[Live-devel] Getting the FPS at the client side

[Sagi Ben Moshe]

Hi Ross,

We are writing the server and the client sides with Live555 library. 
The server broadcasts live source frames (PAL or NTSC) and the client side
receives these frames and put them on a small display. We are looking for a
way to write the FPS (Or maybe PAL, NTSC) data to the SDP on the server side
and using the subsession->videoFPS() function or any other function on the
client side get this FPS or (PAL, NTFS metadata). 

Is it possible? If so what is the best way to implement this. 

We prefer not to get it from the decoding data. 

Thanks,
Sagi

-----Original Message-----
From: live-devel-bounces at ns.live555.com
[mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: Tuesday, August 31, 2010 7:22 AM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] Getting the FPS at the client side

>At the client streamer, when I get a video link (Mpeg4 or H264) I
>get a set of parameters but the subsession->videoFPS() (frames per
>second) is set to zero.

As others have noted, this is not always present in the stream's SDP
description.

>How can I get the Fps of the video link?

In general you will need to decode the video stream - at least,
decode it enough so that you can figure out which received data
contains the start of video frames.  And then, from this - plus the
presentation times - you can figure out the frame rate.
--

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