Voici l'aide-mémoire pour la transition de la superposition dans les 4 directions...
************************* Text **********************
1) left to right given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -vf "[in]drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Hi': y=53.48 :x=min(t*250-2*250\,41): fontsize=35: fontcolor=yellow: enable='between(t,2,10)', drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Ajeet': y=53.48 :x=min(t*250-3*250\,90): fontsize=35: fontcolor=yellow: enable='between(t,3,10)' [out]" -t 11 leftToRight.mp4
2) right to left given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -vf "[in]drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Hi': y=53.48 :x=w-min(t*250-2*250\,(w\-41)): fontsize=35: fontcolor=yellow: enable='between(t,2,10)', drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Ajeet': y=53.48 :x=w-min(t*250-3*250\,(w\-90)): fontsize=35: fontcolor=yellow: enable='between(t,3,10)' [out]" -t 11 rightToLeft.mp4
3) top to bottom given y=58 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -vf "[in]drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Hi': x=41 :y=min(t*250-2*250\,53.48): fontsize=35: fontcolor=yellow: enable='between(t,2,10)', drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Ajeet': x=90 :y=min(t*250-3*250\,53.48): fontsize=35: fontcolor=yellow: enable='between(t,3,10)' [out]" -t 11 topToBottom.mp4
4) bottom to up given y=90 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -vf "[in]drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Hi': x=41 :y=h-min(t*250-2*250\,(h\-53.48)): fontsize=35: fontcolor=yellow: enable='between(t,2,10)', drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Ajeet': x=90 :y=h-min(t*250-3*250\,(h\-53.48)): fontsize=35: fontcolor=yellow: enable='between(t,3,10)' [out]" -t 11 bottomToTop.mp4
************************ Image *********************
1) single left to right given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -loop 1 -i image.png -filter_complex "[1:v]scale=-2:100[png];[0:v][png]overlay=x=min(t*250-2*250\,41):y=60:shortest=1:enable='between(t,2,10)'" -t 11 imageLeftToRight1.mp4
ffmpeg -y -i 'https://player.vimeo.com/external/181472383.sd.mp4?s=103f42915141758d95a118f070d08190845bdf73&profile_id=164' -loop 1 -i image.png -filter_complex "[1:v]scale=-2:100[png];[0:v][png]overlay=x=min(t*250-2*250\,41):y=60:shortest=1:enable='between(t,2,10)'" -t 11 imageLeftToRight.mp4
2) Already added text then added single image left to right
ffmpeg -y -i leftToRight.mp4 -loop 1 -i image.png -filter_complex "[1:v]scale=-2:100[png];[0:v][png]overlay=x=min(t*250-2*250\,41):y=200:shortest=1:enable='between(t,2,10)'" -t 11 imageTextLeftToRight.mp4
3) 2 images left to right given x=41, x=100 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -loop 1 -i image.png -loop 1 -i image2.png -filter_complex "[1]scale=-2:100[img1];[2]scale=-2:100[img2];[0][img1]overlay=x=min(t*250-2*250\,41):y=60:enable='between(t,2,10)':shortest=1[o1];[o1][img2]overlay=x=min(t*250-3*250\,100):y=200:enable='between(t,3,10)':shortest=1" -t 11 multiImageLeftToRight.mp4
4) 3 images left to right given x=41, x=100, x=300 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -loop 1 -i image.png -loop 1 -i image2.png -loop 1 -i image3.png -filter_complex "[1]scale=-2:100[img1];[2]scale=-2:100[img2];[3]scale=-2:100[img3];[0][img1]overlay=x=min(t*250-2*250\,41):y=60:enable='between(t,2,10)':shortest=1[o1];[o1][img2]overlay=x=min(t*250-3*250\,130):y=130:enable='between(t,3,10)':shortest=1[o2];[o2][img3]overlay=x=min(t*250-4*250\,260):y=190:enable='between(t,4,10)':shortest=1" -t 11 threeImageLeftToRight.mp4
5) 3 images right to left given x=41, x=100, x=300 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -loop 1 -i image.png -loop 1 -i image2.png -loop 1 -i image3.png -filter_complex "[1]scale=-2:100[img1];[2]scale=-2:100[img2];[3]scale=-2:100[img3];[0][img1]overlay=x=W-min(t*250-2*250\,(W\-41)):y=60:enable='between(t,2,10)':shortest=1[o1];[o1][img2]overlay=x=W-min(t*250-3*250\,(W\-130)):y=130:enable='between(t,3,10)':shortest=1[o2];[o2][img3]overlay=x=W-min(t*250-4*250\,(W\-260)):y=190:enable='between(t,4,10)':shortest=1" -t 11 threeImageRightToLeft.mp4
