SurfaceTexture updateTexImage to shared 2 EGLContexts - Problems on Android 4.4

Question

I am referring to this excellent example of how to encode the preview frames of the camera directly into an mp4 file: http://bigflake.com/mediacodec/CameraToMpegTest.java.txt I have adopted the code in the way that I also would like to render the preview image on the screen. Therefore I got something like a GLTextureView with its own EGLContext. This Context is then used as shared EGLContext when I create the EGLContext for the encoder rendering: ``` mEGLContext = EGL14.eglCreateContext(mEGLDisplay, configs[0], sharedContext == null ? EGL14.EGL_NO_CONTEXT : sharedContext, attrib_list, 0); ``` In my render-loop I followed the tip of fadden... for every frame I do the following: - first I wait for the new image to arrive on the SurfaceTexture with awaitNewImage() - then I set the GLTextureView's context current and render the frame on it - after that I set the encoders context current and render the frame on it This looks something like that: ``` mFrameWatcher.awaitNewImage(); mSurfaceT…

Accepted Answer

It appears this is in fact the same problem as this question. I put some details there; in short, you should be able to fix it by un-binding and re-binding the texture, which is essentially what you're doing with the awkward attach/detach sequence.

In my code, I was able to fix it by changing this:

```
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
```

to this:

```
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, 0);
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
```

in my texture renderer. I'll update the bigflake examples in a bit.

SurfaceTexture updateTexImage to shared 2 EGLContexts - Problems on Android 4.4

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