[Live-devel] Streaming with Sensoray 2250 encoded data

[Ross Finlayson]

>I am trying to stream video from a platform that 
>has a Sensoray 2250 encoder installed on it. I 
>have already verified that all of the hardware 
>works and that data produced from it can be 
>streamed using the live library by doing the 
>following:
>·         Created a process that grabs MPEG2 
>frames from the encoder and dumps them to a 
>named pipe
>·         Modified testMPEG1or2VideoStreamer to 
>look at this pipe for data, and stream it to a 
>specified IP address
>·         Works fine, except that, as you can 
>image, there is some major delay in the video 
>which I cannot have due to the nature of what 
>this video stream is being used for.

You can probably eliminate most of this delay by 
reducing the maximum buffering used by your pipe. 
(I don't know how you would do this, but there 
should be a way.)

This method - piping encoded data directly to the 
(modified) "testMPEG1or2VideoStreamer" is *by 
far* the easiest way to get what you want.  I 
recommend sticking with this approach if you can.


>
>I decided to move on and write a FramedSource 
>subclass that encapsulates my encoder, and 
>deliver this object directly to a 
>MPEG1or2VideoRTPSink.

You should insert a 
"MPEG1or2VideoStreamDiscreteFramer" in front of 
your "MPEG1or2VideoRTPSink".


>The thing that is very odd is that it seems like 
>my implementation of doGetNextFrame() is never 
>executed

You should first make sure that you can walk 
before you try to run.  I suggest that you begin 
by trying to write your encoded data to a file 
rather than streaming it over a network.  I.e., 
start by using a "FileSink" instead of a 
"MPEG1or2VideoRTPSink".  Once you have shown that 
you can successfully write your encoded data into 
a file (and test that the data is correct by 
trying to play the file in a media player), then 
it would make sense to move to streaming.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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