 path2=e2.get()
 name=e3.get()
 myCMD(path1,name)
 tkinter.messagebox.showinfo(title='success',message="轉碼成功！")
b4=tk.Button(frame0,text='確定',command=myCMDmain)
b4.pack()
#----------------------------------------------------------------------------------------------#
lf2=tk.Label(frame1,text = "請選擇blv或flv檔案",height=2)
lf2.pack()
varf2=tk.StringVar()
varf2.set("")
ef2 = tk.Entry(frame1,textvariable = varf2,show = None)#顯示成明文形式
ef2.pack()
bf2=tk.Button(frame1,command=browseDialogTof2)
bf2.pack()
lf2_1=tk.Label(frame1,height=2)
lf2_1.pack()
ef2_1 = tk.Entry(frame1,show = None)#顯示成明文形式
ef2_1.pack()
def myCMDmainf2():
 path1=ef2.get()
 name=ef2_1.get()
 ver=os.popen("ffmpeg -i "+path1+" "+"C:\\Users\\renboyu010214\\Desktop\\outputFile\\"+name+".mp4")
 ver.close()
 tkinter.messagebox.showinfo(title='success',message="轉碼成功！")
bf2=tk.Button(frame1,command=myCMDmainf2)

bf2.pack()

#----------------------------------------------------------------------------------------------#
lf3=tk.Label(frame2,height=2)
lf3.pack()
varf3=tk.StringVar()
varf3.set("")
ef3 = tk.Entry(frame2,textvariable = varf3,show = None)#顯示成明文形式
ef3.pack()
bf3=tk.Button(frame2,command=browseDialogTof3)######
bf3.pack()
lf3_1=tk.Label(frame2,height=2)
lf3_1.pack()
ef3_1 = tk.Entry(frame2,show = None)#顯示成明文形式
ef3_1.pack()
def myCMDmainf3():
 path1=ef3.get()
 name=ef3_1.get()
 ver=os.popen("ffmpeg -i "+path1+" -acodec copy -vn "+"C:\\Users\\renboyu010214\\Desktop\\outputFile\\"+name+".aac") 
 #ffmpeg -i F:\video\冠世一戰.mp4 -acodec copy -vn F:\video\output.aac
 ver.close()
 tkinter.messagebox.showinfo(title='success',message="音訊提取成功！")
bf3=tk.Button(frame2,command=myCMDmainf3)

bf3.pack()

#----------------------------------------------------------------------------------------------#

#----------------------------------------------------------------------------------------------#
lf4=tk.Label(frame3,text = "請選擇音訊/視訊檔案",height=2)
lf4.pack()
varf4=tk.StringVar()
varf4.set("")
ef4 = tk.Entry(frame3,textvariable = varf4,show = None)#顯示成明文形式
ef4.pack()
bf4=tk.Button(frame3,command=browseDialogTof4)######
bf4.pack()
lf4_1=tk.Label(frame3,text = "請輸入新檔案命名（音訊字尾.mp3 視訊字尾.mp4）",height=2)
lf4_1.pack()
ef4_1 = tk.Entry(frame3,show = None)#顯示成明文形式
ef4_1.pack()
lf4_2=tk.Label(frame3,text = "請輸入開始時間（xx:xx:xx）",height=2)
lf4_2.pack()
ef4_2 = tk.Entry(frame3,show = None)#顯示成明文形式
ef4_2.pack()
lf4_3=tk.Label(frame3,text = "請輸入擷取時間（xx:xx:xx）",height=2)
lf4_3.pack()
ef4_3 = tk.Entry(frame3,show = None)#顯示成明文形式
ef4_3.pack()
def myCMDmainf4():
 path1=ef4.get()
 name=ef4_1.get()
 startTime=ef4_2.get()
 time=ef4_3.get()
 ver=os.popen("ffmpeg -ss "+startTime+" -t "+time+" -i "+path1+" -vcodec copy -acodec copy "+"C:\\Users\\renboyu010214\\Desktop\\outputFile\\"+name) 
 #ffmpeg -ss 00:00:00 -t 00:00:05 -i input.mp4 -vcodec copy -acodec copy output.mp4 
 ver.close()
 tkinter.messagebox.showinfo(title='success',message="音訊/視訊擷取成功！")
bf4=tk.Button(frame3,command=myCMDmainf4)

bf4.pack()

#----------------------------------------------------------------------------------------------#

mainGUI.mainloop()

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