Media Server :: Reduce Audio And Video Latency In Flash?
Sep 22, 2010
We have one functionality in which one user can communicate with the other user at the same time through flash media server3.5. In this fucnitonality we are catching stream from both end through camera and pass it to flash media server. On FMS side this streams gets stored also we are displaying those recorded flv files side by side to the corresponding user so that they can communicate with each other. In this situation we are facing a video and audio latency upto 1.5 to 2 sec.
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Dec 9, 2010
I've build a live video/audio chat application. All works fine only the issue is latency of 5 secs. I'm using FMS 3.5 and FLEX.
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Oct 21, 2010
I can't find the setttings for have a least latency as possible, either the video quality is bad or the latency is up than 5 secondes...What should i do?
[Code]...
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Sep 8, 2009
iam streaming my web cam to FMS .... i have got a latency of 1 -2 second,,,,,, What should i do to reduce the latency,,,,,, is ter any change i can make in FMS files(xml files) in order to reduce the latency......
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Feb 15, 2011
I am developing Video Chat over Ip (including audio and text too). But I am unable to get the proper startup material for my desktop application.
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Jun 3, 2010
I'v made an application with all the default codec and settings provided by adobe to publish live video using FMS. I've made two swfs one is for publishing live video and the other is for viewing the published stream (telecast). When I'm publishing the live video on My laptop using the default web Cam and mic attached to the Dell laptop then after 2- 3 minutes delay on the telecast side start increasing and it keep on increasing continuously .At the same time when I use my desktop PC by attaching external Web Cam and mic to publish, delay on my Telecast side is consistent ,it never increase. I found the problem is with the Laptop's mic. Can anybody please suggest me why it is happening, and is there any solution to it.
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Jul 22, 2010
I'm trying to make a software which sends video and audio data to a flash media server by using RTMP protocol. Currently, my program can communicate with a flash media server correctly. RTMP specifications does not describe about the raw data in video/audio messages, so I muxed raw H.264 and AAC data into video/audio messages and sent to the server. The server seems to accept them, but a video player cannot playback the stream sending from the server. The player just says "Loading..." For a test purpose, I sniffed the network packets between Wirecast and the flash media server and ripped off only video and audio data. Then, I muxed those data into video/audio message and sent to the flash media server. In this case, the video player connected to the server can playback the stream correctly.
I checked the stream sent from Wirecast, the stream seems not to be H.264 raw data because those data are not started from 0x17 instead of H.264 start code. With those situation, I am wondering what kind of container format I should use for H.264/AAC data to the flash media server.
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May 25, 2009
As titled, what is the way to record video/audio files using Flash Meida Server through rmtp, and allow users to access the recorded files through http?What I am trying to do, is to record a user's microphone's input and save it to the server.fterwards, I would like other users to be able to access the recorded files and mainuplating the audio data, by computeSpectrum(), to do some visualization of the audio. As I know computeSpectrum() cannot work on streaming files, so I think I need to access the recorded files using http instead of rmtp. Is that true?
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Jul 22, 2011
We are using the FMS4 for 1-1 real time video chatting. it is fine but the CPU usage are very high.[url]...
we use the :80 I guess it helps to deal with the firewall with HTTP tunneling? (seems if it is true, it will this degrade performance?)
with 320*240; it is using 30~50 % CPU; with 480*360: 40-60% CPU at the clients. so high... decent client machine: Intel i5 650. Quad 3.3Ghz 8G RAM. win7 64
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Aug 25, 2009
I ran a simple live video streaming application for the first time with actual users and ran into a couple of serious performance issues that had not turned up during testing. In this instance there was one video stream from a live web cam and used FMLE at 150 kbps using VP6 and MP3 @22k. There were 16 clients and everything worked pretty good for about 30 minutes. (although some clients said their audio and video were out of sync by up to 3 seconds)
Then individual clients would have either the video freeze or the video would continue and the audio would stop. These clints had to "disconnect" and then "connect" again to the application. This happened to all of the clients at one time or another for several minutes. I stopped and restarted the FMLE with progessively lower bandwidth settings down to 75 kbps but still clients were having the same issue.
