> Is there any reason this buffer is so small by default?

This value is not 'small'.  On the contrary - it's your cameras that are 
generating ridiculously 'large' frames :-)

"OutPacketBuffer::maxSize" defines the largest possible 'frame' that a server 
(or a proxy server) can send.  It's important to understand that each outgoing 
frame - if it is larger than the RTP/UDP packet size (about 1500 bytes on most 
networks) - will be broken up into multiple outgoing RTP packets, and the 
receiver must receive *all* of these packets in order to be able to reconstruct 
the frame.  In other words, if even one of these packets is lost, then the 
receiver will lose the *entire* frame.

The default 60000 byte size corresponds to a sequence of about *20* RTP/UDP 
packets (assuming a standard ~1500 byte MTU).  Internet streaming servers 
should not be generating frames that are this large.  But if they do, it's 
useful to have our code print out an error message, telling them that they're 
doing something that they shouldn't.  (Ditto if you're trying to proxy frames 
this large; this will not work if the network in front of the proxy server has 
any significant packet loss.  But if these networks happen to have no packet 
loss, then you can easily update your code to increase 
"OutPacketBuffer::maxSize".)

I might end up increasing the default "OutPacketBuffer::maxSize" to 65000 
kBytes (because such a frame would be large enough to fit inside a single 
65536-byte UDP packet - the largest possible).  But I'm not going to make the 
default size larger than this, because developers need to be aware of the 
consequences of having their servers (try to) transmit ridiculously large 
frames.


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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