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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I didn’t realize SEI contained
timing information. I know that not all encoders generate SEI NAL Units, in
fact, one that we are using doesn’t. But, it should be possible to
generate SEI and insert it into the file stream if the encoder doesn’t
generate it.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dave<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> live-devel-bounces@ns.live555.com
[mailto:live-devel-bounces@ns.live555.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Jerry Johns<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, December 27, 2006
3:22 PM<br>
<b><span style='font-weight:bold'>To:</span></b> live-devel@ns.live555.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Live-devel] Develop
H.264 Support</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi, <br>
If there is anything closely definable as a standard
H.264 format, it would be that ITU JVT spec pointed out by Dave; the NAL unit
delimiter 0x00000001 should be present to identify NAL units, and if ur gonna
talk bout elementary stream H.264, then thats the way to go and i dont see the
confusion (if ur talking bout container types like mov, and mpeg4, thats not
elementary and a different story)<br>
<br>
also, to get frame rate, you need to find the NAL unit of type SEI
(supplemental enhancement information) and there is a picture timing message
structure in there that governs current slice timing <br>
only problem is most of this data is exp golomb coded so getting at it requires
a litlte bitta work (exp golomb is VLC type code i think)<br>
<br>
i've managed to get a basic H264 VideoStreamFramer going that does RTP
packetization of H.264 and it works fine with VLC media player<br>
<br>
if you use single NAL unit mode + FUA framing, you can implement it quite
easily i think<br>
<br>
Jerry<o:p></o:p></span></font></p>
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