[FFmpeg-user] concat audio files

Michael Koch astroelectronic at t-online.de
Sat Jun 11 13:01:45 EEST 2022

Am 11.06.2022 um 11:46 schrieb 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?

yes, it works after I added v=0. Isn't this the normal syntax to specify 
the two inputs of the concat filter? In this case [0][1] could be 
omitted because there are only these two inputs. [0:0][1:0] does also work.


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