<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""></div><blockquote type="cite" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class="Apple-interchange-newline"><br class=""><blockquote type="cite" class=""><div class="">On 18 Aug 2021, at 7:21 am, James via gstreamer-devel <<a href="mailto:gstreamer-devel@lists.freedesktop.org" class="">gstreamer-devel@lists.freedesktop.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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; float: none; display: inline !important;">On 17 Aug 2021, at 5:25 am, Yu You via gstreamer-devel <</span><a href="mailto:gstreamer-devel@lists.freedesktop.org" class="" style="font-family: Helvetica; font-size: 24px; 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;">gstreamer-devel@lists.freedesktop.org</a><span class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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; float: none; display: inline !important;">> wrote:</span><br class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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 class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><blockquote type="cite" class=""><br class="Apple-interchange-newline"><div class=""><div dir="auto" class=""><div class="">Did you try to get the raw frames from your webcam and use SW/HW H264 encoder to encode it for the muxer?</div><div dir="auto" class=""><br class=""></div><div dir="auto" class="">or allow "leacky" to the audio queue?</div><div dir="auto" class=""><br class=""></div><div dir="auto" class="">Yu<br class=""><br class=""><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Mon, 16 Aug 2021, 15:46 James via gstreamer-devel, <<a href="mailto:gstreamer-devel@lists.freedesktop.org" class="">gstreamer-devel@lists.freedesktop.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div class="" style="word-wrap: break-word; line-break: after-white-space;"><br class="" style="font-family: Helvetica; font-size: 24px; 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; text-decoration: none;"><br class=""><blockquote type="cite" class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;">Utter frustration:<br class=""><br class="">I have a script<br class=""><br class="">#! /bin/bash<br class=""><br class="">GST_DEBUG_DUMP_DOT_DIR=/home/jam/DOT gst-launch-1.0 $@ v4l2src device=/dev/video2 ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>video/x-h264,width=1920,height=1080,framerate=30/1 ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>h264parse ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>tee name=t \<br class=""><span class="" style="white-space: pre-wrap;"> </span>t. ! queue ! avdec_h264 ! xvimagesink sync=false \<br class=""><span class="" style="white-space: pre-wrap;"> </span>t. ! queue ! avdec_h264 ! xvimagesink sync=true \<br class=""><span class="" style="white-space: pre-wrap;"> </span>t. ! queue max-size-buffers=0 max-size-bytes=0 max-size-time=1000000000 ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>mux. pulsesrc device=0 ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>queue ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>audioconvert ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>audioresample ! audio/x-raw, rate=16000 ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>queue ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>avenc_aac ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>queue ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>mux. mp4mux name=mux ! \<br class=""><span class="" style="white-space: pre-wrap;"> </span>filesink location=try9.mp4<br class=""><br class="">and a C version that behaves pretty much identically.<br class=""><br class="">Running the script on its own I have never seen it fail.<br class="">My app is a QT5 gui. Running my app AND the script OR the compiled version by QProcess sometimes fails with the dreaded pulsesrc underflow, downstream consuming too slowly message.<br class="">If it fails, it always fails until reboot.<br class=""><br class="">htop shows cpu usage of 10..30% 5..6G ram as cache and 0 swap being used.<br class="">gnome-system-monitor shows no spikes in cpu usage.<br class="">In desperation I swapped my 2 core i3 for a 4 core i7. Behaviour was the same.<br class=""><br class="">At other times it works for hours, many times in a row.<br class=""><br class="">What measurements might I make that may lead me to the problem.<br class=""><br class="">Needless to say if I leave the tee multiplex (and hence pulsesrc) out of the pipline then it never fails.<br class="">I've tried mp4mux, qtmux and (by accident) mpegtsmux without any change being visible. I tried matuska but that fails everytime.</blockquote><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote><br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>This gets more outlandish:<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>App->record: error after 25sec<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>App->quit<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>Script->record: all ok<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>App->start<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>Script stop<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>App->record: all ok<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>Repeatable, tried lots of times !!!<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>Note<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>App->record: error<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>App->idle<br class=""><blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;"></blockquote>Script->record: error every time.<br class=""><span class="" style="font-family: Helvetica; font-size: 24px; 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; text-decoration: none; float: none; display: inline !important;">cpu usage never goes over 40%</span><br class=""></blockquote><br class=""><div class="">On the chance someone recognises detail I post. This is playing a *bad* file:</div><div class=""><br class=""></div><div class=""><div class="">VLC error list</div><div class=""><br class=""></div><div class="">[00007fd5accd5840] main decoder error: Could not convert timestamp 2456057878 for FFmpeg</div><div class="">[00007fd5accd5840] main decoder error: Timestamp conversion failed (delay 1000000, buffering 100000, bound 9000000)</div><div class="">[00007fd5accd5840] main decoder error: Could not convert timestamp 2456093211 for FFmpeg</div><div class=""><br class=""></div><div class="">MPlayer error list</div><div class=""><br class=""></div><div class="">libavformat file format detected.</div><div class="">[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa17f53b7a0]Protocol name not provided, cannot determine if input is local or a network protocol, buffers and access patterns cannot be configured optimally without knowing the protocol</div><div class="">[lavf] stream 0: video (h264), -vid 0</div><div class="">==========================================================================</div><div class="">AO: [pulse] 16000Hz 2ch floatle (4 bytes per sample)</div><div class="">Starting playback...</div><div class="">Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.</div><div class=""><br class=""></div><div class="">Possibly bad interleaving detected.</div><div class="">Use -ni option if this causes playback issues and avoid or fix the program that created the file.</div><div class="">A: 153.6 V: 163.6 A-V: -9.965 ct: -0.587 0/ 0 53% 1% 0.2% 0 0</div><div class=""><br class=""></div></div><div class="">Still trying to find out what happens when the system is in *bad* mode vs *good* mode</div></div></blockquote></div></div></div></div></blockquote><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">OK lots of testing: here are some answers since the irony of the title must intrigue</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">First I wrote my recording code as a daemon (to sever all links to the app)</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">now on an clean system dvrRecord always works</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">With QT app running dvrRecord always fails</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">With a clean system dvrRecord then App works and continues working.</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">after App dvrRecord always works</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">The only way (there may be others I don't see) that I see the App having on dvrRecord is address in memory that is being used, but by magic smoke every process has memory from 0..NNNN no matter where in physical memory the process resides. The obvious question: I repeat the results on completely different hardware.</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">The time to fail is always 26 secs into the recording:</div><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; 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;">soundsoundsound<click>0.5secsound 0.5sec_pause 0.5secsound 0.5sec_pause . . .</div></div></blockquote><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">Oh Thai island he mentioned quite stridently!!! (that is a polite and subtle way of swearing)</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">I changed distro. I had been using Suse 15.2 and 15.3 to lubuntu 20.04 and all problems wafted away.</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">Sound and video are good and clean !!</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">I'm curious and will try to hunt down. I'll start building from src</div></blockquote><div class=""><br class=""></div>On the grounds this may help someone (It sure would have saved me weeks)<div class=""><br class=""></div><div class="">SuSE Leap 15.2 and 15.3 use old gstreamer (1.16) that does NOT work. After 35 secs the audio stutters - this is very intricate - stand alone it does work, but if a QT app *even totally unrelated* (I know that's impossible, but it is true !) runs then trouble.</div><div class=""><br class=""></div><div class="">Suse tumbleweed, manjano (arch), ununtu and fedora all using 1.18 all work<br class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 24px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">James</div></div></body></html>