[FFmpeg-user] How to select audio stream in filter_complex with concat?

[Dmitri]

Aghh :)
Thank you ))

/ Dmitri

On Thu, 12 Jul 2018 at 17:26, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Thu, Jul 12, 2018 at 16:23:58 +0200, Dmitri wrote:
> > I've also tried to add same file again and map it's audio stream, but it
> > gives error:
> > "Filter concat:out:a0 has an unconnected output"
> >
> > ffmpeg -i "D:\videos\intro_1.mov" -ss 00:00:00 -to 00:00:40 -i
> > "D:\videos\logo_1.mp4" -i "D:\videos\logo_2.mp4" -i
> "D:\videos\intro_1.mov"
> > -filter_complex
> >
> "[0:v]fade=t=out:st=37:d=3[0v];[1:v]fade=t=out:st=11:d=1[1v];[2:v]fade=t=out:st=9:d=1[2v];
> > [0v][0:a][1v][1:a][2v][2:a] concat=n=3:v=1:a=1 [v1][a]" -map "[v1]" -map
> > 3:1 output.mp4 -y
> >
> > Feels like I am missing something simple :)
>
> Yes. ;-) You are still concat'ing video and audio, with audio as "[a]",
> but not mapping "[a]" anywhere. You need to adapt the concat parameters
> to use only the video streams as input, and to output only "[v1]".
>
> Moritz
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