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POWrong Presentation time at H264 streams [Live555 OpenRtspClient]
 

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  1. POWrong Presentation time at H264 streams [Live555 OpenRtspClient]
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    <p>I modify the OpenRtspClient so that</p> <ul> <li><p>Now instead of writing frames to file I collect them in a queue with incoming presenttaion times</p></li> <li><p>Then give the h264 frames to MP4 muxer [ Geraint Davies MP4 mux filter]</p></li> <li>Finally write muxed data to file...</li> </ul> <p>So I can able to save h264 stream into MP4 container...</p> <blockquote> <p>But the problem is that, some of the recorded data [NOT all of them] has wrong values for time duration:</p> </blockquote> <p>Suppose that a 10 minute record seems that it was 12 h stream... VLC play the 10 minute that play last frame for the remaing time.</p> <p>It seems that i set sample times wrong into the Muxer... Then i debug and see that there is positive and negative dramatic jumps at time stamps...</p> <p>Here is how i set time stamps:</p> <ul> <li>Firts i take presentationTime from H264VideoFileSink::afterGettingFrame1 function</li> <li>Then calculate the firstPresentaionTime [ at the beginning]</li> <li>Then collect other timestamps</li> </ul> <p>And I see that frameTimeStamp values show dramatic jumps to negative or positive values...[ i keeep those values as int64 ]</p> <pre><code>#define TIMEVAL_TO_REFERENCE_TIME(x) ((__int64)(x.tv_sec * 1000000) + x.tv_usec) * 10 void H264VideoFileSink:: afterGettingFrame1(unsigned frameSize, struct timeval presentationTime) { // At the beginning [ just for once calculate firstPresentaionTime ] firstPresentaionTime = TIMEVAL_TO_REFERENCE_TIME(presentationTime); // for the other frames collect frames timestamps frameTimeStamp = TIMEVAL_TO_REFERENCE_TIME(presentationTime) - firstPresentationTime } </code></pre> <p>What my cause this? </p> <ul> <li>Or is it agood idea to use this "presentationTime" for a MP4 Muxer?</li> <li>Where the "presentationTime" is calculated at library?</li> <li>Is it possible that H264VideoFileSink::afterGettingFrame1 method "presentationTime" values may be wrong?</li> <li>Anybody record h264 stream in a mp4 contianer and wanted to share his/her experience?</li> </ul>
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