[FFmpeg-user] concat audio files

[Nicolas George]

Michael Koch (12022-06-11):
> I always get this error message:
> Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1 matches
> no streams.

Where did you find this "[number]" syntax, and has it ever worked for
you?

Regards,

-- 
  Nicolas George
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