Multicast Streaming ?

[liquidcool]

Hi there,

Is there any knowledge if multicast streaming will be implemented in VLC ?

[Jean-Baptiste Kempf]

It is inside VLC since around 5 years...

[liquidcool]

Please excuse my ignorance, but where ? and how do you set it up ?

[thannoy]

You will maybe have to read some documentation about multicast usage.

one example with VLC:
- server side : stream to udp://239.0.0.0:7777
- clients side: listen on udp://@239.0.0.0:7777

links:
http://wiki.videolan.org/Documentation:Streaming_HowTo

[liquidcool]

I have set that up, but it won't work.

I have spoken to our network guys and they have noticed on the UDP packet the TTL is set to 1 and as a result it is not even reaching the switches. I tried to set it to any number in the gui and it still will not change it. Wireshark still shows the packet as having a TTL of 1.

Is this a bug ?

[thannoy]

Maybe you can use --ttl option.

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--ttl <integer> Hop limit (TTL) This is the hop limit (also known as "Time-To-Live" or TTL) of the multicast packets sent by the stream output (-1 = use operating system built-in default).

[liquidcool]

When I add that into the gui it still comes out with a TTL of 1

[thannoy]

Try to modify it in configs.
Preferences > select "all" (bottom left) to have the full option list in the left side.
Then Stream output> access output and modify TTL config here, save, restart VLC.

[liquidcool]

Great. Got that sorted out. Now i have another issue. Trying to receive the stream on the client, nothing comes through. Just sits there and says Buff: 0%

Running Wireshark on the client I see the UDP packets coming into the machine, but VLC does not play anything.

[thannoy]

if your receiver is on lunix, you can try (requires root privileges):

Code: Select all

ifconfig eth0 allmulti

If will ask the network card to not filter multicast. Normally, if should not be needed since when a client try to listn a multicast stream, it ask the network card to unfilter the specific multicast it is waiting for. But in case.

[liquidcool]

The client is on Windows. And, as I said, wireshark is showing the stream coming onto the client PC, so I don't think there is a problem with the nic filtering multicast traffic. VLC Player just does not want to play the stream at all.