I eventually stopped the FMLE and used the applications built in publisher at 45 kbps and that seemed to eliminate the freeze/dropping issue. But of course the video quality was very poor and some clients still reported that the audio was out of sync with the video. The server hosting the FMS application is a quad processor dell with lots of memory and network connectivity. The Flash Media Admin Console performance graph showed the total Bandwidth as 3 Mbps at maximum.
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Aug 21, 2006
Task is to take online interviews and record them for lather reviewing. I m new to media server and video streaming.
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Apr 15, 2009
I want to set the bit rate of audio and video (48,96.128 kbps) at the time of live streaming . i m not using the flash media live encoder because i have to make it as web applicaton. can any one tell me how to set bit rate.
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Aug 18, 2009
We use a Flash component to allow a user on our web site to record from a Webcam on to our own Flash Media Server. The problem we are having is that the video in a 30 second FLV freezes at the 7th second but the audio continues. The video unfreezes after a couple of seconds but never catches up with the audio. At the very end there's a "Fast-forwarding" of video for the last few seconds so that at literally the last moment, everything's in sync. This happens for almost all of our recordings. Has anyone experienced this type of behavior?
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Nov 20, 2009
We have the Flash Media Interactive Serve 3.5. Is there an automated way to strip the audio from video files and stream on FMIS? .
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Oct 12, 2010
I have been running FMIS 3.5 since April of this year. In August, we started recording conferences, but I'm not sure that this is the issue. We are under very low load at the moment. We never have more than one conference going simultaneously. Our server is spec'ed with a 64-bit operating system (MS08), 24GB RAM, and 24 processors.I notice that in some of our conferences, the video and audio freezes for 5 to 10 seconds. Then they recover and resume where they left off. When this occurs, it recurs every one or two minutes, which is very disruptive.People have to constantly repeat themselves.
FMIS is configured with defaults out of the box, with the exception that we are recording live video and audio. How do I solve a problem like this? Is it Internet latency? Is it our internal network? Is it FMIS 3.5? Not sure where to start.Now I've inherited much of the Flex 3 code that is used in the stream and player Flash components. I notice in the player component that the original programmer is using a timer to monitor the mx.Event.VideoEvent.STATE_CHANGED event. As long as the event fires, he resets the timer. But if 10 seconds expires and the STATE_CHANGED event has not fired, he restarts the player. Is this a valid methodology? Here is the code fragment.
<mx:Script><![CDATA[var lastUpdate : Number = 0;private var pulse : Timer = null;
private function onInit() : void {
viewVideo.addEventListener(VideoEvent.STATE_CHANGE, function() : void { if (!lastUpdate) { pulse.start(); }[code]....
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Oct 15, 2010
I'm currently able to record audio and video (from a webcam) to a Flash Media Server. However, in some cases users have a webcam with no builtin
microphone. In that case the flash client uses the default microphone with 'Microphone.getMicrophone();' and possibly selects the micrphone of the PC.
A delay between audio and video is caused in cases with a separated webcam and microphone. There isn't a lot of delay on an internal network (e.g. LAN) however, there is a very large delay between audio and video on an external network (e.g. WAN).
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Nov 24, 2010
I've a site where consumer can take a live meeting with the beauty consultant. The problem I'm facing is during the video chat. Basically there is a delay of 5 seconds between Video and Audio when I access the site from out of my network but when I access it within my network (VPN) then it's work fine.
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Apr 14, 2011
Is it possible to dedicate separate bandwidth for both audio and video during for example video chat?
Basically my end goal is to give a minimum bandwidth to audio (so it has a minimum quality, at least), then the video will use the rest
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Apr 28, 2011
I'm creating a video chat application, and no matter what combination of Camera/Microphone/NetStream properties and functions I use, I cannot get high quality video/audio. I get occasional audio latency, pixelated video, occasional frozen video and the degree of each depends on the combination of properties/functions I set/call.
