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<p class="MsoNormal"><span lang="EN-US">Hi<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We found when use playbin3 as playback pipeline, it will hang at startup when one of video/audio/text track setup fail.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">After some analysis, eg, when video track setup fail, the hang happens like below:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Parsebin post stream collection message to parent bin when it expose all src pad (video audio & text)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Playbin3 will handle stream collection message and do stream selection.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Playbin3 will continue request sink pad for selected stream, eg, video and audio pad.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">But when setup video track in decodebin3, it failed (missing decoder) and didn</span><span style="color:black">’<span lang="EN-US">t release playsink video pad.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Playsink will block sink pads until all pads receive something but video pad will never receive data.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Can we request playsink pads when decodebin emit no_more_pad signal, in this way, playsink only request the needed pads just like playbin2 do?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Attachment is my debug log, here I paste some key log:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Decoder selection fail:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.196080488 785 0xffff7c06ee40 DEBUG decodebin3 gstdecodebin3.c:2232:reconfigure_output_stream:<decodebin3-0> Reconfiguring output 0xffff74002490 to slot 0xffff80035f10, needs_decoder:1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.200613128 785 0xffff7c06ee40 DEBUG decodebin3 gstdecodebin3.c:2323:reconfigure_output_stream: Could not find an element for caps video/x-pn-realvideo, width=(int)1920, height=(int)1080,
framerate=(fraction)785645/32768, codec_data=(buffer)000000225649444f5256343007800438000c000000000017f9da0148102040008000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.200686688 785 0xffff7c06ee40 LOG decodebin3 gstdecodebin3.c:2329:reconfigure_output_stream:<decodebin3-0> selection unlocking from thread 0xffff7c06ee40<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.200935928 785 0xffff7c06ee40 LOG decodebin3 gstdecodebin3.c:2336:reconfigure_output_stream:<decodebin3-0> selection locking from thread 0xffff7c06ee40<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.200967608 785 0xffff7c06ee40 LOG decodebin3 gstdecodebin3.c:2336:reconfigure_output_stream:<decodebin3-0> selection locked from thread 0xffff7c06ee40<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.200994968 785 0xffff7c06ee40 DEBUG decodebin3 gstdecodebin3.c:2426:reconfigure_output_stream:<decodebin3-0> Cleanup<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Audio pad is blocked, but video pad cannot been block, playsink only un block all pad when they are all blocked.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.268118651 785 0xffff7c06eea0 LOG playsink gstplaysink.c:4425:sinkpad_blocked_cb:<playsink> locking from thread 0xffff7c06eea0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.268144571 785 0xffff7c06eea0 LOG playsink gstplaysink.c:4425:sinkpad_blocked_cb:<playsink> locked from thread 0xffff7c06eea0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.268166531 785 0xffff7c06eea0 DEBUG playsink gstplaysink.c:4433:sinkpad_blocked_cb:<playsink:audio_sink> Audio pad blocked<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">0:00:00.268189451 785 0xffff7c06eea0 LOG playsink gstplaysink.c:4451:sinkpad_blocked_cb:<playsink> unlocking from thread 0xffff7c06eea0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Playsink: sinkpad_blocked_cb:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> if (gst_play_sink_ready_to_reconfigure_locked (playsink)) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> GST_DEBUG_OBJECT (playsink, "All pads blocked -- reconfiguring");<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> gst_play_sink_do_reconfigure (playsink);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> video_set_blocked (playsink, FALSE);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> audio_set_blocked (playsink, FALSE);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> text_set_blocked (playsink, FALSE);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Jared Hu<o:p></o:p></span></p>
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