NetStream play H264/AAC flv no sound

Question

I used Flash builder 4.5 created a player to play recorded video from Adobe Media Server.
Until now, mp4 is worked perfect. But now when mp4 transfer to flv, my player played the video but no sound.
If this video transfer to H264/MP3, it will work perfect.
I used AMS sample player to player the video and it worked perfect. Where is my pleyer wrong?
Here is some code:
ns:NetStream = new NetStream(nc);
ns.addEventListener(NetStatusEvent.NET_STATUS, ns_status);
ns.client = nsClient;
video.attachNetStream(ns);
ns.bufferTime = 10;
ns.play(xxx/xxx);
And video info get from onMetadata:
audiocodecid: 10
audiodatarate: 15.625
width: 640
videodatarate: 976.5625
encoder: Lavf54.63.104
height: 368
framerate: 29.970029970029966
filesize: 87087101
duration: 687.488
audiosamplerate: 8000
audiosamplesize: 16
stereo: false
videocodecid: 2

Answer 1

have you set these values:
netstream.receiveAudio(true);
netstream.receiveVideo(true);