Hi Sebastian,
I have managed to set up a test environment where I can use the "test-setup.lzx.swf11.swf" application and verify that selecting "useEchoSuppression" and "use Enhanced Microphone" options really does make a great difference in reducing echo. Yes, this works just great ! How difficult is it to introduce into the current OpenMeetings build? It would be worthwhile if you could. I have one laptop in particular that is good for causing echo, as it has no internal hardware echo cancellation features. After setting up an OpenMeetings test server, I then used this laptop to run test-setup.lzx.swf11.swf and below are the steps that I used to verify the effectiveness of this echo test; 1) Test 1 - Open Internet Explorer and connect to test-setup.lzx.swf11.swf on my OpenMeetings server 2) In the "URL:" field, change 127.0.0.1 to the IP address of my OpenMeetings server 3) Leave "useEchoSuppression" and "Use Enhanced Microphone" enabled 4) Right click the test window to bring up Adobe Flash Player's menu, select "Settings...", and ensure that "Reduce Echo" is selected in the microphone tab. 5) Connect by selecting "connectRtmpConnection" 6) Select "startBroadCast" to start broadcasting my video and sound 7) Now on the same PC, I select "playBroadCast" to start receiving my broadcasted my video and sound 8) There is a short delay between my speaking and hearing myself via the speakers in the laptop. 9) I adjust the volume on the speakers so that the play back of my voice is loud and clear, almost to the point where the sound is being picked up by the laptop's inbuilt microphone and is producing a delayed echo. 10) Now that all is working well, and I can see my video and hear my voice, I stop playback, and stop broadcasting, and close the web browser. 11) Test 2 - Open Internet Explorer and connect to test-setup.lzx.swf11.swf on my OpenMeetings server 12) In the "URL:" field, change 127.0.0.1 to the IP address of my OpenMeetings server 13) I uncheck "useEchoSuppression" and uncheck "Use Enhanced Microphone" enabled 14) Right click the test window to bring up Adobe Flash Player's menu, select "Settings...", and ensure that "Reduce Echo" is still selected in the microphone tab. 15) Connect by selecting "connectRtmpConnection" 16) Select "startBroadCast" to start broadcasting my video and sound 17) Now on the same PC, I select "playBroadCast" to start receiving my broadcasted my video and sound 18) As soon as I select "playBroadCast", the most dreadful squealing echo starts up, and when I speak there is echo of my speech. 19) If I turn the volume right down to where the audio is almost unheard, the squealing echo stops. But as soon as I try to turn the volume up where it is useful, the echo returns. Test 1- No echo when Echo Suppression is enabled. Test 2 - Background echo is a major issue when Echo Suppression is not activated. Thanks, George Kirkham IT Manager Cooperative Research Centre For Greenhouse Gas Technologies (CO2CRC) NFF House, 14 - 16 Brisbane Avenue, Barton, ACT, 2600, Australia T: (02) 6120 1600 F: (02) 6273 7181 E: gkirk...@co2crc.com.au, W: www.co2crc.com.au From: seba.wag...@gmail.com [mailto:seba.wag...@gmail.com] Sent: Saturday, 13 October 2012 11:46 PM To: George Kirkham; Joseph Karwat Cc: openmeetings-...@incubator.apache.org; openmeetings-user@incubator.apache.org Subject: Testing application to compare Acoustic Echo Cancellation (AEC) in SWF11 in OpenMeetings Hi George/Joseph, I have build a Cam/Mic testing application where you can compare the settings between AEC and not having AEC in OpenMeetings. I could not find any difference, however I also have quite good headsets and a good microphone with build in echo cancellation on MacBookPro. Please see this description on howto install/test AEC feature with the testing application: https://cwiki.apache.org/confluence/display/OPENMEETINGS/Camera+Micro+Te sting+Application+Standalone Basically you simply copy: https://svn.apache.org/repos/asf/incubator/openmeetings/trunk/singleweba pp/WebContent/src/test/test-setup.lzx.swf11.swf To: $RED5_HOME/webapps/openmeetings/ a) Then navigate with your browser to: http://localhost:5080/openmeetings/test-setup.lzx.swf11.swf b) Input IP/Host on the top => click connect c) Choose streamname to broadcast => share Open a second browser on another machine: a) navigate with your browser to to the same app. b) Input IP/Host on the top => click connect c) Choose streamname to play (Has to MATCH the one in the broadcast of course!) => play This works of course also vice-versa. So you can make a simple 1:1 chat. To change settings it is best to press F5 and reload the browser and reconnect. Sebastian -- Sebastian Wagner https://twitter.com/#!/dead_lock <https://twitter.com/#%21/dead_lock> http://www.webbase-design.de <http://www.webbase-design.de> http://www.wagner-sebastian.com <http://www.wagner-sebastian.com> seba.wag...@gmail.com <mailto:seba.wag...@gmail.com>
