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<blockquote data-quote="mm1352000" data-source="post: 1136141" data-attributes="member: 82144"><p>If the problem is occurring in <em>FramedSource::getNextFrame() </em>where Sascha said, the error must be that <em>fIsCurrentlyAwaitingData</em> is <em>true</em> when it should be <em>false.</em></p><p></p><p>How did that variable get set <em>true</em>? Well, <em>fIsCurrentlyAwaitingData </em>is only set<em> true </em>in one place:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L76" target="_blank"><em>https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L76</em></a></p><p></p><p>Note that is at the end of the same <em>getNextFrame() </em>function.</p><p></p><p></p><p>How is this <em>getNextFrame() </em>function called?</p><p>It's a long story that starts when the streaming server is asked to start streaming a timeshift file:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/main.cpp#L214" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/main.cpp#L214</a></p><p></p><p><em>StreamAddTimeShiftFile()</em> creates a <em>TsMPEG2TransportFileServerMediaSubsession</em>, and adds it to the RTSP server.</p><p></p><p>We can see that the RTSP server is an instance of <em>MPRTSPServer</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/main.cpp#L164" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/main.cpp#L164</a></p><p></p><p><em>MPRTSPServer</em> is an extension of <em>RTSPServer</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/MediaPortal/MPRTSPServer.h#L30" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/MediaPortal/MPRTSPServer.h#L30</a></p><p></p><p>When a client tries to connect to an <em>RTSPServer</em> sub-session, it sends an RTSP SETUP command. That command is handled here:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/RTSPServer.cpp#L606" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/RTSPServer.cpp#L606</a></p><p></p><p>As part of <em>handleCmd_SETUP()</em> we see that the sub-session's <em>getStreamParameters() </em>function is called:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/RTSPServer.cpp#L726" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/RTSPServer.cpp#L726</a></p><p></p><p>Now, we have already seen that a timeshifting sub-session is an instance of <em>TsMPEG2TransportFileServerMediaSubsession. </em>A <em>TsMPEG2TransportFileServerMediaSubsession </em>is a <em>FileServerMediaSubsession</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.h#L9" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.h#L9</a></p><p></p><p>...and a <em>FileServerMediaSubsession</em> is a <em>OnDemandServerMediaSubsession</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/include/FileServerMediaSubsession.hh#L29" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/include/FileServerMediaSubsession.hh#L29</a></p><p></p><p>Therefore, when <em>getStreamParameters() </em>is called, the base implementation in <em>OnDemandServerMediaSubsession</em> will be called:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/OnDemandServerMediaSubsession.cpp#L144" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/OnDemandServerMediaSubsession.cpp#L144</a></p><p></p><p>Inside that function we see that <em>createNewStreamSource() </em>is called:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/OnDemandServerMediaSubsession.cpp#L172" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/OnDemandServerMediaSubsession.cpp#L172</a></p><p></p><p>This function is overridden by <em>TsMPEG2TransportFileServerMediaSubsession</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L36" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L36</a></p><p></p><p>Within <em>createNewStreamSource() </em>we see that a new <em>TsStreamFileSource</em> is created, and wrapped in a <em>TsMPEG2TransportStreamFramer</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L42" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L42</a></p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L47" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L47</a></p><p></p><p>When the server is streaming the timeshift file, <em>doGetNextFrame() </em>will be called repeatedly:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportStreamFramer.cpp#L78" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportStreamFramer.cpp#L78</a></p><p></p><p>We already know that <em>fInputSource</em> is a <em>TsStreamFileSource</em>; a <em>TsStreamFileSource</em> is a <em>FramedFileSource</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.h#L33" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.h#L33</a></p><p></p><p>...and a <em>FramedFileSource </em>is a <em>FramedSource</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/include/FramedFileSource.hh#L28" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/include/FramedFileSource.hh#L28</a></p><p></p><p>So, when <em>TsMPEG2TransportStreamFramer::doGetNextFrame() </em>calls <em>fInputSource->getNextFrame()</em>, it will call the base <em>FramedSource::getNextFrame()</em> function.