Unexpected latency increase on video encoder with 3-camera setup

bdjukic bdjukic at gmail.com
Tue Sep 11 17:13:24 UTC 2018

Hi there,

We are running 3 camera GStreamer setup
on our NVIDIA Jetson TX2 with the following pipeline:

*gst-launch-1.0 v4l2src device=/dev/video0 ! "video/x-raw,
format=(string)UYVY, width=(int)1280, height=(int)720" ! nvvidconv
output-buffers=50 ! omxh264enc control-rate=2 bitrate=600000 !
'video/x-h264, width=1280, height=720, stream-format=(string)byte-stream' !
queue ! h264parse ! queue ! rtph264pay mtu=800 ! udpsink host=
port=5000 sync=false
The pipeline runs at *100fps*.

After triggering all three pipelines at the same time, we can observe
noticeable latency increase after 10 seconds period. We have managed to
capture this strange behavior using GST Shark:
https://1drv.ms/u/s!As2zxTr-3RwhhLFsLYWGM3dme-pdRQ . We can see that
*omxh264enc* encoder cannot keep up with the incoming frames after 10

We're confident that hardware can handle this flow, but it's rather the
GStreamer pipeline which is not optimized. 

Any ideas on how we can increase the efficiency of the hardware encoder in
our pipeline? 



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