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<div><span></span>hi Ross,</div><div><br></div><div>I made changes to send every NAL unit seperately, and made sure all start code were cut off. For the "key frame" (the <span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">SC+SPS+SC+PPS+SC+Frame in one chunk of data), I seperated them and called memmove and afterGetting for each. See the code in grey below.</span></div>
<div><br></div><div><span style="font-family: ''; font-size: 10.5pt; line-height: 1.5; background-color: window;">void Gm813xSource::deliverFrame(void)</span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'="">{<br> int ret;<br> gm_enc_multi_bitstream_t bs;<br><br> if (!isCurrentlyAwaitingData())<br> return; // we're not ready for the data yet<br><br> memset(&bs, 0, sizeof(bs));<br><br> bs.bindfd = main_bindfd;//poll_fds[i].bindfd;<br> bs.bs.bs_buf = frameBuf; // set buffer point<br> bs.bs.bs_buf_len = FRAME_BUF_SIZE; // set buffer length<br> bs.bs.mv_buf = 0; // not to recevie MV data<br> bs.bs.mv_buf_len = 0; // not to recevie MV data<br><br> if (bytesInBuf > 0) { // send leftover data<br> if (bytesInBuf > fMaxSize) {<br> fFrameSize = fMaxSize;<br> fNumTruncatedBytes = bytesInBuf - fMaxSize;<br> bytesInBuf = fNumTruncatedBytes;<br> dataPtr += fFrameSize;<br> } else {<br> fFrameSize = bytesInBuf;<br> bytesInBuf = 0;<br> }<br> memmove(fTo, dataPtr, fFrameSize);<br> FramedSource::afterGetting(this);<br> } else { // get a new frame and send<br> if ((ret = gm_recv_multi_bitstreams(&bs, 1)) < 0) {<br> printf("Error, gm_recv_multi_bitstreams return value %d\n", ret);<br> } else {<br> if ((bs.retval < 0) && bs.bindfd) {<br> printf("Error to receive bitstream. ret=%d\n", bs.retval);<br> } else if (bs.retval == GM_SUCCESS) {<br> u_int8_t* newFrameDataStart = (u_int8_t*)bs.bs.bs_buf; //%%% TO BE WRITTEN %%%<br> unsigned newFrameSize = bs.bs.bs_len; //%%% TO BE WRITTEN %%%<br><br> if(newFrameDataStart[0] == 0x00 && newFrameDataStart[1] == 0x00<br> && newFrameDataStart[2] == 0x00 && newFrameDataStart[3] == 0x01) {<br> newFrameDataStart += 4;<br> newFrameSize -= 4;<br> }<br><br><span style="background-color: rgb(192, 192, 192);"> if(1 == bs.bs.keyframe<br> && newFrameDataStart[10] == 0 && newFrameDataStart[11] == 0<br> && newFrameDataStart[12] == 0 && newFrameDataStart[13] == 1<br> && newFrameDataStart[18] == 0 && newFrameDataStart[19] == 0<br> && newFrameDataStart[20] == 0 && newFrameDataStart[21] == 1<br> ) {<br> fFrameSize = 10;<br> gettimeofday(&fPresentationTime, NULL);<br> memmove(fTo, newFrameDataStart, fFrameSize); // SPS<br> FramedSource::afterGetting(this);<br><br> gettimeofday(&fPresentationTime, NULL);<br> fFrameSize = 4;<br> memmove(fTo, newFrameDataStart+14, fFrameSize); // PPS<br> FramedSource::afterGetting(this);<br><br> newFrameDataStart += (10 + 4 + 4 + 4); // SPS + SC + PPS + SC<br> newFrameSize -= 22;<br> }<br></span><br></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""> bytesInBuf = newFrameSize;<br> dataPtr = newFrameDataStart;<br><br> // Deliver the data here:<br> if (newFrameSize > fMaxSize) {<br> fFrameSize = fMaxSize;<br> fNumTruncatedBytes = newFrameSize - fMaxSize;<br> } else {<br> fFrameSize = newFrameSize;<br> }<br><br> bytesInBuf -= fFrameSize;<br> dataPtr += fFrameSize;<br><br> //fFrameSize = fMaxSize;<br><br> gettimeofday(&fPresentationTime, NULL); // If you have a more accurate time - e.g., from an encoder - then use that instead.<br><br> // If the device is *not* a 'live source' (e.g., it comes instead from a file or buffer), then set "fDurationInMicroseconds" here.<br> memmove(fTo, newFrameDataStart, fFrameSize);<br><br> // After delivering the data, inform the reader that it is now available:<br> FramedSource::afterGetting(this);<br> }<br> }<br> }<br>}<br></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""><br></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'="">Now that I made this changes, the app crashed when I tried to open a session with the server. Since it crashed at inside the libliveMedia, I got some difficulties to debug it. Can you give me some pointers here? </span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""><br></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'="">Belows is the backtrace of this crash.