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

[Nicolas George]

Randy Johnson via ffmpeg-user (12020-10-29):
> "[0:v]setsar=1[v0];[2:v]setsar=1[v1];

> [v0]

1

> [4:a]

2

> [v1]

3

> [4:a]

4

> concat=n=4:v=1:a=1"

4×(1+1) = 8 ≠4

Regards,

-- 
  Nicolas George
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