[FFmpeg-user] Prepend a single frame to a MP4 file

Virgil Stokes vs at it.uu.se
Sun May 15 17:07:20 CEST 2016

How can one prepend a single frame to an existing MP4 file downloaded from 
YouTube? The purpose of this new "first frame" is to add some identification 
information (text) to the MP4.

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