I’m testing nvenc on orin dev kit. The PSNR Y value seems never to exceed 35, and the output image looks visually darker than original image. How should I tune the nvv4l2h265enc encoder to reach at least 42 for PSNR Y? Thanks. gst-launch-1.0 filesrc location=input.mp4 ! qtdemux ! queue ! h264parse …

Hi Dane, I can’t reproduce the low brightness issue on park joy or a few sequences in Xiph.org :: Derf's Test Media Collection . I’ll try to encode my source videos with x265enc to compare with nvv4l2h265enc.

Thanks. I tested CBR and vbv, but PSNR Y still does not exceed 35. gst-launch-1.0 filesrc location=input.mp4 ! qtdemux ! queue ! h264parse ! nvv4l2decoder ! nvv4l2h265enc iframeinterval=100 control-rate=1 bitrate=1900000 vbv-size=200000 preset-level=2 num-B-Frames=2 ! h265parse ! qtmux ! filesink l…

Hi, The bitrate is set to 1.9Mbps which is not high. What is the resolution?

Resolution is 1080p. I tried 5 Mbps as well, and it’s only marginally better. Nvidia T4 GPU can reach PSNR Y 45.33 at 1.9 Mbps, while Orin is 34.28 at 1.9 Mbps and 34.44 at 5 Mbps. control-rate=0 bitrate=5000000 no vbv PSNR y:34.444062 u:48.692727 v:48.677873 average:36.123958 min:5.364043

Hi, There’s difference in hardware between desktop GPUs and Jetson platforms. It is possible to see deviation. For 1080p, please try 10Mbps. And please try the case without encoding B frames.

Thanks, I’ll check 10 Mbps without B frame, but 10 Mbps does not fit my use case of low bandwidth and high quality video encoding. Is it the hardware issue or software config issue that the output image looks visually darker? Only the Y channel has the anomaly (washed out, low brightness, seems neve…

Here are the results for 10 Mbps: control-rate=0 bitrate=10000000 preset-level=2 PSNR y:34.330782 u:49.183111 v:49.188691 average:36.021271 min:5.363668 control-rate=0 bitrate=10000000 preset-level=2 num-B-Frames=2 PSNR y:34.489819 u:49.344146 v:49.243465 average:36.179477 min:5.363834

Hi, We will try to use this input file: https://media.xiph.org/video/derf/y4m/park_joy_1080p50.y4m And compare encoding stream of x265enc and nvv4l2h265enc in 10Mbps. See if we can reproduce it first and then check with our teams.

How to improve video encoding quality?

Robotics & Edge Computing Jetson Systems Jetson AGX Orin

DaneLLL June 17, 2022, 6:29am 2

Hi,
Please set to CBR and tune virtual buffer size. Can refer to this post:
Random blockiness in the picture RTSP server-client -Jetson TX2 - #5 by DaneLLL

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How to improve video encoding quality?

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