Print processing latency

[Nicolas Dufresne]

Le lundi 25 mars 2019 à 23:25 +0530, Saurabh Bora a écrit :
> Ah..My Bad!!Thanks for pointing it out Nicolas. I was able to see GST_TRACER logs
> 
> Actually, I am working on finding out latency for different elements in a live gstreamer pipeline which looks something like below:
> v4l2src ! videoconvert ! vp8enc ! webrtcbin

I'd be really happy if you give a try on what m y Colleague and I have been working on for a while. It's a enhancement of the latency trace to add per-element effective latency and also reported latency. With that you should be able to see if an element is using more latency when it's max reported latency allow. Meanwhile, I can give you a hint, vp8enc has variable latency, unless you set the dealine= property. That assumes you're CPU is fast enough.
https://gitlab.freedesktop.org/gstreamer/gstreamer/merge_requests/118
> As I am expecting to see output on the browser, I also need to find out end to end latency, from source(live camera feed) to destination(web browser). I believe enabling the environment variables would not suffice in this scenario.
> Thanks and Regards,
> Saurabh Bora
> On Mon, Mar 25, 2019, 22:49 Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> > Le lundi 25 mars 2019 à 22:16 +0530, Saurabh Bora a écrit :
> > 
> > > Hi, 
> > 
> > > 
> > 
> > > I followed the link https://gstreamer.freedesktop.org/documentation/design/tracing.html#print-processing-latencies, set the environment variables and ran the pipeline as follows:
> > 
> > > //--------------------------------------------------------------------------------------------------------------------------------
> > 
> > > export GST_DEBUG="GST_TRACERS:7"
> > 
> > 
> > 
> > I'm sorry for this, but there is no S to that debug section (/o\)
> > 
> > 
> > 
> > > export GST_TRACERS=latency
> > 
> > > gst-launch-1.0 audiotestsrc num-buffers=10 ! audioconvert ! volume volume=0.7 ! autoaudiosink
> > 
> > > 
> > 
> > > Output:
> > 
> > > Setting pipeline to PAUSED ...
> > 
> > > Pipeline is PREROLLING ...
> > 
> > > Redistribute latency...
> > 
> > > Pipeline is PREROLLED ...
> > 
> > > Setting pipeline to PLAYING ...
> > 
> > > New clock: GstAudioSinkClock
> > 
> > > Got EOS from element "pipeline0".
> > 
> > > Execution ended after 0:00:00.237344143
> > 
> > > Setting pipeline to PAUSED ...
> > 
> > > Setting pipeline to READY ...
> > 
> > > Setting pipeline to NULL ...
> > 
> > > Freeing pipeline ...
> > 
> > > //----------------------------------------------------------------------------------------------
> > 
> > > 
> > 
> > > The above output is exactly the same as the output that I get when environment variables are not set.
> > 
> > > Am I missing something here? What output must I expect?
> > 
> > > 
> > 
> > > Help Appreciated...
> > 
> > > 
> > 
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> > 
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> > 
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> > 
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> > 
> > 
> > 
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