We need send h264 from flash to Wowza and after to vlc by RTSP protocol. But if we send sound in Speex codec, we not listens sound. what it is possible to make?
You can use the Transcoder AddOn for Wowza to convert the Speex audio on the fly to AAC or MP3. http://www.wowza.com/addons/wowza-transcoder-addon
Here's how we configured our video recording product to leave the H.264 video data intact and transcode the sound from Speex to AAC so that a proper MP4 file that can be played on iOS/Android is obtained: http://nusofthq.com/blog/recording-mp4-filesh-264-and-aac-with-hdfvr-and-wowza/