title: Syntax of H.264 SPS/PPS in SIP/SDP offer
body: <p>According to RFC 6184:</p>
  
  <blockquote>
    <p>Annex B of H.264 defines an encapsulation    process to transmit such
    NALUs over bytestream-oriented networks.  In    the scope of this
    memo, Annex B is not relevant.</p>
  </blockquote>
  
  <p>I see a lot of examplex, including in RFC6236, of SPS/PPS like this  </p>
  
  <pre><code>a=fmtp:99 packetization-mode=0;profile-level-id=42e011; \
        sprop-parameter-sets=Z0LgC5ZUCg/I,aM4BrFSAa  
  </code></pre>
  
  <p>However, according to H.264, Annex B, there should be no comma, and a preamble must be added to the beginning of both SPS and PPS (and after that SPS/PPS is converted to base 64). </p>
  
  <p>So I don't understand what is the right thing to do.</p>