OpenCV JavaCamera bug? (OpenCV 4 Android on Nexus 7)

Question

I downloaded the samples from OpenCV for Android and let them run in eclipse on a real device (Nexus 7). They all work fine, but when I'm looking at the LogCat log, I see ca 20 errors displayed for each frame. The log is filled with them. Although all the samples work, this irritates me and makes it hard to debug the code.

Here a screenshot of the log:

Does anyone know where these errors come from and what they mean? Should I worry about them, if no: can I somehow hide them? if yes: what to do?

Another question: I get, when running the JavaCameraView idle (Sample CameraPreview) only 15fps max. This is few, isn't it? Or is this always like this when using OpenCV with Java (over JNI) instead of c++?

Thanks in advance for any hints! Isa

Answer 1

The next OpenCV version will fix a few camera bugs, maybe it fixes those messages. There is one specific to Nexus 7 2013, but looks different from yours.

JavaCamera is usually slower than NativeCamera but more stable (less buggy). But it also depends from other factors like ambient light (less light = slower), chosen resolution.