<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Yes that could work as well, I will try this too. Thanks!<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 2020. Dec 2., at 7:39, Thornton, Keith <<a href="mailto:keith.thornton@zeiss.com" class="">keith.thornton@zeiss.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Hi,<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Arial, sans-serif;" class="">You could use an outputselector which has a pad to a filesink and a pad to a fakesink.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Gruesse<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class="">Von:</b><span class="Apple-converted-space"> </span>gstreamer-devel <<a href="mailto:gstreamer-devel-bounces@lists.freedesktop.org" class="">gstreamer-devel-bounces@lists.freedesktop.org</a>><span class="Apple-converted-space"> </span><b class="">Im Auftrag von<span class="Apple-converted-space"> </span></b>Nicolas Dufresne<br class=""><b class="">Gesendet:</b><span class="Apple-converted-space"> </span>Mittwoch, 2.<span class="Apple-converted-space"> </span><span lang="EN-US" class="">Dezember 2020 01:05<br class=""><b class="">An:</b><span class="Apple-converted-space"> </span>Discussion of the development of and with GStreamer <<a href="mailto:gstreamer-devel@lists.freedesktop.org" class="">gstreamer-devel@lists.freedesktop.org</a>><br class=""><b class="">Betreff:</b><span class="Apple-converted-space"> </span>Re: GStreamer multi pipeline time sync<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US" class=""><o:p class=""> </o:p></span></p><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Le mar. 1 déc. 2020 16 h 45, Peter Biro <</span><a href="mailto:pettair@gmail.com" style="color: blue; text-decoration: underline;" class=""><span lang="EN-US" class="">pettair@gmail.com</span></a><span lang="EN-US" class="">> a écrit :<o:p class=""></o:p></span></div></div><blockquote style="border-style: none none none solid; border-left-width: 1pt; border-left-color: rgb(204, 204, 204); padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt 4.8pt;" class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Thanks! That can work!<o:p class=""></o:p></span></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> Is there a way how I can 'send silence' from an audio source (or anything in the middle)?<o:p class=""></o:p></span></div></div></div></blockquote></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">audiotestsrc wave=silence ! ...<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">... ! volume volume=0.0 ! ...<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div></div><div class=""><div class=""><blockquote style="border-style: none none none solid; border-left-width: 1pt; border-left-color: rgb(204, 204, 204); padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt 4.8pt;" class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Currently this is my audio pipeline:<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">alsasrc ! queue ! audioconvert ! appsink name=app_sink<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Also I tried to play around with the 'max-size-time' property on a queue, but I cut that solution since I had issues with disabling only the filesink output. The way I tried it is to redirect the filesink output to the /dev/null and reconfigure it to a proper place when a recording event arrives but for that I had to set the file sink state to GST_STATE_NULL (or GST_STATE_READY it was a while ago) which caused issues with the other parts of he pipeline. But it would be great if this part could also be covered by plain pipeline on the gst side.<o:p class=""></o:p></span></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><br class=""><br class=""><o:p class=""></o:p></span></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">On 2020. Dec 1., at 11:38, Thornton, Keith <</span><a href="mailto:keith.thornton@zeiss.com" target="_blank" style="color: blue; text-decoration: underline;" class=""><span lang="EN-US" class="">keith.thornton@zeiss.com</span></a><span lang="EN-US" class="">> wrote:<o:p class=""></o:p></span></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Hi,</span><span lang="EN-US" class=""><o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Arial, sans-serif;" class="">the buffering can be done with a standard gstreamer queue by dynamically manipulating the threshold and queue size parameters. Have you considered the possibility of recording silence when no audio is present.</span><span lang="EN-US" class=""><o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Gruesse</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> <o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class="">Von:</b> gstreamer-devel <<a href="mailto:gstreamer-devel-bounces@lists.freedesktop.org" target="_blank" style="color: blue; text-decoration: underline;" class="">gstreamer-devel-bounces@lists.freedesktop.org</a>> <b class="">Im Auftrag von </b>Peter Biro<br class=""><b class="">Gesendet:</b> Dienstag, 1.