Unabe to use writeHEIFRepresentation - failed to add image to the PhotoCompressionSession.

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Created 15h

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I'm getting an error writing a ciImage as a heif image:

		// Create CIImage directly from pixel buffer
		let ciImage = CIImage(cvPixelBuffer: pixelBuffer, options: [CIImageOption.properties: combinedMetadata])
		
		// Write HEIC synchronously
		do {
			try ciContext.writeHEIFRepresentation(of: ciImage, to: url, format: .RGBA8, colorSpace: colorSpace)

The error I'm getting is:

Error Domain=CINonLocalizedDescriptionKey Code=3 "(null)" UserInfo={CINonLocalizedDescriptionKey=failed to write HEIC data to file., NSUnderlyingError=0x11b1a1ec0 {Error Domain=CINonLocalizedDescriptionKey Code=10 "(null)" UserInfo={CINonLocalizedDescriptionKey=failed to add image to the PhotoCompressionSession.}}}

Both

					try ciContext.writeJPEGRepresentation(of: copiedCIImage, to: url, colorSpace: colorSpace, options: options)

and

					try ciContext.writePNGRepresentation(of: copiedCIImage, to: url, format: .RGBA8, colorSpace: colorSpace)

work. I also verified that the code works with iOS 18.

Is there something new we need to do for Heif images?

Thanks in advance

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Answer 1

DTS Engineer OP

Apple

7h

When you get this error, do you see anything relevant in the system log? Specifically, look for log messages with a subsystem of com.apple.coreimage and a category of api.

See Your Friend the System Log for lots of hints and tips for wrangling the system log. In this case, however, the process is pretty simple:

Launch Console.
Make sure Action > Include {Info,Debug} Messages are checked.
Select your iOS device on the left.
Paste subsystem:com.apple.coreimage into the search box.
And, after that, past category:api.
Click “Start streaming”.
And then reproduce the issue.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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Answer 2

jm_tressler OP

6h

@DTS Engineer

Thanks for the info on the logging. Here is the error:

-[CIContext(ImageRepresentation) _CMPhotoRepresentationOfImage:depth:allowAlpha:containerFormat:colorSpace:options:error:] failed to add image to the PhotoCompressionSession. (kCMPhotoError_InvalidData)

I also caught the error and printed it out in Xcode:

Error Domain=CINonLocalizedDescriptionKey Code=3 "(null)" UserInfo={CINonLocalizedDescriptionKey=failed to write HEIC data to file., NSUnderlyingError=0x15b1295f0 {Error Domain=CINonLocalizedDescriptionKey Code=10 "(null)" UserInfo={CINonLocalizedDescriptionKey=failed to add image to the PhotoCompressionSession.}}}

This code works on iOS 18. Also, as stated above, I'm able to write the JPG and PNG versions of this image.

I was able to get a heif image created by using a CGImage and doing:

CGImageDestinationCreateWithURL CGImageDestinationAddImage CGImageDestinationFinalize

Hope this helps.

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