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• How to create a box shadow effect when overlaying an image on a video using FFmpeg ? [closed]

  4 avril 2024, par Kataklycm

  I'm working on a video project where I need to overlay an image on a background video. I've managed to achieve the basic overlay using the following FFmpeg command :

  


  ffmpeg -i background.mp4 -i image_video.mp4 -filter_complex "[0][1]overlay=(W-w)/2:(H-h)/2" -c:v libx264 -crf 23 -preset veryfast output.mp4

  


  This command overlays the image on the background video, centered. However, I would like to add an effect similar to a CSS box shadow, where the overlaid image has a shadow that gradually fades out, giving it a sense of depth.

  


  I've tried various combinations of FFmpeg filters, such as boxblur, gblur, and drawbox, but I can't quite achieve the desired effect.

  


  I'm attaching two images to illustrate what I have and what I'm trying to achieve :

  


  

  1. The current result of my FFmpeg command : https://i.imgur.com/3uK79jP.png

  


  2. An example of the desired box shadow effect : https://i.imgur.com/KaIq7VI.png

  


  


• FFMPEG : how to overlay a moving PNG with multiply blend effect (overlay filter + blend filter) [closed]

  22 avril 2024, par user24565885

  I tried hunting for all existing questions and couldn't find a match :-(

  


  I have a video and a PNG image that I overlay on top of that. The PNG needs to move across the video (this I have working). But I want the PNG to use a "multiply" blend effect vs. a standard alpha overlay. Whenever I try to apply both filters I get an error.

  


  This code works and moves the image (the last one) across as expected :

  


  ffmpeg -i d6b5ec90-8823-41cf-9b81-3086ce83054a.mp4   -loop 1 -i 593e677d-02bb-49c2-a0c6-c3dd8f8c2f72.png  -loop 1 -i 32fea58f-ebe1-447e-b079-06f8ebb9df52.png  -loop 1 -i cb7435fb-5aff-4eeb-af2a-22b92c900db6.png -filter_complex "[0]fps=30,scale=3840:3840[o1];[1]fps=30,setpts=PTS+0.000/TB[t_1];[o1][t_1]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,0.000,5.000)':shortest=1[o2];[2]fps=30,setpts=PTS+1.000/TB[t_2];[o2][t_2]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,1.000,5.000)':shortest=1[o3];[3]fps=30[t_3];[o3][t_3]overlay='main_w*(1.5+(0-1.5)*max(0,1-(n-1.000*30)/(4.5*30)))':0:enable='between(t,1.000,4.500)':shortest=1" -r 30 -pix_fmt yuv420p -c:a aac -b:a 128k -c:v libx264 -b:v 8000k out.mp4


  


  I now want that last effect to use multiply for blending and that's what I can't figure out. Applying both filters with a comma seems reasonable but bonks (NOTE : the MP4 and all PNGs are 3840x3840 so it's not a size issue)

  


  [o3][t_3]overlay='main_w*(1.5+(0-1.5)*max(0,1-(n-1.000*30)/(4.5*30)))':0:enable='between(t,1.000,4.500)':shortest=1,blend=all_mode='multiply':all_opacity=1


  


  The error I get is "Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_blend_10".

  


  I've looked at this one : In FFmpeg, using -filter_complex, how can I overlay and blend at the same time ? but can't quite figure out how I would split, blend, then overlay in my situation where the last input PNG ([3]) needs to blend and move...

  


  Would really appreciate the help if anyone has a solution.

  


  THANKS !

  


• Moviepy V2 How do you position a TextClip and apply an effect ?

  31 janvier, par Brandon

  I am trying to refactor my code to use the new Moviepy Version 2.0 and I'm having trouble with .with_position / SlideIn / SlideOut effect.

  


  When I apply the SlideIn effect it seems to override any position I have applied. It there a way to explicitly set the position of a TextClip and apply a SlideIn and SlideOut effect without using nested CompositeVideoClip ?

  


  In the below example the with_position((0,0)) would not be implemented and the position of the TextClip would revert to the default centred position. If I remove the lines .with_effect... then the TextClip would be positioned as expected in the 0,0 location.

  


  Any help would be much appreciated.

  


  from moviepy import *

clips = []
clip = ImageClip("path1.png", duration=3).with_start(0)
clips.append(clip)
title = TextClip("path3.ttf", text="Text...", font_size=80, color="#fff", text_align="center", duration=1,)
title = title.with_start(1).with_position((0,0))
title = title.with_effects([vfx.SlideIn(0.25, "left")])
title = title.with_effects([vfx.SlideOut(0.25, "left")])
clips.append(title)

final_clip = CompositeVideoClip(clips)
final_clip.write_videofile("final_clip.mp4")


  


  *EDIT
To get the expected behaviour I need to use multiple nested CompositeVideoClips but this significantly slows it down. Is there anyway that I can make this code more efficient ?

  


  from moviepy import *

clips = []
clip = ImageClip("path1.png", duration=3).with_start(0)
clips.append(clip)
title = TextClip("path3.ttf", text="Text...", font_size=80, color="#fff", text_align="center", duration=1,)
title = CompositeVideoClip(title.with_effects([vfx.SlideIn(0.25, "left")]))
title = CompositeVideoClip(title.with_effects([vfx.SlideOut(0.25, "left")]))
title = title.with_start(1).with_position((0,0))
clips.append(title)

final_clip = CompositeVideoClip(clips)
final_clip.write_videofile("final_clip.mp4")