I have integrated all video transitions of ffmpeg-video-slideshow-scripts.
You can get the transitions by buying me a coffee from 
fade_in_one equals the default fade transition.
The ffmpeg-video-slideshow-scripts transitions
- bars_horizontal_one
- bars_horizontal_two
- bars_vertical_one
- bars_vertical_two
- checkerboard
- clock
- collapse_both
- collapse_circular
- collapse_horizontal
- collapse_vertical
- cover_horizontal_l2r
- cover_horizontal_r2l
- cover_vertical_b2t
- cover_vertical_t2b
- expand_both
- expand_circular
- expand_horizontal
- expand_vertical
- fade_in_one
- fade_in_two
- moving_bars_horizontal_l2r
- moving_bars_horizontal_r2l
- moving_bars_vertical_b2t
- moving_bars_vertical_t2b
- push_horizontal_l2r
- push_horizontal_r2l
- push_vertical_b2t
- push_vertical_t2b
- rotate_one
- sliding_bars_horizontal_l2r
- sliding_bars_horizontal_r2l
- sliding_bars_vertical_b2t
- sliding_bars_vertical_t2b
- wipe_in_horizontal_l2r
- wipe_in_horizontal_r2l
- wipe_in_vertical_b2t
- wipe_in_vertical_t2b
- wipe_out_horizontal_l2r
- wipe_out_horizontal_r2l
- wipe_out_vertical_b2t
- wipe_out_vertical_t2b
are also licensed under the MIT license.
The ffmpeg-video-slideshow-scripts transitions
- box_in_horizontal_l2r
- box_in_horizontal_r2l
- box_in_vertical_b2t
- box_in_vertical_t2b
- push_box_horizontal_l2r
- push_box_horizontal_r2l
- push_box_vertical_b2t
- push_box_vertical_t2b
- rotate_two
- spin_blur_rotation
are licensed under the ARTHENICA Commercial License.