Unable to use Media3Effect in Preview or Video_Capture when using multiple camera configs

[Sebastine “Hendrick” Odeh]

The Camera crashes with the error below whenever I try to apply a Media3Effect in PREVIEW or VIDEO_CAPTURE mode. Applying the effect to either mode works, but using it together kills the Camera.


And here's my code to bind the camera

suspend fun bindToCamera(applicationContext: Context, lifecycleOwner: LifecycleOwner) {
currentCameraProvider?.unbindAll()
currentCameraProvider = ProcessCameraProvider.awaitInstance(applicationContext)

var primaryCameraSelector: CameraSelector? = null
var secondaryCameraSelector: CameraSelector? = null

for (cameraInfos in currentCameraProvider!!.availableConcurrentCameraInfos) {
primaryCameraSelector =
cameraInfos.firstOrNull { it.lensFacing == CameraSelector.LENS_FACING_BACK }?.cameraSelector
secondaryCameraSelector =
cameraInfos.firstOrNull { it.lensFacing == CameraSelector.LENS_FACING_FRONT }?.cameraSelector
if (primaryCameraSelector != null && secondaryCameraSelector != null) {
break // Found both, stop searching
} else {
primaryCameraSelector = null
secondaryCameraSelector = null
}
}

if (primaryCameraSelector == null || secondaryCameraSelector == null) return

val effect = Media3Effect(
applicationContext,
PREVIEW or VIDEO_CAPTURE,
applicationContext.mainExecutor
) {
Log.e("DualCameraSingleVideoUseCase", "Applying media3effect failed with", it)
}

val resolutionSelector = ResolutionSelector.Builder().setAspectRatioStrategy(
AspectRatioStrategy.RATIO_16_9_FALLBACK_AUTO_STRATEGY
).build()
val preview = Preview.Builder().setResolutionSelector(resolutionSelector).build()


preview.setSurfaceProvider { newSurfaceRequest ->
_mSurfaceRequest.update { newSurfaceRequest }
}

val recorder = Recorder.Builder().setQualitySelector(
QualitySelector.from(Quality.HD)
).build()
videoCapture = VideoCapture.withOutput(recorder)

effect.setEffects(listOf(Contrast(0.5f)))

val useCaseGroup = UseCaseGroup.Builder()
.addUseCase(preview)
.addUseCase(videoCapture!!)
.addEffect(effect)
.build()

val primary = SingleCameraConfig(
primaryCameraSelector,
useCaseGroup,
CompositionSettings.Builder()
.setAlpha(1.0f)
.setOffset(0.0f, 0.0f)
.setScale(1.0f, 1.0f)
.build(),
lifecycleOwner
)
val secondary = SingleCameraConfig(
secondaryCameraSelector,
useCaseGroup,
CompositionSettings.Builder()
.setAlpha(1.0f)
.setOffset(0.65f, -0.7f)
.setScale(0.25f, 0.25f)
.build(),
lifecycleOwner
)

currentCameraProvider?.bindToLifecycle(listOf(primary, secondary))

try {
awaitCancellation()
} finally {
currentCameraProvider!!.unbindAll()
}
}

[Sebastine “Hendrick” Odeh]

Creating two Media3Effect instances, one for preview and the other for video_capture, works as a hack for this issue. Unfortunately, I'm unable to combine them at the moment. I'm using version 1.5.0-beta01 of camera-compose, and its libraries

[Scott Nien]

This is indeed an issue. 

I've filed a bug 

https://issuetracker.google.com/425565129 to track it. 

We will try to fix it in Q3. 

Scott

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