As a straightforward example, I've taken Apple's MV-HEVC sample project and added two lines.
First, after the AVAssetWriterInput is created:
frameInput.performsMultiPassEncodingIfSupported = true
Second, after the call to multiviewWriter.startWriting():
print("canPerformMultiplePasses: \(frameInput.canPerformMultiplePasses)")
Which prints true.
This leads me to believe that the first encoding pass should proceed as-normal (even though I haven't handled the logic for the completion of the first pass, etc.).
However, I receive this error when the code attempts to appendTaggedBuffers to the AVAssetWriterInputTaggedPixelBufferGroupAdaptor:
Fatal error: Failed to append tagged buffers to multiview output
Am I missing a step? Or is the multi-pass encoding only supported for standard sample/pixel buffers (and not tagged buffers)?
