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Outreach I.T.
Outreach I.T.
Participant
August 25, 2009
Question

fms 3.5.2 - video/audio streaming application - audio stops or lags behind

  • August 25, 2009
  • 2 replies
  • 6138 views

Yesterday, 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.

Any thoughts on what might have gone wrong?

Phil

    This topic has been closed for replies.

    2 replies

    Outreach I.T.
    Outreach I.T.Author
    Participant
    September 4, 2009

    Since, I see other people viewing this I will update the status.

    I am still having trouble with audio and video lagging up to 5 to 10 seconds from the live feed and jerky video quality.

    BUT by changing the Application.XML so that the Process>Distribute>numprocs equals "1" instead of the default of "3" seems to make the delay time more consistant between clients.

    At this point I would have to say that FMS is great for VOD applications but not so good for LIVE interactive apps?

    R
    rexdtripod
    Known Participant
    September 18, 2009

    I'd have to concur at this point.  Doing the same thing here.  FMLE 3.0 streaming to FMS 3.5, good machines, and a  T1 between them.  With just one client (me) audio is lagging behind video by anywhere from 5 seconds using VP6 to 20-30 seconds with H.264.  I'm not sure if I'm missing something really obvious or if this is actually how it performs.  Have to do more digging.

    A
    Anonymous
    September 19, 2009

    Have you tried combining audio samples?

    http://help.adobe.com/en_US/FlashMediaServer/3.5_AdminGuide/WS5b3ccc516d4fbf351e63e3d119f2925e64-7ff0.html#WS5b3ccc516d4fbf351e63e3d119f2925e64-7fea

    Jody

    Outreach I.T.
    Outreach I.T.Author
    Participant
    August 26, 2009

    Perhaps some further information might spur some replies.

    I started with a fresh application folder and customized the ASC, and application.XML.

    The stream that is having the audio lag / video freeze issue is created by a server side function that creates a new STREAM and attaches a published stream from a client or FMLE to the applicaiton.

    In testing the application with up to 4 clients I have had no problem with connectivity, audio lag or video freeze ups even if I ran the application for several hours.

    So, I guess my main question is how does this symptom relate to the number of clients?

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