Time axis value is coming wrong

[CherukuriNaveen]

I am able to draw different plots for tracers interlatency, proctime and etc.
But in all plot diagrams, I am getting time axis wrong.

In example diagram : https://developer.ridgerun.com/wiki/index.php?title=File:Test_proctime_plot.png, I could see time scale is 0, 0.5sec, 1sec, 1.5sec and so on.

But when I plot, I am getting time axis as 0, 41401, 41402, 41403 and so on.

How to get timescale like shown in your examples ?

I am using Ubuntu version : 18.04
Gstreamer : 1.16

Thank you
Naveen

[michaelgruner]

I'm sorry for the very slow response. @mleivaf can you check on this?

[mleivaf]

Hello,

The steps in the X axis are defined automatically by the plot (plot_tracer.m#L150)

But you can force the plot to get the steps required by you. For example:

GST_SHARK_LOCATION=./proctime GST_DEBUG="GST_TRACER:7" GST_TRACERS="proctime" \ gst-launch-1.0 videotestsrc num-buffers=100 ! identity sleep-time=8500 ! tee name=t \ t. ! queue ! identity sleep-time=50000 ! fakesink \ t. ! queue ! identity sleep-time=30000 ! fakesink

Create proctime plot

./gstshark-plot proctime -p

Now you can set the X-axis step on octave console with these commands.

timestamp_max = max(max(tracer.proctime.timestamp_mat))
step=1.5 # X axis step
set(gca, 'xtick', 0:step:timestamp_max);

Also, you can add this code here: plot_tracer.m#L150 to get always the same result.

[CherukuriNaveen]

Hi @mleivaf

Thanks for your response.

When I generate tracers, created folder contains only two files like below:

• datastream
• metadata

tracers folder should contain proctime.mat ?

As I am new to matlab coding, I added above mentioned line at https://github.com/RidgeRun/gst-shark/blob/master/scripts/graphics/plot_tracer.m#L150 and it is giving error:
parse error near line 150 of file /home/naveen/video_analytics/gst_shark/master_shark/gst-shark/scripts/graphics/plot_tracer.m
syntax error

    timestamp_max = max(max(tracer.proctime.timestamp_mat)) step=1.5 # X axis step set(gca, 'xtick', 0:step:timestamp_max);

error: called from
./gstshark-plot.m at line 71 column 5

Best Regards,
Naveen.

[mleivaf]

Hi,

The proctime.mat file is created here: gstshark-plot#L133

I am not sure if these scripts work with Matlab, but based on this link: https://www.mathworks.com/help/matlab/ref/xticks.html
I think for Matlab the commands are slightly different:
timestamp_max = max(max(tracer.proctime.timestamp_mat))
step=1.5 # X axis step
xticks(0:step:timestamp_max)

I recommend using GNU Octave for your tests https://www.gnu.org/software/octave/download.html

Regards,
Manuel.