AM5728: Minimizing display video latency

Hello,

Here is some suggestions:
1. Set sync=true.
2. In that pipeline the latency between receiving the packet from the
network and playing the decoded frame is determined by rtpjitterbuffer, which has a 200ms latency by default. You could check this property.
3. More of the cases the latency is caused by the sender.

BR
Margarita

Thank you for the quick reply Margarita.

1. Is there any way to measure added latency from individual elements in a gstreamer pipeline?

2. Is it possible to make Wayland/weston use double buffering instead of triple buffering to the display?

Thanks again,

Vishal

Hello,

Vishal said:

1. Is there any way to measure added latency from individual elements in a gstreamer pipeline?

Please check these links:

https://gstreamer.freedesktop.org/documentation/design/latency.html

https://gstreamer.freedesktop.org/documentation/design/tracing.html

Vishal said:

2. Is it possible to make Wayland/weston use double buffering instead of triple buffering to the display?

Refer:

https://e2e.ti.com/support/arm/sitara_arm/f/791/p/594313/2184638

BR
Margarita

Hi Margarita,

Thank you for the suggestions.

I've been able to use the tracing functionality like so to find the latency from source to sink in the pipeline.

GST_DEBUG="GST_TRACER:7" GST_TRACERS=latency gst-launch-1.0 -v rtspsrc location=rtsp://192.168.0.102/av0_1 latency=0 ! rtpjpegdepay ! jpegparse ! ducatijpegdec ! vpe ! video/x-raw, format=NV12, width=1280, height=720 ! waylandsink

However I'm receiving latency readings of ~6 ms. I do not believe the latency added by the ducatijpegdec is being accounted for. My understanding is that the ducati decoder should add about a frame of latency. Do you know how I can find the run-time latency of each element?

Here is the type of log I receive from the tracing:

0:00:05.028287245  1140   0x17e890 TRACE             GST_TRACER :0:: latency, src=(string)udpsrc0_src, sink=(string)waylandsink0_sink, time=(guint64)6156608;
0:00:05.062275469  1140   0x17e890 TRACE             GST_TRACER :0:: latency, src=(string)udpsrc0_src, sink=(string)waylandsink0_sink, time=(guint64)6304797;
0:00:05.104294220  1140   0x17e890 TRACE             GST_TRACER :0:: latency, src=(string)udpsrc0_src, sink=(string)waylandsink0_sink, time=(guint64)6077877;

Thanks again,

Vishal