[FFmpeg-user] Multiple xfade in one run

[Paul B Mahol]

On Mon, Jul 4, 2022 at 6:15 PM Cecil Westerhof via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

> Some time ago I was experimenting with xfade. I wanted to know how to
> use several in one run. Now I really needed it, so I did some digging
> and found this:
>      ffmpeg -y                  \
>       -i input0.mkv             \
>       -i input1.mkv             \
>       -i input2.mkv             \
>       -i input3.mkv             \
>       -i input4.mkv             \
>       -i input5.mkv             \
>       -i input6.mkv             \
>       -i input7.mkv             \
>       -i input8.mkv             \
>       -i input9.mkv             \
>       -vcodec libx264           \
>       -crf    26                \
>       -preset veryfast          \
>       -filter_complex "
>         [0:a][1:a] acrossfade=d=4[a1];
>         [0:v][1:v] xfade=transition=hlslice:
>                           duration=4:
>                           offset=308[v1];
>
>         [a1][2:a] acrossfade=d=4[a2];
>         [v1][2:v] xfade=transition=vertopen:
>                           duration=4:
>                           offset=357[v2];
>
>         [a2][3:a] acrossfade=d=4[a3];
>         [v2][3:v] xfade=transition=circlecrop:
>                           duration=4:
>                           offset=533[v3];
>
>         [a3][4:a] acrossfade=d=4[a4];
>         [v3][4:v] xfade=transition=rectcrop:
>                           duration=4:
>                           offset=1016[v4];
>
>         [a4][5:a] acrossfade=d=4[a5];
>         [v4][5:v] xfade=transition=slideup:
>                           duration=4:
>                           offset=1158[v5];
>
>         [a5][6:a] acrossfade=d=4[a6];
>         [v5][6:v] xfade=transition=wiperight:
>                           duration=4:
>                           offset=1473[v6];
>
>         [a6][7:a] acrossfade=d=4[a7];
>         [v6][7:v] xfade=transition=horzclose:
>                           duration=4:
>                           offset=1661[v7];
>
>         [a7][8:a] acrossfade=d=4[a8];
>         [v7][8:v] xfade=transition=diagbl:
>                           duration=4:
>                           offset=2082[v8];
>
>         [a8][9:a] acrossfade=d=4[a9];
>         [v8][9:v] xfade=transition=slideright:
>                           duration=4:
>                           offset=2211[v9]
>       "                         \
>       -map '[v9]' -map '[a9]'   \
>       output.mkv
>
> I hope there are better ways, because there are some problems with it.
> For example it needs a lot of memory. (24 GB)
>

Could use (a)movie filters and only use such filter when actually needed in
graph.

>
> --
> Cecil Westerhof
> Senior Software Engineer
> LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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