gstreamer h264+rtmp stream, network overhead is too large

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi,

I met a confusing problem. Here is my application setup:

On TX2, my app is running this pipeline ‘rtspsrc ! queue ! rtph264depay ! h264parse ! queue ! omxh264dec ! nvvidconv ! appsink’ for connecting and decoding a rtsp stream. which is 1920x1080, 25fps, h264 encoded bitrate=4M.

And then, after processing the raw frames, my app encoded it and push out a rtmp stream. The pipeline is ‘appsrc ! videoconvert ! omxh264enc ! flvmux ! rtmpsink’. The rtmp stream is 960x540, 25fps and connected by a laptop.

I run ifstat on TX2 and got following result:

eth0               wlan0                usb0                usb1               l4tbr0      
 KB/s in  KB/s out   KB/s in  KB/s out   KB/s in  KB/s out   KB/s in  KB/s out   KB/s in  KB/s out
  549.51   4864.77      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  547.98   4977.31      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  552.00   4980.81      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  542.93   5011.51      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  544.29   4732.97      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  558.56   5039.65      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  562.99   4861.73      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  564.87   4813.34      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00
  558.69   6094.50      0.09      0.00      0.00      0.00      0.00      0.00      0.00      0.00

Which means the input rtsp stream consume 500KB/s, but the output rtmp stream consume 5000KB/s.

I’m confused and do not know why.

I tried to adjust some config of omx264enc, but didn’t work out.

Any help would be appreciated.

Tks.

2

Hi,
Can you check if the bitrate is as your expectation in running '‘appsrc ! videoconvert ! omxh264enc ! flvmux ! filesink’? It looks like the bitrate is 4Mbps, which is default setting.