This is also known as Streaming Packet size
This is used to limit the size of each video packet to reduce fragmentation.
Larger packets have less overhead, but if the packet is larger than the network packet size, the packet will be fragmented - split into multiple pieces, then reassembled on the playing computer.
Fragmented packets will have little effect on playback unless one of the fragments is lost - and with broadband streaming, players may even be able to recover from lost packets.
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