Media Server :: Video And Audio Out Of Sync When Recording With FMS
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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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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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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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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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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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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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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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 5, 2011
I am developing (well, trying to anyway) a service where a member can record themselves on our website using their webcam. We need to be able to record that entire webcam session they had on our website for judges to determine whether they've cheated or not (it's a competition-based service). But, I can find no documentation, articles or even a sign that this is possible (other than knowing I've seen it in use many times). And I'm not sure what kind of hosting would be most appropriate for this type of service, and what steps would be required for me to get started on this.
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Mar 30, 2010
I want to have a website where users can record short video clips (using a webcam) and then have those videos saved on the FMS for viewing later. I've seen a lot about streaming video, but I actually want to save the video.
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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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Mar 30, 2010
I have purchased flash media server and I'm looking for a way to have people record video off their webcams and have it saved to the FMS. How to do this?
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May 7, 2009
I am using FMS 3.5 and Flash CS3 (though using action script 2 at the mo)What I have is a simple program that records a webcam and saves the result as an FLV. - Note, I am doing all this locally, NOT over the internet or a local server. FMS is on the same PC as the program.
1) The frames per second does not seem to be fixing to 25fps, but instead seems to be around 15fps depending upon which pc I use. I'm using: cam.setMode( 320, 240, 25 ); to set the size and frame rate in flash.
2) When I get the properties for the resulting flv, it says it is using h.263 codec. Is there a way to change the codec that is used (to say h.264)? Or is this dependent on the version of flash used? ie. would creating it in flash 9 using AS3 give a better quality result?
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Aug 16, 2010
This is important since if it's growing too fast there won't be enough space.
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Jul 16, 2009
I'm very new to FMS and I have been experimenting around with it as a part of my job. I already have the encoder, FMS, and my AIR application all talking, so that portion is going well.The problem that I want to tackle next though is to have the FMS server record the live stream to it's hard drive. All of the guides that I've found talk about how to make a DVR stream, but that's not what I want. I want to be able to have the live stream, and then separately I would like to have it recorded.
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Jan 14, 2010
i'm developing a web site, and i'm trying to let the user record some video from his webcam. I'm using actionscript and flash media server. I got it work in my delevoper enviroment, but when i deployed it to the production server, the webcam can't get connected to the FMS. I'm afraid this is because of port blocking from the firewall. Does anyone knows wich ports are userd for recording from a browser by the Flash Media Server? I open the 1935 port in the Flas Media Server, but it still doesn't work.
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Nov 2, 2010
I am developing a web application. where user can record video, audio and can take photos.
The recording is working fine. but only upto 70% of video is recording. How can I know the video progress?
Is it possible to show a progress bar both on recording and preview video?
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Apr 17, 2011
I'm creating application where user can record voice message, problem is that recorded file is passed to other encoding servers, that requires both video and audio streams to be present.
how can I use static image to emulate webcam and attach it to NetStream?
ns = new NetStream(nc);
ns.addEventListener(NetStatusEvent.NET_STATUS, watchRecording);
//ns.attachCamera(cam);
ns.attachAudio(mic);
ns.publish(fileName.text, "record");
[+]
Although I don't have access to application on WOWZA server I can negotiate with some one to add few lines and recompile it. So server-side solution in java is also an option here.
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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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Jun 16, 2010
I'm currently working on a webcam recorder to record high quality video. I had the recorder working before, but the video quality was quite poor. Instead I'm trying to use a client side buffer and then upload the buffer after recording has stopped. I thought after I unattached the video and audio from the NetStream that either a NetStream.Buffer.Empty or NetStream.Record.Stop event would be sent when the buffer was finished uploading.
What is actually happening after I start recording is two NetStream.Record.Stop events are being sent in a row, so recording never really happens. Also, on the server side I'm trying to save a user name and password into a variable, but I'm not sure how to go about doing that since the application script is just a bunch of callback functions.
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Jul 26, 2010
I've had FMS running on my local machine for a while and have had a little experience writing FMS apps, but I've just tried recording audio for the first time using the standard vod application and I keep getting a "Write access denied for stream" error. My AS3 code is copied and pasted for various examples and am confident that it works.
I'm running Windows XP service pack 3 & FMIS 3.5.
I've had a look at the vod/media directory and under windows->properties the read-only attribute is ticked. Every time I un-tick this it reverts back to being ticked. I've googled this and MS say that most programs ignore the read-only attribute and that it only really applied to files. I've also tried the MS fix for setting the read-only attribute via cmd and still no joy (doesn't fix read-only attribute or FMS recording the audio after setting via cmd).
I've also tried our dev server install of FMS (running under linux) and am getting the same results.
Here's my AS3 code...
private function initApp(event:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE,initApp);
[Code].....
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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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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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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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Dec 7, 2009
When I use the webcam and microsoft to record a video, my audio and video are out of sync.This does not happens when I use the built-in Microphone on the webcam.
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Jun 13, 2009
I'm trying to implement a flex app that will be able to record a video from a webcam and then upload it to a server. I've only found tutorials and examples that require a media server running such as Red5, Flash Media Server and Wowza and an open rtmp stream to the server. However, I want to know if it's possible to record a video locally and then submit it to the server with a simple HTTP request. Is there a tutorial somewhere that shows how to do this? I'm really new in flex development
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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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