Latency query failed

Joe · November 20, 2023, 9:51pm

0:00:00.041924546 2287421 0x562c1ea8a980 WARN aggregator gstaggregator.c:2149:gst_aggregator_query_latency_unlocked:<amix> Latency query failed
0:00:00.041947274 2287421 0x562c1ea8a980 WARN aggregator gstaggregator.c:2149:gst_aggregator_query_latency_unlocked:<mux> Latency query failed

mux is a flvmux element and amix is an audio mixer. What can cause this problem? And how to debug?

The pipeline is as follows(gstreamer 1.22.7):
flvmux streamable=true name=mux ! rtmpsink location=“*** app=live2” ximagesrc use-damage=0 show-pointer=0 endx=*** endy=*** ! queue ! vapostproc ! vah264enc rate-control=vbr bitrate=1500 target-usage=7 ! h264parse ! mux. audiomixer name=amix. …

Joe · November 20, 2023, 10:55pm

is my problem similar to this one?

github.com/teltek/gst-plugin-ndi

Latency query failed

opened 03:47PM - 06 Mar 19 UTC

closed 03:09PM - 30 Jul 19 UTC

o-reo

In the case where the NDI receiver does not return the expected frame type or do…es not get any frame the latency query fails. example pipeline, note that the NDI stream only sends video frame : ``` gst-launch-1.0 flvmux name=mux ! filesink location=test.flv ndivideosrc stream-name='HARDWARE (Video)' ! videoconvert ! x264enc ! queue ! mux. ndiaudiosrc stream-name='HARDWARE (Video)' ! audioconvert ! audioresample ! queue ! mux. ``` As the latency is not calculated, the muxer does not process the video frames as it waits indefinitely for the audio frames. when setting debug env with export `GST_DEBUG=flvmux:6,aggregator:6` you get the following line: ``` 0:00:03.041833501 25540 0x55f53f270b70 WARN aggregator gstaggregator.c:1715:gst_aggregator_query_latency_unlocked:<mux> Latency query failed ``` I assume setting a default latency other than none should solve the problem ? It may also be due to the infinite loop in fixate functions.

The same pipeline runs fine with vaapipostproc and vaapih264enc

Joe · November 20, 2023, 11:06pm

More issues here.
https://gstreamer-bugs.narkive.com/AWL8MTRg/bug-753780-new-latency-query-failed-from-audiomixer-linked-to-audiotestsrc

Is the bug fixed or reintroduced by va video encoder?

Joe · November 23, 2023, 3:11pm

Any helps? Nobody had this problem before?