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POhow to send h.264 parameter sets 'out of band' during an ongoing RTP session?
 

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  1. POhow to send h.264 parameter sets 'out of band' during an ongoing RTP session?
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    <p>I am implementing an RTSP server in my application to serve h264 video via RTP. I have read the relevant RFC's and spent a lot of time reading about h264/RTP/RTSP and one point which I am still confused about is how to transmit the 'Sequence Parameter Set' and 'Picture Parameter Set' out of band.</p> <p>The documentation that I have read states that these should preferably be transmitted via a reliable out-of-band mechanism but I haven't been able to find anything that defines <em>how</em> to transmit them out of band other than using the sprop-parameter-sets attribute of an SDP file.</p> <p>For instance, RFC 6184 Sectoin 8.4 states:</p> <blockquote> <p>Parameter set NALUs can be transported using three different principles:</p> <p>A. Using a session control protocol (out-of-band) prior to the actual RTP session.</p> <p>B. Using a session control protocol (out-of-band) during an ongoing RTP session.</p> <p>C. Within the RTP packet stream in the payload (in-band) during an ongoing RTP session.</p> </blockquote> <p>...</p> <blockquote> <p>It is recommended to implement principles A and B within a session control protocol ... Section 8.2.2 includes a detailed discussion on transport of parameter sets in-band or out-of-band in SDP Offer/Answer using media type parameters sprop-parameter-sets ... This section contains guidelines on how principles A and B should be implemented within session control protocols.</p> </blockquote> <p>...</p> <blockquote> <p>Parameter sets MAY be added or updated during the lifetime of a session using principles B and C.</p> </blockquote> <p>I have read Sections 8.2.2 and 8.4 and cannot find any description of how to implement method 'B'. Everything that I have read on this topic is incredibly vauge, for instance, Wikipedia has the following to say on the subject: </p> <blockquote> <p>In other applications, it can be advantageous to convey the parameter sets "out-of-band" using a more reliable transport mechanism than the video channel itself.</p> </blockquote> <p>What am I missing here? Is there some other standard for transmitting this via RTSP? RTCP?</p>
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    1. USRobert Smith
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    1. COhave you found a solution to this issue ? I'm kinda stuck here too
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      1. USHaneTV
 

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