[FFmpeg-user] Cannot find a matching stream for unlabeled input pad 7 on filter Parsed_concat_2

[Randy Johnson]

On October 29, 2020, Nicolas George <george at nsup.org> wrote:
> Randy Johnson via ffmpeg-user (12020-10-29):
> >
> [0:v]setsar=1[v0];[2:v]setsar=1[v1];[v0][4:a][v1][4:a]concat=n=8:v=1:a=1"
>  1 2 3 4
>
> Still 4 inputs. Now, 8×(1+1) = 16. Sixteen is still not equal to four.
>

Sorry Nicolas, but I think I am still confused.  I changed it to 16 and
get the same error so I am thinking I am not understanding.