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<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have encountered a strange problem while playing an RTP H.264 stream using VLC player.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am developing firmware for an IP camera designed to be used with specialized software (control client).
<o:p></o:p></p>
<p class="MsoNormal">By default, the camera's RTSP streamer (based on wis-streamer with a custom video source) had a bug where in each GOP, the SPS, PPS, SEI and IDR-frame were all grouped, and the stream simply consisted of an SPS NAL unit, followed by several
P-slices. The PPS, SEI, and IDR-frame were all hidden inside the payload of the SPS packet. This caused the target software to be unable to play the stream, yet VLC player worked just fine.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After fixing the video source and properly splitting the various NAL units, the stream works properly on the target client, but now it works only partially with VLC - sometimes it works well, other times it freezes after showing 1-2 frames.
Looking at the wireshark capture, the stream now looks like a proper H.264 stream: SPS, PPS, SEI, IDR, P-Slice, P-Slice, P-Slice…<o:p></o:p></p>
<p class="MsoNormal">I've uploaded wireshark logs and VLC logs for both scenarios (old stream, new stream):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">https://www.dropbox.com/s/kk4m04toudijb82/new.log<o:p></o:p></p>
<p class="MsoNormal">https://www.dropbox.com/s/gyg39osmhqi7p1r/New.pcapng<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">https://www.dropbox.com/s/ewank7m3itt8jcr/old.log<o:p></o:p></p>
<p class="MsoNormal">https://www.dropbox.com/s/jk08a4nq8cuog76/Old.pcapng<o:p></o:p></p>
<p class="MsoNormal"><br>
I’ve posted this question to the VLC support boards and was advised it might be a live555 problem and that I should ask about it over here.<o:p></o:p></p>
<p class="MsoNormal">Any help would be greatly appreciated.<o:p></o:p></p>
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