The Optimize for Web Streaming option (also known as Fast Start) in iFlicks re-writes the file after processing in order to place the container header and metadata at the start of the file.
This is usually not necessary when working with Apple devices, but allows for faster start of playback on devices from other manufacturers.
Enabling this option does NOT cause any changes to the content of the file itself, just the order in which the content is available in the file. Due to this, even small changes like adding metadata can make it necessary to rewrite the whole file again to remain optimized for streaming.
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