I have AGX Orin and use NvVideoEncoder API to do HEVC encoding. I like to enable ROI encoding. I have the following questions on ROI encoding: How many ROIs can be defined? How to enable it and how to specify ROI parameters? Is there a C++ sample code of ROI encoding available? Thanks

There is no update from you for a period, assuming this is not an issue anymore. Hence, we are closing this topic. If need further support, please open a new one. Thanks ~1105 Is this still an issue to support? Any result can be shared?

Danelll I am able to see ROI encoding working with this exmaple on my Orin: [image] How to use ROI encoding on XavierNX Jetson Xavier NX I want to use ROI encoding, and try it base on the tegra_multimedia_api/samples/01_video_encode. I run the sample code as…

Hi, Please disable slice level encoding in your application and check if ROI encoding works.

Is quite difficult to disable slice_encoding for me. Can you show me how to enable slice encoding on 01_video)encode to verify roi encoding still works not? Also I found v4l2_buf.index value didn’t increase in my app as the one in 01_video_encode. why is that?

danelll, ROI on 01_video_encode still works OK with slice encoding enabled

Hi, You may refer to 01 sample to debug your application.

I will review 01 sample code craefully. I have another question of encoder HW presets. There are 4 Presets on AGX Orin, as below: V4L2_ENC_HW_PRESET_ULTRAFAST; V4L2_ENC_HW_PRESET_FAST; V4L2_ENC_HW_PRESET_MEDIUM; V4L2_ENC_HW_PRESET_SLOW; Where can I find definitions of 4 presets? I want to cr…

[image] fcj: V4L2_ENC_HW_PRESET_FAST; Danelll The reason I am asking for these 4 presets is because I found V4L2_ENC_HW_PRESET_FAST is not realtime for 5760x1080. I want to refine V4L2_ENC_HW_PRESET_FAST settings to make it run realtime FC

Hi, The presets are hard defined and cannot be customized. If setting to V4L2_ENC_HW_PRESET_FAST cannot meet the target performance, please set to V4L2_ENC_HW_PRESET_ULTRAFAST.

Yes, I am currently using V4L2_ENC_HW_PRESET_ULTRAFAST, but the quality is not good enough. I am hoping V4L2_ENC_HW_PRESET_FAST can improve video quality.. Unfortunely, it is not realtime for 5760x1080 at 30fps. What I want to know the difference of the following items between ULTRAFAST and FAST …

Roi encoding

Robotics & Edge Computing Jetson Systems Jetson AGX Orin

DaneLLL October 8, 2025, 7:48am 22

Hi,
Performance and image quality are tradeoff. You would need to use V4L2_ENC_HW_PRESET_ULTRAFAST. One more thing you may try is to configure CBR + virtual buffer size. Please refer to the example:
Random blockiness in the picture RTSP server-client -Jetson TX2 - #5 by DaneLLL

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Roi encoding

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