AM69A: How to measure latency between capture frame and playback frames

Chinmaya Kumar Samal

Part Number: AM69A

I am benchmarking few things like frame rate(fps), total time, total inference time etc using python app under apps_python as ti documented.

Is there a way to measure latency?

Basically, we wanted to measure latency between capturing of frames to playback those frames with or without remote sink.

For more info, as of now we configure h264/h265 video files as Input and output as saving files into .mkv/.mov/.mp4. Please have a look below screen for more details

similar way we tried to be figured out measuring of latency with or without remote sinks.

In simpler words, we want to measure latency between capture frame and playback frames with or without dl-inference.

Kindly help on this. Thanks

over 1 year ago

0 Takuma Fujiwara over 1 year ago

TI__Guru 51823 points

Hi Chinmaya,

I would recommend reading through the Parse GST Tracers section in our AM69A SDK documentation: https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-am69a/09_01_00/exports/edgeai-docs/common/measure_perf.html#parse-gst-tracers

This tool gives out the latency for a GStreamer pipeline (which is the back end of our Python application demo), and it gives it out at a GStreamer element-wise granularity.

Regards,

Takuma

0 Chinmaya Kumar Samal over 1 year ago in reply to Takuma Fujiwara

Prodigy 40 points

Thank you very much Takuma

0 Chinmaya Kumar Samal over 1 year ago in reply to Chinmaya Kumar Samal

Prodigy 40 points

Hi Takuma,

Please find the below screen, as per GST Tracer guidelines.

Kindly help to provide bit of understanding on out-latancy & latency, what does it exactly mean, can we have latency measured on v4l2h264enc? ya I understand that information is getting from GST debug logs which are very difficult to interpret in the raw format.

Thanks,

Chinmaya.

0 Takuma Fujiwara over 1 year ago in reply to Chinmaya Kumar Samal

TI__Guru 51823 points

Hi Chinmaya,

The latency field is how long it takes for a frame that was captured at timestamp 0 to reach the end of the element. The out-latency is the final latency between each frame to achieve the out-fps (in the screenshot, 33.06 ms = 40 FPS). Frames is how many frames the element has processed.

Regards,

Takuma

0 Chinmaya Kumar Samal over 1 year ago in reply to Takuma Fujiwara

Prodigy 40 points

ya got it, Thanks Takuma.

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AM69A: How to measure latency between capture frame and playback frames