[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 Monday, April 13, 2020 9:02 PM, Mark Filipak
> <markfilipak.windows+ffmpeg at gmail.com> wrote:
>
>> offlist
>>
>> Tips:
>> Ask questions. Don't make statements.
>> Make the questions short. If the issue is complex, ask many questions.
>>
>> On 04/13/2020 11:49 AM, atticus via ffmpeg-user wrote:
>>
>> > Since I'd like to add the feature to my script to be able to add
>> > transitions
>> > between the elements and since when using the concat demuxer for making
>> > the
>> > slideshow the different images
>> > indistinguishable for the filter chain, I have to think of another way
>> > to
>> > make a slideshow while still having the images distinguishable for the
>> > filter chain
>> > (I don't like it to preprocess the Images by making a Video of each
>> > Image
>> > because of various reasons).
>> > A fact that makes this even harder, is that I'd like to be still able to
>> > set
>> > different durations for different images (like it is possible in the
>> > input
>> > file for the concat demuxer (see https://trac.ffmpeg.org/wiki/Slideshow
>> > https://trac.ffmpeg.org/wiki/Slideshow ).
>> > Since I didn't found a solution that meets that kind of requirements,
>> > I'm
>> > asking you if someone of you might have an Idea how to do this.
>
>
>
> Hm problem with this is that it's difficult to split the complex question
> into multiple less complex questions.
>
> But 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.

>
> With kind regards
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