Nvv4l2h264enc latency and preset-level

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
3

Hi,
The test result is dependent to resolution and frame rate. If you would like to achieve 4Kp30 encoding , you only can set to UltraFastPreset. If your use-case is single 1080p30 encoding, you may set to other preset to get better image quality.

So if you run 4K encoding and compare the preset levels, should see different result and fps.

We don’t have test data for latency. For achieving low latency, suggest you set the properties:

  poc-type            : Set Picture Order Count type value
                        flags: readable, writable, changeable only in NULL or READY state
                        Unsigned Integer. Range: 0 - 2 Default: 0
  maxperf-enable      : Enable or Disable Max Performance mode
                        flags: readable, writable, changeable only in NULL or READY state
                        Boolean. Default: false

For encoding into I P P P … frames, encoder would need to keep one reference frame so you should see one-frame delay. If your source is in 30fps, there is 33ms latency.