Others such as TokBox, TinyChat, Chat Roulette, etc. have achieved great video/audio quality with FMS, what is the secret? At least point me in the right direction, because right now I'm not impressed with FMS ability to provide a good video/audio experience. BTW, I'm using a P2P mesh using a group specifier, not NetStream.DIRECT_CONNECTIONS.
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Sep 29, 2009
Is a latency of 94 - 109 high or low....if its high how do I lower it via the client I don't have control over the server at this point in time.
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Oct 27, 2009
I'm new to Flash media server family. I need a server that can capture user recorded video/audio (through a flash recorder) and save it as a flv file on the server. which one of those server family is for me? I'm currently doing it using Red5, but would like to try out Flash media server as well.
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May 17, 2010
We are using FMS3.5 for VOD streaming. It's spotted that when we are using Flash Player Version = WIN 10.0.42.34/10,0,45,2, it is encountered that the video picture is hang but audio keeps playing after our commercial break point. we will first pause the video content and then use the same object to play the instream ad. After that, the video is resume when instream ad complete.
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Sep 12, 2010
I have this sample code from the e-book: "Learning Flash Media Server 3". The purpose of the code is to create a FLV. The code is not running as it should. When I click on the 'record' button, the label is to change to 'recording', that dosen't seem to happen and also when I click on the 'Stop Record' button, I get the following error:
"TypeError: Error #1009: Cannot access a property or method of a null object reference.at MinRecord/stopRecord()"
[Code]....
My deduction is that the 'if' statement in the 'startRecord' function is not resolving to 'true' and hence the label is not changing to 'Recording'. Also I feel that the assingment to the variable 'ns' of type NetStream is not being done and hence in the function 'stopRecord' I get the above mentioned error message when I click on the stop button. How do I rectify these problems?
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Jan 21, 2011
I'm trying to record a stream from a webcam using FMS4 developer edition. The streams are recording on a linux box in .flv files. These files though have problems.
1 - The video quality is terrible. Fuzzy/blocky. Any kind of motion looks awful. Is there any way to improve this?
2 - The sound jumps/skips and goes out of time with the video.
As it is now this is useless. I am trying to make a system where a user records a short video from the camera and then I upload it to YouTube from my server. If you use Youtube's webcam page the video quality is quite acceptable and the audio is obviously in sync too, so they must know something I don't. [URL]..
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Apr 20, 2011
I have read in FMIS 4 "new features" that "absolute timecode" allows to switch audio tracks while playing a video (managing synch). Is there any exemple showing how to use this funtionnality (server config, flash player action script exemple)?
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Jan 4, 2012
I did a live stream last week using 282,482,832,1500Kbps streams. What would cause the audio to get out of sync with the live video stream? I'm trying to determine if it was bandwidth related, cpu/memory issue on the FMIS 4.5 server, or an issue with encoding PC exceeding it's limits?
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Jul 14, 2010
I currently have two connections with two separate streams. They both hit the same fms 3.5 server. One connection transfers live audio and video. The other one is used for remote objects. Sometimes when viewing the audio and video stream with a slower internet connection, the stream for the shared objects disconnects. I think it is a bandwidth issue. Is there any way to set the priority of the streams? I think this should allow me to set a higher priority for the shared object connection so it won't disconnect.
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Feb 21, 2012
When concurrent users increases my a/v conent delivery to the client is very slow. or even drop. Feel breaks in the session. but when check my server rsourses, almost free. One more observation, when i liesten to the recorded stream everything seems to be fine like there is nothing oing bad in live session.
Is there somthing which is missing for concurrent users for FMS config file.
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Feb 26, 2010
i m using these setting
[Code]...
i am facing the problem of echo .i am speaking than i can also hera my voice . how to reduce that problem that user can not hear own voice .
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Apr 7, 2012
When synthesising sound using the SAMPLE_DATA event of the Sound class, the Flash documentation recommends writing out as many samples as possoible up to 8192. On my system the sound cuts out unless I write at least 4192 samples each event. That's a full tenth of a second, which is going to be user-noticeable.
I may have the option of buffering things up ahead of time, but this is a major annoyance for my application.Is there any way of getting lower latency audio output?
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