nvidia TX1 gstreamer omxh265enc fps

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
1

Hi team,

I have use gstreamer pipeline as follows:

gst-launch-1.0 -v nvcamerasrc fpsRange=“30.0 30.0” ! ‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)I420, framerate=(fraction)30/1’ ! nvvidconv flip-method=2 ! ‘video/x-raw(memory:NVMM), format=(string)I420, width=(int)1920, height=(int)1080, framerate=(fraction)30/1’ ! omxh265enc bitrate=8000000 ! ‘video/x-h265, stream-format=(string)byte-stream’ ! h265parse ! rtph265pay mtu=1400 ! udpsink host=xxx port=50000 sync=false async=false

I just want to test fps about omxh265enc, no matter what fps I changed for filters, when I recive this udp stream and decode it , the fps is fixed at 25. I try to save it and use ffprobe to display some imformation about it, still 25. But encode it in a another plugin, like x265enc, it is ok.

Is any wrong about the omxh265enc source? Someone has been in trouble with the same problems?

thanks

2

Hi,
Could you tell how you check the frame rate by your command and the BSP version.
However, I could get 30 fps recording file by below command with r24.2

gst-launch-1.0 -v nvcamerasrc num-buffers=200 fpsRange=“30.0 30.0” ! ‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)I420, framerate=(fraction)30/1’ ! nvvidconv flip-method=2 ! ‘video/x-raw(memory:NVMM), format=(string)I420, width=(int)1920, height=(int)1080, framerate=(fraction)30/1’ ! omxh265enc bitrate=8000000 ! ‘video/x-h265, stream-format=(string)byte-stream’ ! h265parse ! matroskamux ! filesink location= ch265.mp4

3

Hi,

I use ffprobe xxx to show the fps about it and the BSP version is R24.2 . I have test the command you give, it could get 30 fps recording file, but when I delete the plugin matroskamux, the fps I get is still 25, why?

4

We are testing H.264 encoder for a 4k/30fps stream server.
Unfortunately, we have not yet see 30fps, it was about 22fps.

Our environment:

  • R24.1 32bit / 64bit
  • Input: USB 3.0, 3840P, I420
  • Output: UDP/RTP (Same element: udpsink)
5

Does the local encoder can reach 30 fps for H.264 encoder? If the local encoder can get 30 fps the maybe the bottleneck is network or something else.

6

Hi ShaneCCC,

I’m waiting for some advices or suggestions.
[url]https://devtalk.nvidia.com/default/topic/966938/jetson-tx1/how-to-achieve-the-h-264-encoding-performance-4k-3-840x2-160-30fps-with-openmax-il-api-l4t-r24-1/[/url]

If we cannnot do it via the OpenMAX IL API without GStreamer and can with new API or GStreamer,
I have to re-design our prototype with new multimedia API and L4T R24.2 as soon as possible.

7

Hi mynaemi
Due to USB camera can’t use NVMM buffer that means the memory copy is necessary and it really heart the performance.

8

Hi ShaneCCC@nVIDIA,

Thanks your comments.

My question is about H.264/4k, let’s move to,
[url]https://devtalk.nvidia.com/default/topic/966938/jetson-tx1/how-to-achieve-the-h-264-encoding-performance-4k-3-840x2-160-30fps-with-openmax-il-api-l4t-r24-1/?offset=9[/url]

Best Regards,

9

Hi Cloundliu,
Could you check the timestamp with the command?

gst-launch-1.0 nvcamerasrc num-buffers=200 fpsRange=“30.0 30.0” ! ‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)I420, framerate=(fraction)30/1’ ! nvvidconv flip-method=2 ! ‘video/x-raw(memory:NVMM), format=(string)I420, width=(int)1920, height=(int)1080, framerate=(fraction)30/1’ ! omxh265enc bitrate=8000000 ! ‘video/x-h265, stream-format=(string)byte-stream’ ! filesink location=/tmp/a.h265 --gst-debug=omx*:5 &> a.log

cat a.log | grep ‘Handling buffer’

You should get the timestamp info of each frame:
0:00:06.885365241 17135 0x7f680022d0 DEBUG omxvideoenc gstomxvideoenc.c:1175:gst_omx_video_enc_loop: Handling buffer: 0x00000050 6708120

0:00:06.917328737 17135 0x7f680022d0 DEBUG omxvideoenc gstomxvideoenc.c:1175:gst_omx_video_enc_loop: Handling buffer: 0x00000050 6741340

For 30fps, the timestamp difference should be ~33000us.

10

Hi Cloundliu,
Please also check the execution time via the command:
gst-launch-1.0 -v nvcamerasrc num-buffers=300
fpsRange=“30.0 30.0” ! ‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)I420, framerate=(fraction)30/1’ ! nvvidconv flip-method=2 ! ‘video/x-raw(memory:NVMM), format=(string)I420, width=(int)1920, height=(int)1080, framerate=(fraction)30/1’ ! omxh265enc bitrate=8000000 ! ‘video/x-h265, stream-format=(string)byte-stream’ ! filesink location= ch265.265 -e

Execution ended after 0:00:10.158500534

For 300 frames the execution time is ~10 sec, the frame rate is ~30fps