Choppy preview and video with image analysis

[Anton Ivanov]

Hey,
We've got a problem with Samsung Galaxy A6+(SM-A605FN).
When ImageAnalysis is added tot the use cases the preview is choppy and the video recorded with VideoCapture use case is choppy as well.

If the image analysis use case is removed preview is fine and video as well.

Are there any suggestions on how to fix this or should I file a bug report?

[Charcoal Chen]

Hi,

Thanks for reporting the issue.

We do not have the A6+ device. Could you help to do some testing on it for us to get some idea what the issue might be?

1. Does the issue happen on the A6+ device only and can work well on the other devices?
2. Does the issue happen if directly closing the image proxies received via ImageAnalysis' analyzer?
3. Does the issue happen if binding Preview + ImageAnalysis only?
4. Could you try to use ResolutionSelector to make the ImageAnalysis select the other different sizes to see whether the issue will be disappeared?

Thanks.

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[Anton Ivanov]

Hey,

1. We have this confirmed only on the device mentioned in the topic but there's strong evidence that it might be present on other devices as well
2. That's how it currently works
3. The preview is still choppy
4. It doesn't seem to help

Thanks.

[Charcoal Chen]

Hi,

Thanks for providing the answers. 

This should be a device-specific issue. Usually, we'll try to find some workaround to see whether the issue can be avoided with some specific settings. But, according to the answers, the issue can happen even if binding Preview + ImageAnalysis only and can't be avoided by selecting different resolution for the ImageAnalysis UseCase, there might be no good way to workaround this issue from CameraX side. The possible approach for this issue is to make your app bind Preview only and get the image frames from the Preview to do analysis. (You might need to set OnFrameAvailableListener to the SurfaceTexture to get the images.) 

[Anton Ivanov]

Hey,

Thanks for your advice.
I shall create a ticket for this issue then. Unfortunately the device is quite old but we could assist you in obtaining it if needed.

[Anton Ivanov]

Also, could you elaborate a bit more on how exactly you propose to receive frames from Preview

Thanks.

[Anton Ivanov]

Update,
I was able to receive frames intended for rendering in preview via custom OpenGl renderer and copy them to Bitmap.
Please correct me if there's simplier way to do this.

Thanks.

[Anton Ivanov]

Created a bug report
https://issuetracker.google.com/issues/411033507

[Charcoal Chen]

"receive frames intended for rendering in preview via custom OpenGl renderer and copy them to Bitmap."

Yes, this is exactly the approach to workaround the issue.

If there is any other questions, we can discuss it on https://issuetracker.google.com/issues/411033507.

Thanks.

[Anton Ivanov]

Thanks you,
asked a question in the issue thread.