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PORTP Buffer Side Effects
 

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    <p>In previous version of my <code>RTSP Source Filter</code>, I was immediately packing the RTP packets in order I receive them. There was no buffer, sorting by sequence number, dropping frames with missing pieces etc. but result was ok since I made my tests on LAN. I decided to add an RTP buffer, sorting mechanism etc. Actually, core code was successful. But now I have some problems with sending the frames with correct timing.</p> <p>I have a debugging mechanism. I'm able to store all the frames into seperate files like frame0.bin, frame1.bin etc. and I have a tool which is able to read these files and send it to h.264 decoder. When I playback these frames, result is perfect. I believe that proves my RTP and frame buffers work fine.</p> <p>When I try to pass the frame to <code>FillBuffer</code> function as soon as a frame is created (actually when my frame queue has more than 1 frames), result is really crappy (I get the image but with delays and corrupted frames). It's probably caused by passing frames to <code>FillBuffer</code> function immediatelly. My <code>DoBufferProcessingLoop</code> function looks like below (I removed most of the error checks from the code);</p> <pre><code>HRESULT RtspSourceFilterOutputPin::DoBufferProcessingLoop() { Command com; REFERENCE_TIME rtNow = 0L; REFERENCE_TIME rtAdvise = 0L; OnThreadStartPlay(); do { while (!CheckRequest(&amp;com)) { if(streamReader-&gt;frames.size() &gt; 1) { IMediaSample *pSample; GetDeliveryBuffer(&amp;pSample,NULL,NULL,FALSE); hr = FillBuffer(pSample); if (hr == S_OK) { HRESULT result = Deliver(pSample); } else if (hr == S_FALSE) { pSample-&gt;Release(); DeliverEndOfStream(); return S_OK; } else { //error } pSample-&gt;Release(); } } if (com == CMD_RUN || com == CMD_PAUSE) { com = GetRequest(); } else if (com != CMD_STOP) { //error } } while (com != CMD_STOP); return S_OK; } </code></pre> <p>Since streaming is realtime, I removed all timestamps (<code>SetTime</code>, <code>SetMediaTime</code> etc.) from <code>FillBuffer</code> function. There is nothing special with <code>FillBuffer</code>. It just pops a frame from frames queue and pass it to the decoder. And it works if a remove my buffer mechanism.</p> <p>Finally, the quesiton is...</p> <p>Should I wait for some time like "received time + buffer time" before sending a frame instead of passing it to <code>FillBuffer</code> as soon as its created? Or should I use <code>SetTime</code> in <code>FillBuffer</code> function? I already tried it and failed. I also tried to give start/stop time values with buffer time added but didn't work any better.</p> <p>Why is the result crappy when I pass the frame to the decoder but result is ok if I save these frames to binary files and playback from these files? What am I missing here?</p>
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