</span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""><br></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'="">(gdb) bt<br>#0 0x76c43e9c in ?? () from /lib/libc.so.0<br>#1 0x76e7d950 in OutPacketBuffer::enqueue(unsigned char const*, unsigned int)<br> () from /mnt/nfs/target/usr/lib/libliveMedia.so.57<br>#2 0x76e7d988 in OutPacketBuffer::enqueueWord(unsigned int) ()<br> from /mnt/nfs/target/usr/lib/libliveMedia.so.57<br>#3 0x76e8c18c in MultiFramedRTPSink::buildAndSendPacket(unsigned char) ()<br> from /mnt/nfs/target/usr/lib/libliveMedia.so.57<br>#4 0x76dfe938 in AlarmHandler::handleTimeout() ()<br> from /mnt/nfs/target/usr/lib/libBasicUsageEnvironment.so.1<br>#5 0x76dfeefc in BasicTaskScheduler::SingleStep(unsigned int) ()<br> from /mnt/nfs/target/usr/lib/libBasicUsageEnvironment.so.1<br>#6 0x76dfe224 in BasicTaskScheduler0::doEventLoop(char volatile*) ()<br> from /mnt/nfs/target/usr/lib/libBasicUsageEnvironment.so.1<br>#7 0x0000bc44 in main (argc=1, argv=0x7efcfdc4) at ../rtspd_main.cpp:74</span></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""><br></span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'="">Again, thanks for your patience.</span></div><div><span style="font-family: "" segoe="" ui'";="" font-size:="" 14px;="" color:="" rgb(0,="" 0,="" 0);="" background-color:="" rgba(0,="" font-weight:="" normal;="" font-style:="" normal;text-decoration:="" none;'=""><br></span></div><hr style="width: 210px; height: 1px;" color="#b5c4df" size="1" align="left">
<div><span><div style="margin: 10px;"><div style="line-height: normal;"><div style="margin: 7.5pt; position: static !important;"><div style="font-family: 'Segoe UI', Tahoma;"><p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-family: 宋体;"><font size="2">Xin</font></p></div><div style="font-size: 14px; font-family: 'Segoe UI', Tahoma;"><p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 宋体;"><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif;">Mobile: +86 </span><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif;">186-1245-1524<o:p></o:p></span></p></div><div style="font-size: 14px;"><p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 12pt;"><span lang="EN-US" style="font-family: Verdana, sans-serif; font-size: 10pt;">Email: </span><span lang="EN-US" style="font-family: Verdana, sans-serif; font-size: 10pt;"><a href="mailto:xliu@vscenevideo.com" style="color: purple;">xliu@vscenevideo.com</a><o:p></o:p></span></p></div><div style="font-size: 14px;"><p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 12pt;"><span lang="EN-US" style="font-family: Verdana, sans-serif; font-size: 10pt;">QQ: </span><span lang="EN-US" style="font-family: Verdana, sans-serif; font-size: 10pt;">156678745</span></p></div></div></div></div></span></div>
<blockquote style="margin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;"><div> </div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style="PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b> <a href="mailto:finlayson@live555.com">Ross Finlayson</a></div><div><b>Date:</b> 2017-01-13 23:52</div><div><b>To:</b> <a href="mailto:live-devel@ns.live555.com">LIVE555 Streaming Media - development & use</a></div><div><b>Subject:</b> Re: [Live-devel] how to make latency as low as possible</div></div></div><div><div>> For the start code, I have eleminated them all. My camera's working pattern is like this, when encoding key frame, it outputs SC+SPS+SC+PPS+SC+Frame, when encoding non-key frame, it outputs SC+Frame. So, after I eleminated the SC, what I sent to the sink object is SPS+PPS+FRAME for key frame, and FRAME alone for non-key frame.</div>
<div>> </div>
<div>> Did I missed something here?</div>
<div> </div>
<div>Yes, you missed the part where I said that:</div>
<div> each ‘frame’ that come from your input source must be a ***single*** H.264 NAL unit, and MUST NOT be prepended by a 0x00 0x00 0x00 0x01 ‘start code’.</div>
<div> </div>
<div>So, you must deliver (without a prepended ‘start code’ in each case):</div>
<div> SPS, then</div>
<div> PPS, then</div>
<div> FRAME, etc.</div>
<div> </div>
<div>***provided that*** FRAME is a single NAL unit. If, instead, FRAME consists of multiple ‘slice’ NAL units (this is actually preferred for streaming, because it’s much more tolerant of network packet loss), then you must deliver each ‘slice’ NAL unit individually (again, without a ‘start code’).</div>
<div> </div>
<div>Also, when testing your server, I suggest first using “openRTSP†<http://www.live555.com/openRTSP/> as a client, before using VLC.</div>
<div> </div>
<div> </div>
<div>Ross Finlayson</div>
<div>Live Networks, Inc.</div>
<div>http://www.live555.com/</div>
<div> </div>
<div> </div>
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</div></blockquote>
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