[Live-devel] Video & Audio Properties at RTP Receivers

[Ross Finlayson]

The properties that you're asking about - video width & height, video 
frame rate, audio sampling frequency, audio number of channels are 
almost always contained within the media data themselves, and are 
therefore accessed by your decoding software (or hardware), when it 
parses this media data.  (A reminder that the "LIVE555 Streaming 
Media" software does not include decoding software.)  I.e., it is the 
job of your decoder to parse the media data and extract this 
information.

One exception to this is that *some* simple audio codecs (e.g., PCM) 
do not include the audio sampling frequency and number of channels 
'in band'.  For these codecs (only), these properties are carried 
separately, in the stream's SDP description, and can be accessed from 
the stream's "MediaSubession" object.

>2. For H.264, is there any parser for the extra info returned by
>parseH264ConfigStr ?

This data is a sequence of H.264 NAL units, and are therefore 
parsed/interpreted by your H.264 decoder.
-- 

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