[gst-devel] Real framerate display

[Aarto Matti]

Thanks, Florent.

FPS is meaningful for me to see when cpu is not able keep it at maximum, I
also need a way to measure how much performance I gain with hardware codecs.

I used handoff event as you suggested and I had to split the stream into two
with tee and feed one to fakesink. So it works :) Then I need to measure
what do I get with XV, since colorspace conversions and scaling can be done
with it. From here perhaps I can measure cpu usage, but to use FPS wouldn't
be fair, because I can't go with gstreamer beyond xvimagesink. I will study
what I can do with QoS events.

--
Aarto

On Thu, Apr 16, 2009 at 4:27 AM, Florent <fthiery at gmail.com> wrote:

> Hello
>
> > I develop a benchmark and performance test application based on
> gstreamer.
> > Is there a plugin or a way to display/output real fps from the playback.
> Any
> > other meaningful metric that can be used for evaluating performance is
> > useful also. Thanks.
>
> You could use identity (which you can insert anywhere in your
> pipeline), and connect the signals "handoff":
> * wo a callback incrementing a counter you reset every second, which
> will give you second-scale fps average measurement
> * to a callback measuring difference beween consecutive timestamps,
> which will give you instantaneous fps measure (fps will be
> 1/difference)
>
> If you are only interested in pure display/playback performance
> measurement, you could take a look at QoS events' timestamps emitted
> from sinks (see gstreamer/docs/design/part-qos.txt).
>
> For memory/cpu usage, you could use standard system calls or /proc
> parsings.
>
> I hope this helps. Maybe there are better ways to do this... Can you
> elaborate on the kind of performance you would like to measure ?
>
> Florent
>
>
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