Fragmented MP4 AVAssetWriter

Originator:cellsworth
Number:rdar://FB6748976 Date Originated:2019-07-19
Status:Open Resolved:
Product: Product Version:
Classification: Reproducible:
 
It would be highly beneficial if AVAssetWriter were able to produce a fragmented MP4 (fMP4). This currently seems to be utilized when `movieFragmentInterval` is set. However, in the current implementation, the file loses its `moof` atoms upon calling finishWritingWithCompletionHandler.

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