[FFmpeg-user] Use concat filter with a fade

[Michael Koch]

Am 14.06.2022 um 13:47 schrieb Cecil Westerhof via ffmpeg-user:
> Sometimes I have to cut parts out of a video. I now use for this (bash on Debian):
>      ffmpeg -y                                                \
>             -ss ${videoStart} -to ${cutStart} -i ${inputFile} \
>             -ss ${cutEnd}     -to ${videoEnd} -i ${inputFile} \
>             -vcodec         libx264                           \
>             -crf            26                                \
>             -acodec         libmp3lame -qscale:a 9            \
>             -preset         veryfast                          \
>             -lavfi "concat=n=2:v=1:a=1"                       \
>             -an ${outputFile}
>
> But the cut from one part to another is a bit abrupt. Is there a
> possibility to smooth it with something like a fade?

you can use the xfade filter. :
https://www.ffmpeg.org/ffmpeg-all.html#xfade
https://trac.ffmpeg.org/wiki/Xfade

Michael