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

[Edward Park]

Hi,

> 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.


The concat filter should have [# of segments] × ([# of audio streams] + [# of video streams]), or n × (v + a) as specified to the filter. You seem to have 2 segments (n=2) with 2 streams (v=1:a=1) each. 

Regards,
Ted Park