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

[Lou]

On Sun, May 15, 2016, at 07:07 AM, Virgil Stokes wrote:
> 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.

Please show info about your input file and your ffmpeg version. Show the
complete output of:

ffmpeg -i input.mp4