FileMp4OutputSettings.enableIncrementalMp4Write property

Enable "incremental" write mode of non-fragmented mp4 output file. This periodically updates the file header (the moov) to reflect the latest data that has been written, so that the file can be loaded/reloaded in some player while it is being written. You must set to ensure an appropriate space can be reserved for the header or the file will no longer update incrementally

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