[vlc] Re: vlc fails with network jitter

[asrao at hns.com]

Thanks for all the responses. Am very mpressed by the project and the 
level of interest shown by participants. 

First of all - -udp-caching 1000 or udp-caching 3000 did not make much 
difference to the artifacts though it did take more time before the 
picture froze. 
I believe NISTNET with jitter will NOT deliver packets in order and that 
might be the reason. I believe we have a hacked version of 
NISTNET in which in order delivery does happen  (C J can you please 
confirm) - and we'll try that next

Cheers 
Ashok
 




Christophe Massiot <massiot at via.ecp.fr>
Sent by: vlc-bounce at videolan.org
09/24/2003 07:11 PM
Please respond to vlc

 
        To:     vlc at videolan.org, vlc-devel at videolan.org
        cc:     asrao at hns.com
        Subject:        [vlc] Re: vlc fails with network jitter


À (At) 14:08 -0400 24/09/03, asrao at hns.com écrivait (wrote) :

>We used nistnet to add about 0.1 msecs max of jitter  (delay 
>variation) to a 1.5 Mbps MPEG-2 transport stream which was being 
>played
>out in unicast UDP format.  The video started blocking and finally 
>froze.  VLC works fine with less than 0.1 msec of jitter.
>For those who are interested, the setting when problems on nistnet 
>when problems started was
>  mean delay = 360 msecs and sigma (standard deviation) = 0.03

0.1 ms seems really small to me, we should handle much more than 
that. However VLC assumes that the packets arrive in order, are you 
sure this is the case ? Otherwise it would fail with TS discontinuity 
messages in the Messages window.

-- 
Christophe Massiot.

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