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O
OmicronPersei8
Participant
February 6, 2009
Question

Trying to find lowest latency setting for FMS 3.0 live streaming app

  • February 6, 2009
  • 1 reply
  • 1204 views
Hi,
I work for a technology company in the agricultural industry, and we recently bought Adobe FMS 3.0 for live streaming of an online auction application. Initially the tests were ok, but the stream latency is becoming a real issue. It starts at around 1s delay, which is barely acceptable, but an hour into the sale it stretches to 2-3s, and more. This is becoming a real deal breaker for the Flash solution that looked very promising at the beginning.

We need to find the absolute lowest latency setting for the live streaming application supplied with FMS3.0.
Low latency (1s max) and stable latency has highest priority, more important than picture quality or uninterrupted streaming.

How can we achieve this? Are there any settings where I can tweak the stream latency?

I am not a Flash expert, but I can find and modify the configuration files on the FMS Windows 2003 server.
Any help would be immensely appreciated.
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    1 reply

    A
    Anonymous
    February 6, 2009
    On server side:
    FMS installs itself with default configurations optimized for Max CPU efficiency. Reducing/shutting-off FMS publisher queues using Application.xml config should help in removing the delay that you experienced.

    <Application>
    <StreamManager>
    <Live>
    <Queue enabled="true">
    </Queue>
    </Live>
    </StreamManager>
    </Application>


    Changing default setting to <Queue enabled="false"> disables live publisher queues & aggregate messages ad therefore "the delay". (the delay should be reduced to <100 ms for a perfect kind of network or LAN)

    --> On client side: Do NOT use NetStream.setBufferTime API at all ! i.e. do not set any buffer on client side.; Flash player (upto 10, the current version) would try its best to keep the buffer around 0.1 seconds, which is the default value.



    -----------------
    OmicronPersei8,
    Which publisher are you using to publish the live stream? Sometimes , it is possible that a some fault at stream publisher may make buffer at flash player grow.


    I hope this would help !


    O
    OmicronPersei8Author
    Participant
    February 6, 2009
    Hi Pankaj,
    thanks for your reply, I will try the suggested server-side settings.
    Basically we just installed FMS 3.0 to an internet-exposed Windows 2003 server, and made sure we had enough bandwidth for the intended audience. Encoding is done from a local WinXP computer using FME2.5.
    The actual Flash object embedded into the viewers webpage came from a third party developer, but they also don't have much experience with Flash. We might have started this a little bit on the naive side, but the examples provided with the FMS developer version made things seem to be really simple, and Flash would be the best solution regarding installed use base.
    Would it be possible to contact you outside the forum?

    Thanks again,
    Volker
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