[FFmpeg-user] concat audio files
Paul B Mahol
onemda at gmail.com
Sat Jun 11 13:53:09 EEST 2022
On Sat, Jun 11, 2022 at 12:02 PM Michael Koch <astroelectronic at t-online.de>
> 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 concat=n=2:a=1
> >> 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  could be
> omitted because there are only these two inputs. [0:0][1:0] does also work.
You should really use lavfi-preview, its GUI for libavfilter.
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