[FFmpeg-user] How to add 1or more black frames @ the beginning and @ the end of a film with audio, without transcoding?.

[MediaMouth]

Have you seen these?

https://ffmpeg.org/ffmpeg-filters.html#concat
https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg

> On Feb 18, 2021, at 2:25 AM, Marco Mircoli <nuvolablux at gmail.com> wrote:
> 
> Hello,
>   tried a lot of times, but nothing....I can't do it well.
> Any advice?
> The goal is to do it with a single command line.
> 
> Thanks.
> S.