<div dir="ltr"><div dir="ltr">Hi dananjaya, we are also using GStreamer for a project that involves mixing multiple live sources together. For us, the audiomixer would very often generate what we called "gritches" that upon looking at the output in Audacity were revealed to be small silence gaps in the output. Reading the source code and playing with it has led to the gst_aggregator_pad_has_space function that has a test that I believe is incorrect (in all humbleness being fairly new to GStreamer) : if (self->priv->latency == 0) return FALSE; I think this test should only apply in the non-live case, but in any case the good news is that by setting latency to any value in our audiomixer element (even 1), this has solved most of our problems. PS: You could also replace audiomixer with liveadder which is a subclass of audiomixer that by default sets latency to 30ms. </div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 5, 2021 at 6:51 AM dananjaya <<a href="mailto:pulzappcheck890@gmail.com">pulzappcheck890@gmail.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi, I am trying the below pipeline to capture 2 1080p usb video streams while previewing, with 2 usb audio sources mixed together. The issue is, the audio mixed and captured is containing lots of artifacts such as click sounds. How can I resolve this issue. gst-launch-1.0 -e mp4mux name=mux ! filesink location=feed1mp1080HS.mp4 v4l2src device=/dev/video1 ! tee name=t1 t1. ! queue ! video/x-raw, width=1920, height=1080, framerate=30/1 ! nvvidconv ! queue ! nvv4l2h264enc maxperf-enable=1 bitrate=4000000 profile=4 ! queue ! h264parse ! queue ! mux.video_0 audiomixer name=mixer ! audioconvert ! voaacenc ! aacparse ! mux.audio_0 pulsesrc device="alsa_input.usb-VXIS_Inc_ezcap_U3_capture-02.analog-stereo" ! queue ! audio/x-raw,width=16,depth=16,rate=44100,channel=1 ! queue ! mixer.sink_0 pulsesrc device="alsa_input.usb-C-Media_Electronics_Inc._USB_Advanced_Audio_Device-00.analog-stereo" ! queue ! audio/x-raw,width=16,depth=16,rate=44100,channel=1 ! queue ! mixer.sink_1 t1. ! queue ! video/x-raw, width=1920, height=1080, framerate=30/1 ! nvvidconv ! queue ! "video/x-raw(memory:NVMM),width=959,height=540,framerate=30/1,format=NV12" ! queue ! nvoverlaysink overlay-x=0 overlay-y=270 overlay-w=959 overlay-h=540 overlay=1 v4l2src device=/dev/video2 ! tee name=t2 t2. ! queue ! video/x-raw, width=1920, height=1080, framerate=30/1 ! nvvidconv ! queue ! nvv4l2h264enc maxperf-enable=1 bitrate=4000000 profile=4 ! queue ! h264parse ! queue ! mp4mux ! filesink location=feed2mp1080HS.mp4 t2. ! queue ! video/x-raw, width=1920, height=1080, framerate=30/1 ! nvvidconv ! queue ! "video/x-raw(memory:NVMM),width=960,height=540,framerate=30/1,format=NV12" ! queue ! nvoverlaysink overlay-x=960 overlay-y=270 overlay-w=960 overlay-h=540 overlay=2 Thanks in advance -- Sent from: <a href="http://gstreamer-devel.966125.n4.nabble.com/" rel="noreferrer" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank">gstreamer-devel@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div></div>