<span class="Apple-converted-space"> </span><span lang="EN-US" class="">Dezember 2020 10:21<br class=""><b class="">An:</b> Discussion of the development of and with GStreamer <</span><a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" style="color: blue; text-decoration: underline;" class=""><span lang="EN-US" class="">gstreamer-devel@lists.freedesktop.org</span></a><span lang="EN-US" class="">><br class=""><b class="">Betreff:</b> Re: GStreamer multi pipeline time sync<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> <o:p class=""></o:p></span></div></div><div class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Sure, I can describe it more in detail.<o:p class=""></o:p></span></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> <o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">You are right about that the streaming / displaying is mandatory and the recording is optional (it can be triggered).<o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> <o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Unfortunately the actual use case is a bit more complex: when the user hits record the recording also should include the video(and maybe audio too) for the previous 30 seconds(actual time is also configurable) as well. So there should be a live stream and this 'buffered' recording. Also I cannot 'pre-mux' the audio with the video since audio is completely optional and it could be configured to be recorded only when the recording is started (so there would be video for like 30 seconds from the buffer and then audio would join in later). The hard requirement is this (to have X seconds of video before the user hits the record and optional audio attached to it) but I wanted to implement it in a general way so the other part of the application should not be aware if the 'buffered' data is audio or video.<o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> <o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">This is why I started with separate pipelines and transferring the data between them with appsinks and appsrcs, and do the buffering and other logic on the application side, I guess this is a naive way of implementing it so if there is any suggestion it is more than welcomed :D<o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> <o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Thanks!<o:p class=""></o:p></span></div></div></div><div class=""><div class=""><div class=""><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US" class=""><o:p class=""> </o:p></span></p></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">On 2020. Dec 1., at 5:06, gotsring <</span><a href="mailto:gotsring@live.com" target="_blank" style="color: blue; text-decoration: underline;" class=""><span lang="EN-US" class="">gotsring@live.com</span></a><span lang="EN-US" class="">> wrote:<o:p class=""></o:p></span></div></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""> <o:p class=""></o:p></span></div></div><div class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Can you describe what you are trying to achieve? It sounds like you want to<br class="">grab video and audio (e.g. webcam and mic), combine/mux those streams, then<br class="">be able to view the stream it and optionally record it. Something like:<br class=""><br class="">View/Record pipeline (gst-launch-1.0)<br class="">videotestsrc ! timeoverlay ! tee name=videotee ! queue ! autovideosink \<br class="">audiotestsrc wave=8 ! tee name=audiotee ! queue ! autoaudiosink \<br class="">videotee. ! queue ! x264enc ! matroskamux name=muxer ! filesink<br class="">location=save_location.mkv async=false \<br class="">audiotee. ! queue ! muxer.<br class=""><br class=""><br class="">Playback (just to test)<br class="">gst-play-1.0 save_location.mkv<br class=""><br class="">This should probably not be used exactly, but that's the gist. You can just<br class="">google how to mux streams using GStreamer. I also think that queue has a<br class="">property that allows you to effectively add a delay to a stream<br class="">(min-threshold-time), is this what you wanted?<br class=""><br class=""><br class=""><br class="">--<br class="">Sent from: </span><a href="https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgstreamer-devel.966125.n4.nabble.com%2F&data=04%7C01%7C%7C7d2fc5cd6d09467871ed08d8965fbcdd%7C28042244bb514cd680347776fa3703e8%7C1%7C0%7C637424685218355018%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ioFjTLi1Ddq0JSzhq5Z1CRShYhwIPvmAQyX4yjbkz24%3D&reserved=0" target="_blank" style="color: blue; text-decoration: underline;" class=""><span lang="EN-US" class="">http://gstreamer-devel.966125.n4.nabble.com/</span></a><span lang="EN-US" class=""><br class="">_______________________________________________<br class="">gstreamer-devel mailing list<br class=""></span><a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" style="color: blue; 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