The VideoLAN Forums

Hi,

I am trying to point my VLC at a videostream from a hardware CODEC. The CODEC is set up to issue a multicast rtsp stream on IP 224.0.0.1, port 50000. The VLC client and the codecs are all on the same subnet and connected to a switch which is able to deal with multicast data.

To connect to this am trying:

vlc rtsp://@224.0.0.1:50000

But get an error window, and am told to check the log

Three questions:

Is my syntaxt correct?
If no, what shoudl it be?
Where is the log reffered to in the dialogue window stored?

Cheers,

Ben

Hi,

1 - Your syntax is "gramaticaly" correct I think, but using RTSP through multicast is somethink ambigous in my opinion (even no meaning). RTSP is for VOD-like solutions ; so should one client be able to control the playback of all others listening this VOD, etc? In short, using RTSP and multicast at the same time appears weird to me ans raise questions.

2 - I think either real UDP with muticast or unicast RTSP have more meanings. But if it is a spec of yous codec devices...

3 - You can have a look at those log on the GUI (menu item called Messages) or adding parameter "-vvv" to the command line (to get debug outputs, many outputs). "vlc -H" can give you other parameter(s) to get this output sotored in a file.

regards,
Anthony

I am trying to point my VLC at a videostream from a hardware CODEC. The CODEC is set up to issue a multicast rtsp stream on IP 224.0.0.1, port 50000. The VLC client and the codecs are all on the same subnet and connected to a switch which is able to deal with multicast data.

To connect to this am trying:

vlc rtsp://@224.0.0.1:50000

There is no such thing as multicast RTSP stream. Either this is a plain RTP multicast stream: , or it's RTP multicast stream with an RTSP rendez-vous point URL: P.S.: 224.0.0.1 MUST NOT be used for streaming, unless you want to destroy your network. This group is for IGMP only.

Thanks - the codec ceratinly states it has an RTSP multicast - I had better ask them about it!

You state I should not use 224.0.0.1, but isn't the multicast range from 224.0.0.0 to 239.255.255.255? Surely I have to set the multicas to stream somewhere within this range...

Chers,

Ben

224.0.0.1 is reserved. See IANA for the whole list of reserved groups.

Ah yes - I found what I needed here:

http://www.iana.org/assignments/multicast-addresses

However, we are testing on an isolated LAN, so should be able to use any address we like in the range

Incorrect. A router for instance will use 224.0.0.1 (including NAT traversal systems). The range 224.0.* should always be avoided at all cost.