Multicast streaming on wireless

Hi all,
I want to start streaming multicast video across wireless. Lucky for me, the stream isn't of too high bandwidth (100-200 kbps). However, it is multicast based so: UDP packet streaming, no ACK mechanisme.
Our setup is completely WISM based.
However, i have done some tests in the lab streaming 50 pkts/seconds to my wireless PC (connected in 54mbps g, excellent signal quality) and i get about 13% packet drops. Much too high drop rate for video streaming.
What methods are available to decrease this drop rate on wireless ?
Any docs will help,
regards,
Geert

After doing some more research about EDCF and WMM (QOS things to improve voice over wireless), i am trying to set this up for the multicast streaming.
However, in the Unified Wireless Multicast Design guide, i see "The QOS bits of the LWAPP multicast packet are hard coded at the lowest level and are not user changeable". And indeed, i have done a sniffer capture of a multicast stream: it enters the controller with DSCP EF, however the LWAPP encapsulated packets to the LWAPP distribution group have DSCP 0.
According to the QOS Voice design guide, the DSCP marking of the original packet is transferred into LWAPP packet and from their on the 802.11.
Does this mean that the whole EDCF and WMM stuff to improve QOS on wireless, doesn't effect the multicast stream ? So with real multicast, i am stuck with QOS = 0 ??

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How to publish a p2p/multicast stream

Hello,
Suppose I have a RTMP server (wowza) which strems this : rtmp://192.168.0.10/live, and the stream name is my.stream
The question is : which tool should I use to publish this stream to FMS using p2p/multicast mode ? So the output will be something like this :
rtmp://192.168.0.20/multicast/livestream1?fms.multicast.type=1&fms.multicast.groupspec=G%3 A01012105a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3010c160e666d732e6 d756c7469636173742e6578616d706c65210edde11d4d04c2a1b0d5514c19861fde3854dbd2fb012ae1bff6363 8fa3f334242011b00070ae00000fe75300415313233&fms.multicast.address=224.0.0.254%3A30000
I tried (using ffmpeg from xuggler) something like this :
/opt/xuggler/bin/ffmpeg -i "rtmp://192.168.0.10/live/my.stream" -acodec copy -vcodec copy -f flv "rtmp://192.168.0.20/multicast/livestream1?fms.multicast.type=1&fms.multicast.groupspec=G %3A01012105a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3010c160e666d732 e6d756c7469636173742e6578616d706c65210edde11d4d04c2a1b0d5514c19861fde3854dbd2fb012ae1bff63 638fa3f334242011b00070ae00000fe75300415313233&fms.multicast.address=224.0.0.254%3A30000"
But it didn't worked
Can somebody help me ?

Probably I haven't clearly understood your use-case, but looking at your question, I feel that you already have ts fragments and m3u8 file with you, that you want to serve to clients, and a simple Apache web server can do this task pretty easily (HTTP PUT from your encoder and HTTP GET from yuor clients).
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Wired stream: yes; wireless stream: no

I'll start by saying that I have read through the forum, the tips and troubleshooting, and other areas and couldn't find the specific answer I was looking for. However, if this is a duplicate, I apologize!
I have an Apple TV along with three Macs: a MacPro, a MacBook, and an iMac 20" Core2 Duo. The Apple TV is on the local network wirelessly and syncing with the MacPro which is wired into the network router/switch (Linksys N-router set to only allow G and N). No problems syncing with the MacPro and streaming from the MacPro. Everything is great.
In another room, I have the iMac which is connected to the same central router wirelessly. The connection speed is verified to be N and 130 Mbit. However, when I generate a code to connect this second computer to the Apple TV, the iMac does NOT ever see it. All settings in iTunes (current version) are set correctly for sharing, seeing Apple TV, etc.
As a test, I ran a 50 foot Ethernet cable from the iMac to the central router and, suddenly, I can see the Apple TV and stream from it to the TV. When I switch back to wireless, the Apple TV canNOT reconnect to the iMac. In other words, all the settings were correct because everything works fine with the wired Ethernet. The only change from one to the other is moving from wired to wireless. Everything then disappears.
What am I missing here? I would think that if the Apple TV didn't stream from other computers on the same wireless network, I would have found many people complaining about this or a tech article about it. There's got to be something obvious that I'm missing here but, for the life of me, I cannot find it.
Note that the same problem occurs if I try to stream from my MacBook or a Windows PC running the latest iTunes and wireless connected to the network (which I'm not really interested in doing because I don't keep any music on my MacBook or that Windows PC).
Many Different Macs Mac OS X (10.4.9) Loyal Mac user since the SE/30

Ken,
When you connect the ethernet cable to your Mac you are essentially bridging the wireless connection from the AppleTV and often eliminating: firewalls, encryption, authentication, and other settings for the wireless (radio) segment of your network.
The AppleTV is connected wirelessly to your router fine (you can easily test other connections from it w/ the iTunes previews). The Mac Pro is using the wired segment so it doesn't deal with the encryption and authentication methods used on the wireless segment. The MacBook (depending on model) may only be capable of G and there may be a hardware driver issue with the different Atheros models and the Broadcom chipsets. I've seen it happen w/ some N gear and not others (won't bore you w/ the details).
I have no problems streaming from different PCs and Macs wirelessly using different router combinations, provided you have adequate signal strength and connectivity you should be able to stream between machines and to the AppleTV wirelessly. It's worth testing bonjour/rendezvous and iTunes streaming between machines in addition to your working filesharing.
Try the following:
1) Turn off your network appliances and restart them from the gateway up.
2) Set the security mode on your router to the highest level possible (radio)
2b) Lower the security mode on your router (radio)
-this will give you as much control over hardware incompatibilities that you can have short of changing the 802.11 compatibility mode.
3) Check the firewall settings on your iMac and on your other machines.
4) Check the firewall settings on your router.
-in the iTunes never sees AppleTV thread Jeffrey Lee states open 3689
5) Test streaming from iTunes on one machine wirelessly to another.
6) See jappl's solution (change channel of wireless in this case from 11 to 3)
I suspect you have a port issue where the numerical authentication is unable to pass through a firewall for your wireless devices. You may have a driver issue and that can often be remedied with the steps above.
A further thing to check is your router firmware. With N routers it's a good idea to upgrade the firmware for compatibility, but you always run the risk of bricking the router so people tend to be lazy and avoid performing such a task. If you can't get streaming to work between machines and try everything above look for a firmware update. Afterall, if your router doesn't do what you need it to do then bricking it with a firmware update won't put you out of business.
What happens if you plug the ethernet cable into your iMac, then share the airport connection from your iMac using the sharing tab?
Also, try giving your AppleTV and iMac IP's that are outside the assigned pool range (ex: if distributing 10.0.1.2 - 10.0.1.201, try 10.0.1.202). Your router may let you assign directly, which is often better. Check your machine names and change them to short lowercase names w/ no spaces or symbols.
Good Luck,
-j

Multicast streaming on wireless

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