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</o:shapelayout></xml><![endif]--></head><body lang=SK link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='color:#365F91'>Hi developers,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'>I hope that somebody can help me with problem while seeking in librtmp. I’m working as developer on splitter for OnlineVideos plugin (<a href="http://code.google.com/p/mp-onlinevideos2/">http://code.google.com/p/mp-onlinevideos2</a>) for MediaPortal (<a href="http://www.team-mediaportal.com/">http://www.team-mediaportal.com</a>). While testing seeking in RTMP streams I found problem with handling metadata (error: DECODING ERROR, IGNORING BYTES UNTIL NEXT KNOWN PATTERN!).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'>Before I describe the problem with handling metadata I have to write that I changed RTMP_ConnectStream() method to request seek in RTMP stream correctly, because your implementation doesn’t work on any server which I tests.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas;color:blue'>int</span><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'>RTMP_ConnectStream(RTMP *r, <span style='color:blue'>int</span> seekTime)<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'>{<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> RTMPPacket packet = { 0 };<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>int</span> tempSeekTime = 0;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:green'>/* seekTime was already set by SetupStream / SetupURL.</span><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas;color:green'> * This is only needed by ReconnectStream.</span><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas;color:green'> */</span><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:green'>/*if (seekTime > 0)</span><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas;color:green'> r->Link.seekTime = seekTime;*/</span><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> r->m_mediaChannel = 0;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> tempSeekTime = r->Link.seekTime;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> r->Link.seekTime = 0;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>while</span> (!r->m_bPlaying && RTMP_IsConnected(r) && RTMP_ReadPacket(r, &packet))<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> {<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>if</span> (RTMPPacket_IsReady(&packet))<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> {<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>if</span> (!packet.m_nBodySize)<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>continue</span>;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>if</span> ((packet.m_packetType == RTMP_PACKET_TYPE_AUDIO) ||<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> (packet.m_packetType == RTMP_PACKET_TYPE_VIDEO) ||<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> (packet.m_packetType == RTMP_PACKET_TYPE_INFO))<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> {<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> RTMP_Log(RTMP_LOGWARNING, <span style='color:#A31515'>"Received FLV packet before play()! Ignoring."</span>);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> RTMPPacket_Free(r, &packet);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>continue</span>;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> }<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> RTMP_ClientPacket(r, &packet);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> RTMPPacket_Free(r, &packet);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> }<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> }<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> r->Link.seekTime = tempSeekTime;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>if</span> ((r->Link.seekTime > 0) && (r->m_bPlaying))<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> {<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>if</span> (!RTMP_SendSeek(r, r->Link.seekTime))<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> {<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> RTMP_Close(r);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> }<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> }<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'> <span style='color:blue'>return</span> r->m_bPlaying;<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'>}<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91;mso-fareast-language:EN-US'>Now back to problem. After requesting seek on RTMP stream I received response with different metadata as librtmp expects. Actually in stream are two metadata packets, first handled correctly, second not. When I investigated issue I found that in second metadata packet are four extra bytes (positions 0x2788E8 – 0x2788EB in dump file). You can download network dump file with packet sizes from </span><span lang=EN-US style='color:#365F91'><a href="https://rapidshare.com/files/1882268158/rtmp_seek_dump.zip">https://rapidshare.com/files/1882268158/rtmp_seek_dump.zip</a>. In archive are two files rtmp_network.dump – contains each packet received from server and rtmp_network_packet_size.txt – contains sizes of each packet received from server.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'>Connection string passed to librtmp was (you can’t test video because it’s geo-locked, so I created network dump file):<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'>rtmp://wcdn1001.nacevi.cz/ct-vod?id=MTQzMzMwNzc0Nnw2MzQ2NTI3ODg4OTcwMzc1MDA=&type=wpl/mp4:ct/iVysilani/2011/11/06/FedCup2011CT4-061111-MP4_576p.mp4 app=ct-vod?id=MTQzMzMwNzc0Nnw2MzQ2NTI3ODg4OTcwMzc1MDA=&type=wpl pageUrl=http://www.ceskatelevize.cz/ivysilani/10321546303-fed-cup-2011/211471290110010-rusko-cesko/ playpath=mp4:ct/iVysilani/2011/11/06/FedCup2011CT4-061111-MP4_576p.mp4 start=21612460 swfUrl=http://img9.ceskatelevize.cz/libraries/player/flashPlayer.swf?version=1.44.6 tcUrl=rtmp://wcdn1001.nacevi.cz/ct-vod?id=MTQzMzMwNzc0Nnw2MzQ2NTI3ODg4OTcwMzc1MDA=&type=wpl<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'>I hope that somebody of you can help me. Thanks.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91'>Greetings,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#365F91;mso-fareast-language:EN-US'>Juraj Horvath</span><span lang=EN-US><o:p></o:p></span></p></div>
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