Sending a .mp4 file over sockets in python3 - python-3.x

Question

I am trying to make two small programs; one is a server which will receive mp4 files from a client. The client is just a small program that sends a .mp4 file located in its folder.
I am able to fully send the mp4 file and a file in the same size is created, but for some reason the mp4 gets corrupted or something else goes wrong and I am unable to play the mp4 file in QuickTime player or VLC.
I don't understand this as I am copying all bytes and sending then all in small packets. I would really appreciate some help or some tips.
Server code:
#!/usr/bin/python3
from socket import socket, gethostname
s = socket()
host = gethostname()
port = 3399
s.bind((host, port))
s.listen(5)
n = 0
while True:
print("Listening for connections...")
connection, addr = s.accept()
try:
print("Starting to read bytes..")
buffer = connection.recv(1024)
with open('video_'+str(n), "wb") as video:
n += 1
i = 0
while buffer:
buffer = connection.recv(1024)
video.write(buffer)
print("buffer {0}".format(i))
i += 1
print("Done reading bytes..")
connection.close()
except KeyboardInterrupt:
if connection:
connection.close()
break
s.close()
Client code:
#!/usr/bin/python3
from socket import socket, gethostname, SHUT_WR
s = socket()
host = gethostname()
port = 3399
s.connect((host, port))
print("Sending video..")
with open("test.mp4", "rb") as video:
buffer = video.read()
print(buffer)
s.sendall(buffer)
print("Done sending..")
s.close()

Answer 1

Fix bugs in your server code:
#!/usr/bin/python3
from socket import socket, gethostname
s = socket()
host = gethostname()
port = 3399
s.bind((host, port))
s.listen(5)
n = 0
while True:
print("Listening for connections...")
connection, addr = s.accept()
try:
print("Starting to read bytes..")
buffer = connection.recv(1024)
with open('video_'+str(n)+'.mp4', "wb") as video:
n += 1
i = 0
while buffer:
video.write(buffer)
print("buffer {0}".format(i))
i += 1
buffer = connection.recv(1024)
print("Done reading bytes..")
connection.close()
except KeyboardInterrupt:
if connection:
connection.close()
break
s.close()
fix here:
with open('video_'+str(n)+'.mp4', "wb") as video:
and here:
while buffer:
video.write(buffer)
print("buffer {0}".format(i))
i += 1
buffer = connection.recv(1024)