[vlc] Re: Mac OS X vlc video artifacts question

[Jean-Paul Saman]

On Linux and I believe also under MacOS X we can use sockopt() function 
to enlarge the socket buffer for HD streams, but the downside of this is 
that the application needs to be run as root.

Greetings,
Jean-Paul Saman.

Derk-Jan Hartman wrote:
> On 6-mrt-2006, at 16:38, Phil Pishioneri wrote:
> 
>> On 3/2/06 8:26 PM, Dave Schroeder wrote:
>>
>>> Does anyway know about the issue with the Mac OS X version of vlc   
>>> showing serious MPEG artifacts or pixellation with particularly  
>>> high  bandwidth network streams?
>>>
>>
>> Benjamin's email on this jogged my memory: we see this all the time  
>> -- artifacts on higher-bandwidth streams (about 10-12 Mbits/sec),  due 
>> to packets getting dropped in the network layer.
>>
>> Our fix is to increase the UDP socket buffer before VLC starts  
>> playing the stream, like so:
>>
>>    sudo sysctl -w net.inet.udp.recvspace=131072
>>
>> If this isn't sufficient, you may also have to do this
>>
>>    sudo sysctl -w kern.ipc.maxsockbuf=2097152
>>
>> (I have several network settings changed for various applications,  
>> not sure which go with which ones).  And there are others ways to  
>> make the changes permanent, etc.
> 
> 
> Mmm, this is an interesting point. Because this is not something I  can 
> tell or instruct all my users on the network to do. So what do  you guys 
> think that is the problem here? where and how should this be  fixed? 
> Because it's annoying as hell. (explains why my HD streams  behave so 
> terrible on my Macs).
> 
> Is it a problem we should report to Apple as well? Let them know  about 
> this issue?
> 
> DJ
> 

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