Flash media Server, Live Video Mic Echo when using a Apple Cinema Display

Question

I'm using Flash Media Server to create a 1:1 video chat. The problem I'm having is that when I use my apple cinema display I get horrible Echoing, even with the reduce echo box checked. If I don't use my cinema everything works fine with the built in macbook mic.

Any idea what's going on and how I can fix this?

I have to believe there is a setting as I can use iChat, Adobe Connect, WebEx, Skype all with my apple cinema and not have this MIC echoing issue.

Thank you

OUR CURRENT SETTINGS:

AUDIO

var options:MicrophoneEnhancedOptions = new MicrophoneEnhancedOptions();
     options.mode = MicrophoneEnhancedMode.FULL_DUPLEX;
     options.echoPath = 256;
     options.nonLinearProcessing = true;
     //options.autoGain = false;

     microphone = Microphone.getEnhancedMicrophone();
     microphone.codec = SoundCodec.SPEEX;
     microphone.framesPerPacket = 1;
     microphone.setSilenceLevel(0, 2000);
     microphone.setUseEchoSuppression(true);
     microphone.encodeQuality = 3;        // decrease quality slightly from default (6) to conserve bandwidth 
     microphone.gain = 85;

VIDEO

camera = Camera.getCamera();
     // 2k bytes (or ~16kbps) of bandwidth
     //camera.setQuality( 16384 / 4, 0 );
     camera.setMode(320, 240, 12, false);
     camera.setQuality(18432, 0);
     camera.setLoopback(false); // show local cam before encoding, not after
     camera.setKeyFrameInterval(48); // keyframe interval is at maximum so that we transmit less data
var h264Settings:H264VideoStreamSettings = new H264VideoStreamSettings();
     h264Settings.setProfileLevel(H264Profile.BASELINE, H264Level.LEVEL_1_2);
     ns.videoStreamSettings = h264Settings;

Hi All, really hoping to hear some advice on this topic. I added our current settings to the Q. What do you think? — AnApprentice, Dec 23 '11 at 19:49

Aquahawk · Answer 1 · 2011-12-18T08:59:11.077

4

It's because default flash microphone has no echo suppression. You need to tune it programmatically. According to reference you need to use setUseEchoSuppression() You can change some params using enhancedOptions For examples you can read Jozsef Vass great article

It is not a Mac problem, such behavior appears on PC with Windows and Linux too.

edited Dec 18 '11 at 08:59

answered Dec 18 '11 at 08:49

Aquahawk

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Thanks but this isn't solving it for us yet. Sadly! ... I updated the question with our settings. ANy suggestions or red flags you're seeing? Right now video quality is nice but there is a lag, and audio is horrible, delayed and choppy, and garbled. – AnApprentice Dec 23 '11 at 19:48
Also added audio and video settings. Both are now there. Thoughts? – AnApprentice Dec 23 '11 at 19:51

score 1 · Answer 2 · answered Mar 15 '13 at 20:38

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The echoing is still there since you haven't assigned the "MicrophoneEnhancedOptions" to your microphone device.

Add this code to your existing specified lines.

microphone.enhancedOptions = options;

answered Mar 15 '13 at 20:38

Shankar Narayana Damodaran

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score 0 · Answer 3 · answered Dec 17 '11 at 23:34

0

If you are sending MP3, try using AIFF audio format: Discussion on Apple.com

Or maybe upgrade the firmware, if you haven't: MacRumors post.

answered Dec 17 '11 at 23:34

iND

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Flash media Server, Live Video Mic Echo when using a Apple Cinema Display

3 Answers3