</p><p></p><p>Now finally (!!!) we start to get closer to the explanation of the error! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p><em>getNextFrame()</em> calls the virtual <em>doGetNextFrame() </em>function. In the case of timeshifting, this will call the implementation in <em>TsStreamFileSource</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L149" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L149</a></p><p></p><p>At the end of <em>TsStreamFileSource::doGetNextFrame()</em>, we see that <em>FramedSource::afterGetting() </em>should be called:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L202" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L202</a></p><p></p><p><em>afterGetting() </em>is one of the three places where <em>fIsCurrentlyAwaitingData </em>is set <em>false</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L82" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L82</a></p><p></p><p>In other words: it seems to me that the code is designed to set <em>fIsCurrentlyAwaitingData </em>to <em>true</em> in <em>getNextFrame()</em>, then set it back to <em>false </em>in <em>afterGetting(). </em>If the value is <em>true</em> already at the start of <em>getNextFrame()</em>, my guess is that <em>afterGetting()</em> has not been executed yet because of a delay in <em>doGetNextFrame().</em></p><p><em></em></p><p>Looking at the code in <em>doGetNextFrame()</em>, the most likely place for a delay seems to be when the code is trying to access the file system:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L178" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L178</a></p><p></p><p><em>GetFileSize() </em>is implemented here:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/MultiFileReader.cpp#L130" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/MultiFileReader.cpp#L130</a></p><p></p><p>As you can see, the implementation calls <em>RefreshTSBufferFile()</em>:</p><p><a href="https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/MultiFileReader.cpp#L294" target="_blank">https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/MultiFileReader.cpp#L294</a></p><p></p><p>That function is relatively complex, and I suspect it could be slow in some rare cases. Especially:</p><p>1. When TsWriter is trying to update the buffer file.</p><p>2. When TV service is trying to clean up (delete) the buffer files.</p><p>3. If the timeshift folder is a shred folder.</p><p></p><p>[USER=128461]@Snoopy87[/USER] </p><p>In your plugin, what is the delay between stopping timeshifting... and starting timeshifting again?</p><p>If the delay is small, I wonder if TV service is still trying to delete the timeshift files... and that could be the reason for the problem.</p><p>I wonder what would happen if you try to increase (or reduce!) the delay.</p><p></p><p>[USER=83973]@Owlsroost[/USER]</p><p>Your thoughts about this would be most welcome.</p></blockquote><p></p>
[QUOTE="mm1352000, post: 1136141, member: 82144"] If the problem is occurring in [I]FramedSource::getNextFrame() [/I]where Sascha said, the error must be that [I]fIsCurrentlyAwaitingData[/I] is [I]true[/I] when it should be [I]false.[/I] How did that variable get set [I]true[/I]? Well, [I]fIsCurrentlyAwaitingData [/I]is only set[I] true [/I]in one place: [URL='https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L76'][I]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L76[/I][/URL] [I][/I] Note that is at the end of the same [I]getNextFrame() [/I]function. How is this [I]getNextFrame() [/I]function called? It's a long story that starts when the streaming server is asked to start streaming a timeshift file: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/main.cpp#L214[/URL] [I]StreamAddTimeShiftFile()[/I] creates a [I]TsMPEG2TransportFileServerMediaSubsession[/I], and adds it to the RTSP server. We can see that the RTSP server is an instance of [I]MPRTSPServer[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/main.cpp#L164[/URL] [I]MPRTSPServer[/I] is an extension of [I]RTSPServer[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/MediaPortal/MPRTSPServer.h#L30[/URL] When a client tries to connect to an [I]RTSPServer[/I] sub-session, it sends an RTSP SETUP command. That command is handled