Performance on Jetson NX

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

According to the specs here

A Nvidia Jetson NX should be able to handle 6 4k streams at 60fps.

I have a hevc file thats 4k@60, YUV420, and 10 seconds long. With 3 streams, it runs at 12ms per frame, or around 80fps. When im running it 6 times at once, i only get 40fps. Why is that? The specs above say i should be able to get 4k60fps. Power mode is set to max, i have a reComputer from seed, its not a dev kit (no sd card slot). So what else could be going on here?

Running with sample 14_multivideo_decode
./multivideo_decode num_files 6 ./test_4k.hevc H265 ./test_4k.hevc H265 ./test_4k.hevc H265 ./test_4k.hevc H265 ./test_4k.hevc H265 ./test_4k.hevc H265 --disable-rendering --input-nalu --stats

output stats

Stream = ./test_4k.hevc
Total Profiling time = 14.7083
Average FPS = 40.7252
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = ./test_4k.hevc
Total Profiling time = 14.7519
Average FPS = 40.6049
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = ./test_4k.hevc
Total Profiling time = 14.7638
Average FPS = 40.5721
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = ./test_4k.hevc
Total Profiling time = 14.7519
Average FPS = 40.605
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = ./test_4k.hevc
Total Profiling time = 14.59
Average FPS = 41.0556
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = ./test_4k.hevc
Total Profiling time = 14.7644
Average FPS = 40.5706
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
3

Hi,
Please share which release you are using. Do you use Jetpack 5.1(r35.2.1) or 4.6.3(r32.7.3)?

4

5.1 Flashed it a week ago

5

Hi,
Please generate the h265 stream and give it a try:

$ gst-launch-1.0 videotestsrc num-buffers=566 ! video/x-raw,width=3840,height=2160 ! nvvidconv ! nvv4l2h265enc ! h265parse ! video/x-h265,stream-format=byte-stream ! filesink location=test_4k.hevc

We can see each decoding thread achieve 60 fps:

*****************************************
Stream = /home/nvidia/test_4k.hevc
Total Profiling time = 8.49493
Average FPS = 66.5103
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = /home/nvidia/test_4k.hevc
Total Profiling time = 8.57538
Average FPS = 65.8863
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = /home/nvidia/test_4k.hevc
Total Profiling time = 8.58453
Average FPS = 65.8161
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = /home/nvidia/test_4k.hevc
Total Profiling time = 8.56833
Average FPS = 65.9405
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = /home/nvidia/test_4k.hevc
Total Profiling time = 8.54018
Average FPS = 66.1579
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************
*****************************************
Stream = /home/nvidia/test_4k.hevc
Total Profiling time = 8.55264
Average FPS = 66.0615
Average latency(usec) = 0
Minimum latency(usec) = 18446744073709551615
Maximum latency(usec) = 0
*****************************************

Please execute sudo jetson_clocks before the test.

6

Wow! That fixed it. Whats going on here? Was my QP to low or something?

7

Hi,
It looks like the test h265 stream you use is more complex, so the decoder takes longer time in decoding each frame.