[Live-devel] RSTP Live streaming from USB camera (Ross Finlayson)

[Giovanni Iamonte]

Hi, Ross

 

We did a more accurate investigation about the network performance, the
sendto and the buffer size.

 

what you say is clear and convinces us, but in the meantime our tests
lead us to different considerations.

 

1) we have written a little program to send UDP packets on the network,
we reach 125 Mbs, 

without lose any packets. The test program uses the sendto api.

 

2) when we use the live555 software to stream audio-video and the
bitrate  is > 2 Mbs we 

loose several packets. 

In this case we are far away from the max network capacity and the
sendto call returns 

a WSAEWOULDBLOCK error. The buffer size is 100 * 512 = 51200.

 

3) When we use the live555 with our modifications, i.e. output buffer
size = 204800, the sendto 

call always succeed. We are pretty about this sure because we left the
streaming 

for 48 hours and  we never lost any packets.

 

 

Summarizing, If we increase output buffer from 51200 to 204800 we get
rid of those errors. 

Thus, without jumping to conclusions we doubt that the OS's output
buffer fills 

up because it is not big enough to sustain the bitrate.

 

Bye

 

________________________________________________________________

Ing. Giovanni Iamonte

Area Tecnologie e sviluppi

Quintetto Srl - Pont Saint Martin (AO)

( mobile: +39 393 9196310

( tel: +39 0165 1845290

+ e-mail: iamonte at quintetto.it <mailto:iamonte at quintetto.it> 

[ web: www.quintetto.it <http://www.quintetto.it/> 

 

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