here: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/RTSPServer.cpp#L606[/URL] As part of [I]handleCmd_SETUP()[/I] we see that the sub-session's [I]getStreamParameters() [/I]function is called: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/RTSPServer.cpp#L726[/URL] Now, we have already seen that a timeshifting sub-session is an instance of [I]TsMPEG2TransportFileServerMediaSubsession. [/I]A [I]TsMPEG2TransportFileServerMediaSubsession [/I]is a [I]FileServerMediaSubsession[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.h#L9[/URL] ...and a [I]FileServerMediaSubsession[/I] is a [I]OnDemandServerMediaSubsession[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/include/FileServerMediaSubsession.hh#L29[/URL] Therefore, when [I]getStreamParameters() [/I]is called, the base implementation in [I]OnDemandServerMediaSubsession[/I] will be called: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/OnDemandServerMediaSubsession.cpp#L144[/URL] Inside that function we see that [I]createNewStreamSource() [/I]is called: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/OnDemandServerMediaSubsession.cpp#L172[/URL] This function is overridden by [I]TsMPEG2TransportFileServerMediaSubsession[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L36[/URL] Within [I]createNewStreamSource() [/I]we see that a new [I]TsStreamFileSource[/I] is created, and wrapped in a [I]TsMPEG2TransportStreamFramer[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L42[/URL] [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportFileServerMediaSubsession.cpp#L47[/URL] When the server is streaming the timeshift file, [I]doGetNextFrame() [/I]will be called repeatedly: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsMPEG2TransportStreamFramer.cpp#L78[/URL] We already know that [I]fInputSource[/I] is a [I]TsStreamFileSource[/I]; a [I]TsStreamFileSource[/I] is a [I]FramedFileSource[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.h#L33[/URL] ...and a [I]FramedFileSource [/I]is a [I]FramedSource[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/include/FramedFileSource.hh#L28[/URL] So, when [I]TsMPEG2TransportStreamFramer::doGetNextFrame() [/I]calls [I]fInputSource->getNextFrame()[/I], it will call the base [I]FramedSource::getNextFrame()[/I] function. Now finally (!!!) we start to get closer to the explanation of the error! :) [I]getNextFrame()[/I] calls the virtual [I]doGetNextFrame() [/I]function. In the case of timeshifting, this will call the implementation in [I]TsStreamFileSource[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L149[/URL] At the end of [I]TsStreamFileSource::doGetNextFrame()[/I], we see that [I]FramedSource::afterGetting() [/I]should be called: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L202[/URL] [I]afterGetting() [/I]is one of the three places where [I]fIsCurrentlyAwaitingData [/I]is set [I]false[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/LiveMedia555/liveMedia/FramedSource.cpp#L82[/URL] In other words: it seems to me that the code is designed to set [I]fIsCurrentlyAwaitingData [/I]to [I]true[/I] in [I]getNextFrame()[/I], then set it back to [I]false [/I]in [I]afterGetting(). [/I]If the value is [I]true[/I] already at the start of [I]getNextFrame()[/I], my guess is that [I]afterGetting()[/I] has not been executed yet because of a delay in [I]doGetNextFrame(). [/I] Looking at the code in [I]doGetNextFrame()[/I], the most likely place for a delay seems to be when the code is trying to access the file system: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/TsStreamFileSource.cpp#L178[/URL] [I]GetFileSize() [/I]is implemented here: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/MultiFileReader.cpp#L130[/URL] As you can see, the implementation calls [I]RefreshTSBufferFile()[/I]: [URL]https://github.com/MediaPortal/MediaPortal-1/blob/master/DirectShowFilters/StreamingServer/Source/MultiFileReader.cpp#L294[/URL] That function is relatively complex, and I suspect it could be slow in some rare cases. Especially: 1. When TsWriter is trying to update the buffer file. 2. When TV service is trying to clean up (delete) the buffer files. 3. If the timeshift folder is a shred folder. [USER=128461]@Snoopy87[/USER] In your plugin, what is the delay between stopping timeshifting... and starting timeshifting again? If the delay is small, I wonder if TV service is still trying to delete the timeshift files... and that could be the reason for the problem. I wonder what would happen if you try to increase (or reduce!) the delay. [USER=83973]@Owlsroost[/USER] Your thoughts about this would be most welcome. [/QUOTE]
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