[FFmpeg-user] concat demuxer filter_complex (fade)

[Paul B Mahol]

On 4/14/20, atticus via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
> ‐‐‐‐‐‐‐ 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?

There is transition fadeblack: http://trac.ffmpeg.org/wiki/Xfade

>
> With kind regards
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