How to set the frame rate on imx678 camera?

[steely-glint]

Which system do you use? Android, Ubuntu, OOWOW or others?

UBuntu

Which version of system do you use? Please provide the version of the system here:

Linux v-stream-npu 5.15.137 #1.7.5 SMP PREEMPT Thu Sep 25 20:37:29 CST 2025 aarch64 aarch64 aarch64 GNU/Linux

Please describe your issue below:

We are getting good results from the new imx768 sensor on VIM4 with NPU.
But I can’t find a way to set the frame rate on the imx678 sensor. It defaults to 60fps.
What is the recommended way to set this to 30fps ?

The example code in v4l2_test_raw.cpp doesn’t show how.

Post a console log of your issue below:

[numbqq]

@steely-glint

What is the recommended way to set this to 30fps ?

You have to modify the source code at this moment.

[steely-glint]

Is this the driver source code? Or a Library? Or the demo app? I can’t see a method I can call to set the frame rate in the APIs the v4l2_test_raw uses. Can you please give me a hint where to look?

In the meantime I have a work-around where I drop half the frames before passing them to the encoder, which works but is inefficient and ugly

[Electr1]

@steely-glint it’s part of the imx678 init driver code, you’ll have to modify the registers responsible for the frame rate (vts timing probably) according to the datasheet

https://github.com/khadas/common_drivers/blob/khadas-vims-5.15.y/drivers/amlisp/amlsens/imx678/aml_imx678.h

You’ll have to modify these when building the kernel with fenix