Post processing in ffmpeg to move ‘moov atom’ in MP4 files (qt-faststart)

Seems like faststart support has been included in ffmpeg. FFmpeg Formats Documentation:

-movflags faststart

Run a second pass moving the moov atom on top of the file. This
operation can take a while, and will not work in various situations
such as fragmented output, thus it is not enabled by default.

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