6) 3 images top to bottom given y=41, y=100, y=300 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -loop 1 -i image.png -loop 1 -i image2.png -loop 1 -i image3.png -filter_complex "[1]scale=-2:100[img1];[2]scale=-2:100[img2];[3]scale=-2:100[img3];[0][img1]overlay=x=41:y=min(t*250-2*250\,60):enable='between(t,2,10)':shortest=1[o1];[o1][img2]overlay=x=130:y=min(t*250-3*250\,130):enable='between(t,3,10)':shortest=1[o2];[o2][img3]overlay=x=260:y=min(t*250-4*250\,190):enable='between(t,4,10)':shortest=1" -t 11 threeImageTopToBottom.mp4
7) 3 images bottom to top given y=41, y=100, y=300 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -loop 1 -i image.png -loop 1 -i image2.png -loop 1 -i image3.png -filter_complex "[1]scale=-2:100[img1];[2]scale=-2:100[img2];[3]scale=-2:100[img3];[0][img1]overlay=x=41:y=H-min(t*250-2*250\,(H\-60)):enable='between(t,2,10)':shortest=1[o1];[o1][img2]overlay=x=130:y=H-min(t*250-3*250\,(H\-130)):enable='between(t,3,10)':shortest=1[o2];[o2][img3]overlay=x=260:y=H-min(t*250-4*250\,(H\-190)):enable='between(t,4,10)':shortest=1" -t 11 threeImageBottomToTop.mp4
************************ GIF *********************
1) single left to right given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -ignore_loop 0 -i gif1.gif -filter_complex "[1:v]scale=-2:100[ovrl];[0:v][ovrl]overlay=x=min(t*250-2*250\,41):y=60:enable='between(t,2,10)'" -t 11 gifLeftToRight.mp4
2) double left to right given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -ignore_loop 0 -i gif1.gif -ignore_loop 0 -i gif2.gif -ignore_loop 0 -i gif3.gif -filter_complex "[1]scale=-2:100[gif1];[2]scale=-2:100[gif2];[0][gif1]overlay=x=min(t*250-2*250\,41):y=60:enable='between(t,2,10)':shortest=1[o1];[o1][gif2]overlay=x=min(t*250-3*250\,150):y=170:enable='between(t,3,10)':shortest=1" -t 11 doubleGifLeftToRight.mp4
3) three left to right given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -ignore_loop 0 -i gif1.gif -ignore_loop 0 -i gif2.gif -ignore_loop 0 -i gif3.gif -filter_complex "[1]scale=-2:100[gif1];[2]scale=-2:100[gif2];[3]scale=-2:100[gif3];[0][gif1]overlay=x=min(t*250-2*250\,41):y=60:enable='between(t,2,10)':shortest=1[o1];[o1][gif2]overlay=x=min(t*250-3*250\,150):y=170:enable='between(t,3,10)':shortest=1[o2];[o2][gif3]overlay=x=min(t*250-4*250\,240):y=240:enable='between(t,4,10)':shortest=1" -t 11 threeGifLeftToRight.mp4
3) three right to left given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -ignore_loop 0 -i gif1.gif -ignore_loop 0 -i gif2.gif -ignore_loop 0 -i gif3.gif -filter_complex "[1]scale=-2:100[gif1];[2]scale=-2:100[gif2];[3]scale=-2:100[gif3];[0][gif1]overlay=x=W-min(t*250-2*250\,(W\-41)):y=60:enable='between(t,2,10)':shortest=1[o1];[o1][gif2]overlay=x=W-min(t*250-3*250\,(W\-150)):y=170:enable='between(t,3,10)':shortest=1[o2];[o2][gif3]overlay=x=W-min(t*250-4*250\,(W\-240)):y=240:enable='between(t,4,10)':shortest=1" -t 11 threeGifRightToLeft.mp4
3) three top to bottom given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -ignore_loop 0 -i gif1.gif -ignore_loop 0 -i gif2.gif -ignore_loop 0 -i gif3.gif -filter_complex "[1]scale=-2:100[gif1];[2]scale=-2:100[gif2];[3]scale=-2:100[gif3];[0][gif1]overlay=x=41:y=min(t*250-2*250\,60):enable='between(t,2,10)':shortest=1[o1];[o1][gif2]overlay=x=150:y=min(t*250-3*250\,170):enable='between(t,3,10)':shortest=1[o2];[o2][gif3]overlay=x=240:y=min(t*250-4*250\,240):enable='between(t,4,10)':shortest=1" -t 11 threeGifTopToBottom.mp4
3) three bottom to top given x=41 position
ffmpeg -y -i 'https://player.vimeo.com/external/181545195.sd.mp4?s=176d502710df829442a83565bb79efbe3c9c0b93&profile_id=164' -ignore_loop 0 -i gif1.gif -ignore_loop 0 -i gif2.gif -ignore_loop 0 -i gif3.gif -filter_complex "[1]scale=-2:100[gif1];[2]scale=-2:100[gif2];[3]scale=-2:100[gif3];[0][gif1]overlay=x=41:y=H-min(t*250-2*250\,(H\-60)):enable='between(t,2,10)':shortest=1[o1];[o1][gif2]overlay=x=150:y=H-min(t*250-3*250\,(H\-170)):enable='between(t,3,10)':shortest=1[o2];[o2][gif3]overlay=x=240:y=H-min(t*250-4*250\,(H\-240)):enable='between(t,4,10)':shortest=1" -t 11 threeGifBottomToTop.mp4