Video Streaming Server

lang er erlangist@REDACTED
Wed Aug 16 19:41:27 CEST 2006

Thank you all very much.
A working solution give me much confidence.


2006/8/16, Samuel Rivas <samuelrivas@REDACTED>:
> lang er wrote:
> > Do you mean a C program reads video stream from device and transfer
> > data to Erlang server using local socket, then Erlang server streams
> > video data to client?
> >
> > Our server will connect to many devices(if user watch many different
> > cameras installed on many different devices).By this way, C program
> > also need to deal with many concurrent problems. It supposed these
> > problems should be done in Erlang side, and  there will be little
> > benefit to reimplement streaming server in Erlang.
>   We have a system that does similar things:
>   For the video sources that can not be properly handled in erlang, it
> uses a port process, normally written in C. There is no concurrency in
> the C side since each source is handled by a different process.
> > Another problem, In surveillance system, QoS( network delay
> > especially) is very import, I think your solution may introduce some
> > additional network delay.
>   Well, a local socket (or using standard input/outuput of the port
> process) should not introduce a significant delay. I shall suggest to
> write a small prototype to check if it meet your requirements:
>   Simply write a C program that reads video from one of your sources and
> outputs it to the standard output. Then write an erlang program that
> opens this program as port (with the stream option), reads the output
> data, and sends it to a socket. You will have the complete trip
> device --> SDK port --> erlang --> network.
> > I wonder if this is the standard way Erlang program use external SDK.
> > I have read some posts in this list, and got a impression that Erlang
> > is used in telecommunication device systems and hardware controller
> > programs. Don't they need interact with SDK(dynamic linked library)?
>   If the system meets the performance requirements, having all external
> code running in separated processes is the safest solution. Otherwise you
> may need linked drivers, but they are much more dangerous.
>   Regards
> --
>         Samuel
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