How to I enable latencytracer in Python?

[Michael]

Hello gentlemen,

me again ...

I just did this before Gst.init()

os.environ["GST_DEBUG"] = "GST_TRACER:7"
os.environ["GST_TRACERS"] = "latency(flags=element)"

But nothing happens in the stdout. 🤷‍♂️

If I try

Gst.debug_set_active(True)
Gst.debug_set_default_threshold(7)
os.environ["GST_TRACERS"] = "latency(flags=element)"

I get all the Traces as expected even without setting the GST_TRACERS env ?

I am a bit confused what should I see in the stdout if that would work?

Thanks, Michael



Am So., 3. Mai 2020 um 15:52 Uhr schrieb Nicolas Dufresne <
nicolas at ndufresne.ca>:

>
>
> Le dim. 3 mai 2020 06 h 30, Tim-Philipp Müller <t.i.m at zen.co.uk> a écrit :
>
>> On Sat, 2020-05-02 at 17:00 -0400, Nicolas Dufresne wrote:
>>
>>
>> There is currently no API to the tracers, this is something we should do, we we
>>
>> already have few bits marked as unstable API because their API isn't yet in a
>>
>> shape we are confident to freeze it.
>>
>>
>> From the time being, you need to set the env before starting the process or do
>>
>> this before calling Gst.init():
>>
>>
>> 	os.environ["GST_TRACERS"] = "latency(flags=element)"
>>
>>
>> There is no way to turn on and off at run-time for now.
>>
>>
>> FWIW, we do have API access for tracers in git master, e.g. the leak
>> tracer can be accessed via GObject API after retrieving it via
>> gst_tracing_get_active_tracers(), to do snapshotting etc. So could
>>
>> add something similar to other tracers if we wanted to and it seems
>>
>> useful.
>>
>>
> Yes, though the leak tracer still need to be activated by env iirc. The
> leak tracer can only work if it's enabled before gst_init(). While some
> other tracers, like latency tracer could with some API be activated and
> deactivated completely at runtime (without paying an overhead when
> deactivated). Just saying, as it would be sad to use the same API for these
> two cases.
>
>>
>> Cheers
>>
>>  Tim
>>
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>>
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