[Live-devel] Missing 44 bytes

[Ross Finlayson]

> Well, an H264 NAL must begin with 00 00 00 01.

No.  “00 00 00 01” is a standard ‘start code’ that is often put in front NAL units when they appear in a byte stream.  But it’s not part of the NAL unit itself, and it is not used at all when NAL units are carried within RTP packets.  (That’s why it’s not present within the H.264 RTP payload.)

HOWEVER, depending on your decoder, you may need to insert that 4-byte start code (“00 00 00 01”) in front of each NAL unit before you pass it to your decoder.  I think that’s the case for “libav”.

Also, make sure you read:
	http://live555.com/liveMedia/faq.html#testRTSPClient-how-to-decode-data


> Here's the DESCRIBE response I'm getting:
[…]
Again, this looks fine.  There seems to be no problem at all with your data; just the way you’re handling it.


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