[Live-devel] RTSP video decoding - packets too small

[Ross Finlayson]

>This video has (on purpose) no audio track, so I can focus on video 
>stream only.
>Payload of value 32 is an MPEG1 or MPEG2 video

That's correct.

An important thing to note about the RTP payload format for MPEG-1 or 
MPEG-2 video (defined in RFC 2250) is that the data units delivered 
by RTP are not (necessarily) complete video frames (even though our 
code refers to them as 'frames' - which is admittedly a bit 
confusing).  For MPEG-1 or 2 video, the data units delivered by RTP - 
i.e., delivered one-at-a-time by a "MPEG1or2VideoRTPSource" object - 
can be MPEG headers, or one or more video 'slices', but need not be a 
complete video frame.  (See RFC 2250 section 3.1 and Appendix 1.) 
This allows a decoder to handle data loss without necessarily 
discarding an entire video frame, but also means that it has to be a 
little smarter about properly detecting when it has received enough 
data to make up an entire frame.
-- 

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