Different results when sending via UDP

Question

I am writing a program for video transmission - it uses OpenCV for splitting video into frames and then sends them via UDP.

Problem is - when I send I get different results - sometimes only few frames are sent, sometimes they are corrupted. It is weird because I am sending to localhost (127.0.0.1) and there should not be any data loss.

I am sending frames by chuncks, size of each chunk is 10240 bytes.

I also use Winsock 2 with blocking sockets.

What can be a root cause of this problem?

Yes, but when I am trying to perform communication via TCp it works really slow. — unresolved_external, Dec 08 '12 at 16:26

paxdiablo · Answer 1 · 2012-12-08T14:57:37.770

1

You are aware that the U in UDP stands for unreliable, yes? No, not really, but it's a good way to remember that the protocol doesn't guarantee delivery.

If you need guaranteed delivery, you should be using TCP.

edited Dec 08 '12 at 14:57

answered Dec 08 '12 at 14:48

paxdiablo

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UDP: User Datagram Protocol, but indeed it's not reliable. – Mat Dec 08 '12 at 14:51
Or add sequence numbers to the user protocol. – John Dibling Dec 08 '12 at 17:06
All you need to know right there in Pax's answer. No guaranteed delivery unless you write the layer yourself. – Greg Pettit Dec 10 '12 at 04:56

score 0 · Answer 2 · answered Dec 08 '12 at 14:48

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The first few results from https://www.google.com/search?q=udp+localhost+packet+loss suggest you can lose packets even when sending to localhost.

answered Dec 08 '12 at 14:48

ChrisW

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Different results when sending via UDP

2 Answers2