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I have bee experimenting with ffmpeg on video transitions , Now am stuck in this transition , I have no where to go ,
I have two videos like this,
at the end of first video i have to split the first video into two from center and reveal the second video like the following,
any help would be appreciated
Some variant of:
ffmpeg -i FIRST -i SECOND -lavfi "blend=all_expr='if(lte((W/2-sqrt((X-W/2)*(X-W/2)))+N*SW,W/2),A,B)'" OUTPUT
This needs a slightly elaborate filtergraph to do as described.
-filter_complex
"[0]split[b1][b2];
[b1]crop=iw/2:ih:0:0[b1];
[b2]crop=iw/2:ih:iw/2:0[b2];
[1][b1]overlay=x='0-(W/2)*(t-DUR0)/D':enable=gte(t,DUR0)[ob1];
[ob1][b2]overlay=x='W/2+(W/2)*(t-DUR0)/D':enable=gte(t,DUR0)[fv]
"
where 0 is video '1' and 1 is video '2'. DUR0 should be replaced with duration of video '1' and D with duration of the effect.
A curtain effect, like what Paul described, can be done like this:
blend=all_expr='if(lte((W/2-abs(X-SW*W/2))/(SW*W/2),(T-S)/D),B,A)'
where S is start time in seconds. (You may want/need to adjust the timestamps of the top video 'A' beforehand using setpts) and D is duration of effect. These two variables should be replaced with the required numeral values.
I can't test either of these for a few days.
