Pipeline latency

[Nicolas Dufresne]

Le mardi 13 mars 2018 à 17:30 +0100, José Rafael a écrit :
> Hi All
> 
> I need a way to estimate the latency inserted by the pipeline, from
> source to sink.
> One source and one sink on each case.
> One way I found was with tracers, but when using it with filesrc I
> get a segmentation fault (trace below).
> 
> Would you suggest another way to get this information?
> 
> Rebuilding the packages is also an option.

It should not crash, but you'd need to give more information to allow
reproducing or debugging.

> 
> Thanks for any help or advice.
> 
> Best Regards
> Rafael
> 
> ---
> GST_DEBUG="GST_TRACER:7" GST_TRACERS=latency ./encoder --dst-
> host=127.0.0.1 --dst-port=10200  --vid-
> filename=/root/Sample_1280x720.yuv  --vid-width=1280  --vid-
> height=720  --vid-frame-rate=25 --dst-plain
> (...)
> 0:00:00.023130186 18340      0x1ebaa30 DEBUG             GST_TRACER
> gsttracer.c:163:gst_tracer_register:<registry0> update existing
> feature 0x1cf81b0 (latency)
> 0:00:00.023173239 18340      0x1ebaa30 DEBUG             GST_TRACER
> gsttracer.c:163:gst_tracer_register:<registry0> update existing
> feature 0x1cf8270 (log)
> 0:00:00.023186850 18340      0x1ebaa30 DEBUG             GST_TRACER
> gsttracer.c:163:gst_tracer_register:<registry0> update existing
> feature 0x1cf8330 (rusage)
> 0:00:00.023199345 18340      0x1ebaa30 DEBUG             GST_TRACER
> gsttracer.c:163:gst_tracer_register:<registry0> update existing
> feature 0x1cf83f0 (stats)
> 0:00:00.023234725 18340      0x1ebaa30 TRACE             GST_TRACER
> gsttracerrecord.c:110:gst_tracer_record_build_format: latency.class,
> src=(structure)"scope\,\ type\=\(GType\)NULL\,\ related-
> to\=\(GstTracerValueScope\)GST_TRACER_VALUE_SCOPE_PAD\;",
> sink=(structure)"scope\,\ type\=\(GType\)NULL\,\ related-
> to\=\(GstTracerValueScope\)GST_TRACER_VALUE_SCOPE_PAD\;",
> time=(structure)"value\,\ type\=\(GType\)NULL\,\
> description\=\(string\)\"time\\\ it\\\ took\\\ for\\\ the\\\
> buffer\\\ to\\\ go\\\ from\\\ src\\\ to\\\ sink\\\ ns\"\,\
> flags\=\(GstTracerValueFlags\)GST_TRACER_VALUE_FLAGS_AGGREGATED\,\
> min\=\(guint64\)0\,\ max\=\(guint64\)18446744073709551615\;";
> 0:00:00.023289384 18340      0x1ebaa30 DEBUG             GST_TRACER
> gsttracerrecord.c:124:gst_tracer_record_build_format: new format
> string: latency, src=(string)%s, sink=(string)%s, time=(guint64)%lu;
> 
> (encoder:18340): GLib-GObject-WARNING **: g_object_set_valist: passed
> '0' as denominator for `GstFraction'
> Starting playback
> Running...
> MSG:1520958248814309:state-changed:enc_tx_sink:NULL->READY
> MSG:1520958248814326:state-changed:enc_tx_rtppay:NULL->READY
> MSG:1520958248814341:state-changed:enc_tx_enc:NULL->READY
> MSG:1520958248814353:state-changed:enc_tx_videoparse:NULL->READY
> MSG:1520958248814366:state-changed:enc_tx_src:NULL->READY
> MSG:1520958248814380:state-changed:tx:NULL->READY
> MSG:1520958248814397:state-changed:enc_tx_rtppay:READY->PAUSED
> MSG:1520958248814413:state-changed:enc_tx_enc:READY->PAUSED
> MSG:1520958248814434:state-changed:enc_tx_videoparse:READY->PAUSED
> MSG:1520958248814449:state-changed:enc_tx_src:READY->PAUSED
> MSG:1520958248834557:state-changed:enc_tx_sink:READY->PAUSED
> MSG:1520958248834594:state-changed:tx:READY->PAUSED
> 0:00:00.050286313 18340      0x1eed5e0 TRACE             GST_TRACER
> :0:: latency, src=(string)enc_tx_src_src,
> sink=(string)enc_tx_sink_sink, time=(guint64)10552137;
> MSG:1520958248835001:state-changed:enc_tx_sink:PAUSED->PLAYING
> MSG:1520958248835044:state-changed:enc_tx_rtppay:PAUSED->PLAYING
> MSG:1520958248835061:state-changed:enc_tx_enc:PAUSED->PLAYING
> MSG:1520958248835074:state-changed:enc_tx_videoparse:PAUSED->PLAYING
> MSG:1520958248835087:state-changed:enc_tx_src:PAUSED->PLAYING
> MSG:1520958248835103:state-changed:tx:PAUSED->PLAYING
> 
> (encoder:18340): GStreamer-CRITICAL **: gst_event_get_structure:
> assertion 'GST_IS_EVENT (event)' failed
> 
> (encoder:18340): GStreamer-CRITICAL **: gst_structure_id_get:
> assertion 'GST_IS_STRUCTURE (structure)' failed
> Segmentation fault
> ---
> 
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