[Live-devel] H264 multicast streaming question

[spopo316 at yahoo.com.tw]

Hi Jeremy:
 
  Thanks for your advice. When i set correct SPS/PPS,then i can streaming H264 file now.
 
 
 Thanks
Best Regards

--- 09/9/11 (五)，Jeremy Noring <kidjan at gmail.com> 寫道：


寄件者: Jeremy Noring <kidjan at gmail.com>
主旨: Re: [Live-devel] H264 multicast streaming question
收件者: "LIVE555 Streaming Media - development & use" <live-devel at ns.live555.com>
日期: 2009年9月11日,五,上午7:14


2009/9/10 <spopo316 at yahoo.com.tw>








But when I streamed the H.264 file by unicsat method successfully , the sprop-parameter-sets has been set “h264”. Therefore i think the sprop-parameter-sets=h264 does't influence the stream when using multicast method. Is it right?


No, that's not right.  For the decoder to understand your H.264 stream, it is crucial that the SPS/PPS info is communicated over a reliable protocol.  If you are not sending in in the sprop-parameter-sets argument, how are you conveying it?  Note that sending it in the actual stream is not recommended (see section 8.4 of RFC3984).  Some people mistakenly think their Live555/H264 implementation "works," but really they're just conveying SPS/PPS info through the lossy RTP channel, which is strongly discouraged by the RFC:

The picture and sequence parameter set NALUs SHOULD NOT be
   transmitted in the RTP payload unless reliable transport is provided
   for RTP, as a loss of a parameter set of either type will likely
   prevent decoding of a considerable portion of the corresponding RTP

   stream.  Thus, the transmission of parameter sets using a reliable
   session control protocol (i.e., usage of principle A or B above) is
   RECOMMENDED.
Botton line: correctly populate sprop-parameter-sets; you are wasting your time by not doing this.

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