Camerax preview freezes after 6 photos in zero_shutter_lag mode on Samsung S21

[Frank D]

Both models of Samsung S21 5G are concerned.

To reproduce :

- use CameraXBasic demo app

- edit the cameraFragment file by changing :

imageCapture = ImageCapture.Builder()
//.setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
.setCaptureMode(ImageCapture.CAPTURE_MODE_ZERO_SHUTTER_LAG)

- launch the app

- take 6 photos normally (don't need to take them very fast)

- it freezes the preview (but you can still take new pictures)

- if you change screen orientation, the preview is unfreezed and you can take 6 pictures again before freeze.

Should I unbind/bind the camera after 5 pictures to prevent freezing or is there an other tip?

Frank

[Scott Nien]

Hi Frank 

Thanks so much for reporting the issue. I've created the bug here: https://issuetracker.google.com/380762631 to track it. 

Currently the CAPTURE_MODE_ZERO_SHUTTER_LAG is still an experimental API. This often means that the quality is still not good enough to be used in production yet. and in reality , ZSL does have some issues we haven't fixed. We will have a plan to improve it in the next quarter.  But before that,  we suggest you use other capture modes.

Scott

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[Frank Derville]

Unfortunatly this is the best mode (by far) to sync picture triggering between to Android devices to take 3d pictures

[Scott Nien]

> Unfortunatly this is the best mode (by far) to sync picture triggering between to Android devices to take 3d pictures

Hi Frank !  

This is interesting. Can you kindly tell us more information regarding why ZSL mode is the best mode for taking 3d pictures ?   

[Frank D]

Hi Scott,

In my use case I am trying to take 2 photos at the exact same time on two similar Android devices (e.g. S21). Exact same time is important when you take a 3d picture of a moving subject (or just a landscape with wind in the grass or tree leaves). So you need to reduce and control latency variance as much as possible. I have experienced several strategies and measured the time gap by taking the clock app of a third device. And the best results are with ZSL mode.

Thanks for the good work you are doing and I hope you will be able to fix this in a future version.

kr

Frank

[Scott Nien]

Hi Frank

[Scott Nien]

Hi Frank,  (Sorry for sending unfinished email)

Thanks for the information. Good news is that we have fixed the ZSL issues that you mentioned. The fix should be included in our next release. 

Scott