How to run multimedia examples on Duo256m running v2 firmware?

Duo
1

Hi,

I’m trying to run OpenCV Mobile example, as well as examples from duo-multimedia-examples repo on Duo256m running v2 firmware.

While they are compiled without issue, when run on device, they fail due to missing library and shared library incompatibility

Here is output from opencv_mobile_test

opencv-mobile MIPI CSI camera with cvi
Error loading shared library /mnt/system/lib/libvpu.so: No such file or directory
Error loading shared library /mnt/system/lib/libvpu.so: No such file or directory
opencv-mobile HW JPG decoder with cvi
Error loading shared library /mnt/system/lib/libvpu.so: No such file or directory
cannot find v4l device with VIDEO_CAPTURE and STREAMING
320 x 240
Trace/breakpoint trap

lipvpu seems not present in buildroot_v2 sdk at all.

Other shared libraries from /mnt/system/usr/lib/ seems to be incompatible with versions used to build examples. Here is output from video_recorder sample

Error loading shared library libvpu.so: No such file or directory (needed by ./videoRecorder)
Error relocating /mnt/system/usr/lib/libsample.so: CVI_VI_SetDevBindPipe: symbol not found
Error relocating /mnt/system/usr/lib/libsample.so: CVI_RGN_GetCanvasInfo: symbol not found
Error relocating /mnt/system/usr/lib/libsample.so: CVI_RGN_Create: symbol not found
Error relocating /mnt/system/usr/lib/libsample.so: CVI_VO_EnableChn: symbol not found
Error relocating /mnt/system/usr/lib/libsample.so: CVI_RGN_Destroy: symbol not found
Error relocating /mnt/system/usr/lib/libsample.so: CVI_VO_SetDisplayBufLen: symbol not found

Any suggestions how to fix this, especially how to get missing libvpu.so for v2 firmware?

Thank you in advance

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2

Ok, let me try to answer myself.

So, according to the sources in cvi_mpi in V2 SDK, the camera stuff has been somewhat refactored. Like, there used to be a libvpu lib, but now it’s split into libvpss and libvi.

But, unfortunately, OpenCV-Mobile (even the latest version) doesn’t know about this change. So, when you try to run a sample that’s been built with a precompiled OpenCV-Mobile, it fails.

I made a patch to fix that and recompiled OpenCV-Mobile. Then I ran the image stitching example and it worked!

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3

is it riscv or arm64 os of v2 that you are running?

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4

Hi,

I use riscv firmware

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