[Live-devel] frame-by-frame transmission of RTP video

[Calkins, David S]

Ross,

Thanks for the reply.  I'll look at the source file you suggested.
Answers to your questions are provided below.

- we're only capturing video, no audio
- the device provides us with discrete uncompressed video frames; we
have a choice as to whether to receive 24-bit color images or 8-bit gray
scale images
- I don't understand all the differences between the two.  Currently,
we'll only be sending video to a single receiving client, but could
eventually need to provide it for access to multiple clients.  We'll all
be connected via a high-speed LAN though, so if the multicasting is used
for bandwidth reduction, it probably wouldn't be necessary

Thanks,
Dave


-----Original Message-----
From: live-devel-bounces at ns.live.com
[mailto:live-devel-bounces at ns.live.com] On Behalf Of Ross Finlayson
Sent: Friday, April 15, 2005 4:32 PM
To: LIVE.COM Streaming Media - development & use
Subject: Re: [Live-devel] frame-by-frame transmission of RTP video


>I've compiled the libraries and used the testProgs applications to test

>the transmission of video over RTP.  The testProgs work great, but
require 
>a video file (test.mpg).
>
>For my C++ application, I will be receiving single video frames from an

>external capture device and will need to send out video via RTP.
>
>Can anyone provide a pointer to where to start for using the libraries
to 
>stream video over RTP using a frame-by-frame approach?

David,

As a starting point, you will need to write a new 'source' class that 
encapsulates video frames from your capture device.  For a model on how
to 
do this, see "liveMedia/DeviceSource.cpp".

Before I can give you a more detailed response, can you tell me:
- Does your capture device capture video frames only, or both video and
audio?
- Does your capture device capture MPEG-1, 2 or 4 video?  And does it 
capture discrete video frames, or does it capture an arbitrary
(unframed) 
sequence of video data?
- Do you want to stream via multicast (e.g., as demonstrated by the 
"test*Streamer" demo applications), or via unicast on demand (e.g., as 
demonstrated by the "testOnDemandRTSPServer" demo application)?


	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>

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