[FFmpeg-user] Multiple xfade in one run

[Cecil Westerhof]

Paul B Mahol <onemda at gmail.com> writes:

> 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.

I am concerning ffmpeg still a newbie. What do you mean by this?

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