[FFmpeg-user] concat demuxer filter_complex (fade)

[mail-login+ffmpeg at protonmail.com]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, April 14, 2020 11:07 AM, Paul B Mahol <onemda at gmail.com> wrote:
> > I thought about this yesterday and came up with something like this:
> > ffmpeg -i in.JPG -filter_complex "[0:0]loop=loop=-1:start=0:size=100
> > [looped] ; [looped] trim=start=0:end=10 [trimmed] ; [trimmed]
> > fade=type=in:start_frame=0:duration=3:color=black [fadeIn]" -map [fadeIn]
> > -c:v h264 -r 60 out.mkv
> > or this
> > ffmpeg -loop 1 -i in.JPG -filter_complex "[0:0] trim=start=0:end=200
> > [trimmed] ; [trimmed] fade=type=in:start_frame=0:duration=3:color=black
> > [fadeIn]" -map [fadeIn] -c:v h264 out2.mkv
> > (I'd just have to add a concat filter to the filter chain and an audio
> > stream). I'm just not quite sure if there is a more smart way to do this
> > (which for example would be a bit faster, since this is (in my opinion a bit
> > slow for just duplicating a single frame). Well is there a smarter and/or
> > faster way?
> > And can you recommend which of these two commands above might be the better
> > one?
>
> Please use xfade filter instead.
>

What for? To not fade out to black and fade then in from black? Or are there
other benefits of the xfade filter?

With kind regards