<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> Hello, I strongly believe I have experienced similar issues, but related to images/video instead of audio. Your basic problem is that 'multifilesrc' is not a live source, while you use the 'audiotestsrc' as live. That basically means that while a live source will produce buffers based on the configured timing (from CAPS), the non-live source will produce buffers as fast as possible (or as fast as the downstream elements tell it to). You can try checking the difference by doing: <pre class="moz-quote-pre" wrap="">audiotestsrc is-live=true wave=ticks ! audio/x-raw,format=S16LE,rate=48000,channels=1 ! autoaudiosink sync=true</pre> And <pre class="moz-quote-pre" wrap="">audiotestsrc is-live=true wave=ticks ! audio/x-raw,format=S16LE,rate=48000,channels=1 ! autoaudiosink sync=false</pre> For the live source you shouldn't see any difference. But I expect that you will see for the non-live, depending on using 'autoaudiosink sync=true' or 'autoaudiosink sync=false' <pre class="moz-quote-pre" wrap="">multifilesrc do-timestamp=true loop=true location=count.wav ! wavparse ignore-length=1 ! audio/x-raw,format=S16LE,rate=48000,channels=1 ! autoaudiosink sync=false </pre> Now, the way I managed to have file sources working as "live sources" for me was by adding either a 'identity sync=true' or 'clocksync' to the pipeline. Something like: <pre class="moz-quote-pre" wrap="">multifilesrc do-timestamp=true loop=true location=count.wav ! wavparse ignore-length=1 ! audio/x-raw,format=S16LE,rate=48000,channels=1 ! clocksync ! autoaudiosink sync=false</pre> Now, I do remember some issues with 'multifilesrc', so I would recommend trying also with 'filesrc' instead. And I was using H264 streams packed to MPEG-TS, in this case it would only work after the demuxer: <div style="color: #d4d4d4;background-color: #1e1e1e;font-family: 'Droid Sans Mono', 'monospace', monospace, 'Droid Sans Fallback';font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div>gst-launch-1.0 filesrc location=/tmp/test1.ts ! tsdemux name=demux :</div><div>queue ! identity sync=true ! h264parse ! avdec_h264 qos=false ! videoconvert ! ximagesink</div><div>demux. : queue ! identity sync=true ! decodebin : audioconvert ! autoaudiosink</div></div> Note that I haven't tested any of the pipelines besides this last one, which comes from my own project... Best Regards Marianna S. Buschle <div class="moz-cite-prefix">On 13.01.2022 13.00, <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel-request@lists.freedesktop.org">gstreamer-devel-request@lists.freedesktop.org</a> wrote: </div> <blockquote type="cite" cite="mid:mailman.46.1642075203.14000.gstreamer-devel@lists.freedesktop.org"> <pre class="moz-quote-pre" wrap="">Hello everyone, I'm having an issue here that's probably very simple, but I can't see what's wrong. I've been using the following audio source for testing in my larger WebRTC pipeline: audiotestsrc is-live=true wave=ticks ! audio/x-raw,format=S16LE,rate=48000,channels=1 ! tee allow-not-linked=true name=audiotestsrc Now I've tried to replace it with an audiofile of a voice counting (to estimate delay etc.): multifilesrc do-timestamp=true loop=true location=count.wav ! wavparse ignore-length=1 ! audio/x-raw,format=S16LE,rate=48000,channels=1 ! tee allow-not-linked=true name=audiotestsrc The audiofile does have S16LE/48kHz/mono, so there shouldn't be any format issues. Both variants work when I run them in gst-launch-1.0 and append an autoaudiosink at the end; I can even replicate the encoder pipeline by appending "... ! queue ! opusenc ! rtpopuspay ! queue max-size-time=100000000 ! rtpopusdepay ! opusdec ! autoaudiosink" and it still works for both of them. However, when I connect the encoder output to webrtcbin within my larger pipeline, then the multifilesrc seems to never start streaming. Caps negotiation and WebRTC SDP negotiation both complete and seem to be fine, but I'm never actually getting an audiostream unless I keep using audiotestsrc (or e.g. alsasrc/pulsesrc, those work as well). For the curious, audiofile in question is here: <a class="moz-txt-link-freetext" href="https://floe.butterbrot.org/external/count.wav" moz-do-not-send="true">https://floe.butterbrot.org/external/count.wav</a> Any suggestions? Thanks and best regards, Florian</pre> </blockquote> <pre class="moz-signature" cols="72">-- Best regards / Med venlig hilsen “Marianna Smidth Buschle”</pre> </body> </html>