Merge video with base64

Question

I am merging videos in python.(ffmpeg,moviepy)

But it is very slow.

So, I am trying to encode a 1.mp4 file and a 2.mp4 file using base64 and combine them.

I have the code below.

import base64
with open('1.mp4', "rb") as videoFile:
      text = base64.b64encode(videoFile.read())
      with open("2.mp4", "rb") as videoFile:
            texts = base64.b64encode(videoFile.read())
             fh = open("dfghhffdssdf.mp4", "wb")
             fh.write(base64.b64decode(text+texts))
             fh.close()

I tried running the code and the video didn't merge. So I created a new code like below.

import base64
with open('1.mp4', "rb") as videoFile:
      text = base64.b64encode(videoFile.read())
      with open("2.mp4", "rb") as videoFile:
            texts = base64.b64encode(videoFile.read())
            text = str(text).replace("=","") + str(texts)
            fh = open("dfghhffdssdf.mp4", "wb")
            fh.write(base64.b64decode(text+texts))
            fh.close()

Then, the following error is displayed.

can only concatenate str (not "bytes") to str

Therefore, if you replace the "text" variable with bytes with the bytes function, you will get the following error: string argument without an encoding

What should I do?

If that's not possible, please tell me how to quickly merge video files.