# Receiving multicast feed

**URL:** <https://community.wowza.com/t/receiving-multicast-feed/46705>\
**Category:** Wowza Streaming Engine\
**Created:** [March 10, 2016, 3:52pm UTC](https://community.wowza.com/t/receiving-multicast-feed/46705 "2016-03-10T15:52:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Adrien\_Jacquot](https://avatars.discourse-cdn.com/v4/letter/a/c4cdca/32.png) [@Adrien\_Jacquot](https://community.wowza.com/u/Adrien_Jacquot)\
**Post date:** [March 10, 2016, 3:52pm UTC](https://community.wowza.com/t/receiving-multicast-feed/46705/1 "2016-03-10T15:52:06Z")

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Hi,

We’ve sat up Wowza Streaming Engine (4.3.0) to receive multicast feeds from live CCTV cameras, using their .sdp files (i’ve attached one example below).

However there is a strange behavior with the feeds, where we need to connect to the cameras in parallel using VLC (using the same .sdp files).

Indeed if we don’t launch VLC, it seems like the subscription to the multicast feed is not “activated”, hence Wowza won’t receive any data.

Hope this makes sense.

Thank you,

Adrien Jacquot

.sdp file for a SONY CS50P

v=0

c=IN IP4 239.243.200.136/254

a=source-filter: incl IN IP4 239.243.200.136 10.243.200.136

m=video 5008 RTP/AVP 96

a=rtpmap:96 MP4V-ES/90000

a=fmtp:105 packetization-mode=1; profile-level-id=274d60; sprop-parameter-sets=Z01gKI1oBQAgbAWyAAAH0gAA6mDagA+gAHJ173UPFCKg,KO4ESSAAAA==

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**Author:** ![SiggDev](https://avatars.discourse-cdn.com/v4/letter/s/dec6dc/32.png) [@SiggDev](https://community.wowza.com/u/SiggDev)\
**Post date:** [March 11, 2016, 11:29am UTC](https://community.wowza.com/t/receiving-multicast-feed/46705/2 "2016-03-11T11:29:30Z")

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Did you connect to this stream (Server/Stream Files/Connect to) first? Alternatively, you can add this sdp file to the Startup streams (same section).

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**Author:** ![SiggDev](https://avatars.discourse-cdn.com/v4/letter/s/dec6dc/32.png) [@SiggDev](https://community.wowza.com/u/SiggDev)\
**Post date:** [March 12, 2016, 11:42am UTC](https://community.wowza.com/t/receiving-multicast-feed/46705/3 "2016-03-12T11:42:52Z")

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You mentioned running vlc - do you run it on the same machine where wowza is installed?

Do you have more than one network interface on this machine? If so, take a look at this guide: [https://www.wowza.com/docs/how-to-listen-for-a-multicast-stream-on-a-particular-network-interface](https://www.wowza.com/docs/how-to-listen-for-a-multicast-stream-on-a-particular-network-interface)

Also, try changing RTPTransportMode in appropriate application.xml to udp instead of interleave.

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**Author:** ![Adrien\_Jacquot](https://avatars.discourse-cdn.com/v4/letter/a/c4cdca/32.png) [@Adrien\_Jacquot](https://community.wowza.com/u/Adrien_Jacquot)\
**Post date:** [March 11, 2016, 1:17pm UTC](https://community.wowza.com/t/receiving-multicast-feed/46705/4 "2016-03-11T13:17:34Z")

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Hi SiggDev, thank you for your reply.

All streams were indeed connected