[FFmpeg-user] Merge files with different rotations

Mark Filipak markfilipak.windows+ffmpeg at gmail.com
Mon Mar 30 12:53:45 EEST 2020

On 03/30/2020 05:25 AM, Gabriele Greco wrote:
> Hi guys,
> Just wondering if there is a way to merge multiple files without re
> encoding using the concat format (-f concat) when one or more of the files
> are recorded with a mobile device using an upside/down orientation (rotate
> metadata to 180).
> If it's not possible, as i guess, there is a way to set the rotate metadata
> not at file level but to handle it from a certain offset in the file so
> that after the result file of the concat operation could then be used to
> encode a video with a proper rotation for the whole length

Are the "multiple files" a fixed number of files or variable?
Is the "upside/down orientation" something you want to do (or undo) or is it just what you have and 
If the files are merged, should they paneled or should they simply overlay each other?

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