How to get live stream name

Dear all!
I use ffmepg to push a livestream to my flash media server. Then I want to catchup live stream to file.
/opt/ffmpeg-1.1.1/bin/ffmpeg -i udp://238.1.1.2:1234 -filter:v yadif -acodec libfaac -ac 2 -ar 44100 -b:a 96k -af volume=5 -b:v 1000k -c:v libx264 -preset fast -pix_fmt yuv420p -s 720x476 -r 25 -threads 0 -t 300 -f flv "rtmp://10.84.70.120/dvrcast_origin/vtv22"
After, I create an application that main.asc file is:
application.onConnect = function (){
        name = Stream.name();
        stream = Stream.get(name);
        if(stream){
        stream.record();
I can not catch live stream to file.
Can you show me how to get a live stream name?
Thanks!

The error only appeare when there is no stream name in output.
rtmp://10.84.70.120/dvrcast_origin/ --> error
rtmp://10.84.70.120/dvrcast_origin/vtv22 --> ok.
1. Could you re-try using the -ru option? for realtime publish?
2. Have you compiled the ffmpeg with rtmp libraries?
I can publish without error as the format above. So it is not problem.
3. Are you able to record the udp stream onto the disk? (to verify there are no problems with the input stream? --> I've test with input without FMS. It's ok.
4. Are there any error messages logged in FMS? (core logs/application logs)
There is no error log file in logs/ folder.
When I test with Flash media live encoder. I press "record" button. Everything is ok.
The problem only appeare when I put stream with ffmpeg .
Is there special anyconfig that effect it?

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Moderator message: four out of four threads locked, please read and understand the following before posting further:
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