[Bug 796438] New: audiolatency gives strange results with RTP streams

GStreamer (GNOME Bugzilla) bugzilla at gnome.org
Mon May 28 16:15:12 UTC 2018 

https://bugzilla.gnome.org/show_bug.cgi?id=796438

            Bug ID: 796438
           Summary: audiolatency gives strange results with RTP streams
    Classification: Platform
           Product: GStreamer
           Version: 1.14.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at poradnik-webmastera.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

New audiolatency element gives strange results for RTP streams. I use following
pipeline for tests:

gst-launch-1.0 audiolatency name=al print-latency=true ! audioconvert !
audioresample ! opusenc ! rtpopuspay min-ptime=20000000 max-ptime=20000000 !
rtpopusdepay ! opusdec ! audioconvert ! audioresample ! al.

* Gstreamer 1.14.0 was giving times which probably were negative:

New clock: GstSystemClock
Redistribute latency...
last latency: 17ms, running average: 17ms
last latency: 7ms, running average: 12ms
last latency: 9ms, running average: 11ms
last latency: 1ms, running average: 8ms
last latency: 1ms, running average: 7ms
last latency: 1ms, running average: 4ms
last latency: 0ms, running average: 2ms
last latency: 0ms, running average: 0ms
last latency: 0ms, running average: 0ms
last latency: 950ms, running average: 190ms
last latency: 950ms, running average: 380ms
last latency: 950ms, running average: 570ms
last latency: 952ms, running average: 760ms
last latency: 949ms, running average: 950ms
last latency: 0ms, running average: 760ms
last latency: 950ms, running average: 760ms
last latency: 951ms, running average: 760ms
last latency: 954ms, running average: 761ms
last latency: 950ms, running average: 761ms
last latency: 959ms, running average: 953ms
last latency: 950ms, running average: 953ms
last latency: 950ms, running average: 953ms
last latency: 0ms, running average: 762ms
last latency: 950ms, running average: 762ms
last latency: 950ms, running average: 760ms
last latency: 952ms, running average: 760ms
last latency: 950ms, running average: 760ms
last latency: 950ms, running average: 950ms
last latency: 950ms, running average: 950ms
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:27.180722643
Setting pipeline to PAUSED ...

* Gstreamer 1.14.1 is better, however reported time keeps increasing:

New clock: GstSystemClock
last latency: 10ms, running average: 10ms
Redistribute latency...
last latency: 2ms, running average: 6ms
last latency: 23ms, running average: 12ms
last latency: 3ms, running average: 10ms
last latency: 2ms, running average: 8ms
last latency: 3ms, running average: 7ms
last latency: 2ms, running average: 7ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 2ms, running average: 2ms
last latency: 20ms, running average: 6ms
last latency: 25ms, running average: 10ms
last latency: 21ms, running average: 14ms
last latency: 23ms, running average: 18ms
last latency: 21ms, running average: 22ms
last latency: 20ms, running average: 22ms
last latency: 22ms, running average: 21ms
last latency: 31ms, running average: 24ms
last latency: 22ms, running average: 23ms
last latency: 38ms, running average: 27ms
last latency: 25ms, running average: 28ms
last latency: 22ms, running average: 28ms
last latency: 48ms, running average: 31ms
last latency: 68ms, running average: 40ms
last latency: 79ms, running average: 48ms
last latency: 76ms, running average: 59ms
last latency: 77ms, running average: 70ms
last latency: 69ms, running average: 74ms
last latency: 71ms, running average: 75ms
last latency: 65ms, running average: 72ms
last latency: 53ms, running average: 67ms
last latency: 46ms, running average: 61ms
last latency: 25ms, running average: 52ms
last latency: 24ms, running average: 43ms
last latency: 20ms, running average: 34ms
last latency: 23ms, running average: 28ms
last latency: 35ms, running average: 25ms
last latency: 28ms, running average: 26ms
last latency: 22ms, running average: 25ms
last latency: 20ms, running average: 25ms
last latency: 38ms, running average: 28ms
last latency: 42ms, running average: 30ms
last latency: 57ms, running average: 36ms
last latency: 69ms, running average: 45ms
last latency: 75ms, running average: 56ms
last latency: 82ms, running average: 65ms
last latency: 94ms, running average: 76ms
last latency: 83ms, running average: 81ms
last latency: 102ms, running average: 87ms
last latency: 108ms, running average: 94ms
last latency: 94ms, running average: 96ms
last latency: 94ms, running average: 96ms
last latency: 93ms, running average: 98ms
last latency: 83ms, running average: 94ms
last latency: 95ms, running average: 92ms
last latency: 89ms, running average: 91ms
last latency: 79ms, running average: 88ms
last latency: 82ms, running average: 86ms
last latency: 82ms, running average: 85ms
last latency: 78ms, running average: 82ms
last latency: 76ms, running average: 79ms
last latency: 95ms, running average: 83ms
last latency: 105ms, running average: 87ms
last latency: 118ms, running average: 94ms
last latency: 126ms, running average: 104ms
last latency: 138ms, running average: 116ms
last latency: 135ms, running average: 124ms
last latency: 143ms, running average: 132ms
last latency: 145ms, running average: 138ms
last latency: 135ms, running average: 139ms
last latency: 153ms, running average: 142ms
last latency: 167ms, running average: 149ms
last latency: 175ms, running average: 155ms
last latency: 189ms, running average: 164ms
last latency: 185ms, running average: 174ms
last latency: 198ms, running average: 183ms
last latency: 207ms, running average: 191ms
last latency: 205ms, running average: 197ms
last latency: 194ms, running average: 198ms
last latency: 194ms, running average: 199ms
last latency: 209ms, running average: 202ms
last latency: 206ms, running average: 202ms
last latency: 207ms, running average: 202ms
last latency: 203ms, running average: 204ms
last latency: 200ms, running average: 205ms
last latency: 213ms, running average: 206ms
last latency: 224ms, running average: 209ms
last latency: 240ms, running average: 216ms
last latency: 222ms, running average: 220ms
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:01:37.927549255
Setting pipeline to PAUSED ...

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