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• FFMPEG blending comes out looking grayscale rather than colourful

  17 novembre 2022, par OneWorld

  When i do a blend of two pngs, it comes out looking grayscale whereas it should have colour.

  


  These are the two PNG input assets that I then create MP4s from :-

  


  

  


  

  


  Here is the command :-

  


  ffmpeg -i black_circle.png -i pikachu.png -filter_complex "[0:v]setsar=sar=1,format=rgb24[rgb1];[1:v]setsar=sar=1,format=rgb24[rgb2];[rgb1]split[out1_1][out1_2];[out1_1]crop=50:50:0:0:exact=1,setsar=1[cropped1];[cropped1][rgb2]blend=screen[blended1];[out1_2][blended1]overlay=0:0" pikachu_screened_on_circle_rgb.png


  


  And here is the output :-

  


  

  


  However, Pikachu should retain his Red, Green and Blue, but instead Pikachu looks grayscale.

  


  I was wondering why this is ?

  


  And what i need to do so that Pikachu retains his yellow skin, and rosey cheeks ?

  


  So I thought initially that it might be something to do with the white and black circle being a grayscale asset. But then I replaced the black and white circle with this asset :-

  


  

  


  and I saw that when something is black FFMPEG makes it grayscale :-

  


  

  


  The command using these two assets instead is this :-

  


  ffmpeg -i rgb_backing.png -i pikachu.png -filter_complex "[0:v]setsar=sar=1,format=rgb24[rgb1];[1:v]setsar=sar=1,format=rgb24[rgb2];[rgb1]split[out1_1][out1_2];[out1_1]crop=50:50:0:0:exact=1,setsar=1[cropped1];[cropped1][rgb2]blend=screen[blended1];[out1_2][blended1]overlay=0:0" pikachu_screened_on_rgb_backing.png


  


  Is there a way to invert black to white in FFMPEG ?

  


• Center crop image overlay using FFmpeg

  27 mai 2020, par HB.

  I currently have an image that is being overlayed on top of a video, as demonstrated in this image :

  



  

  



  The blue square is representing the video and the purple lines are representing the image on top of the video.

  



  ---

  



  Currently, I have the following command :

  



  "-i", InputVideoPath, "-i", InputImagePath, "-filter_complex", "[0:v]scale=iw*sar:ih,setsar=1,pad='max(iw\\,2*trunc(ih*9/16/2))':'max(ih\\,2*trunc(ow*16/9/2))':(ow-iw)/2:(oh-ih)/2[v0];[1:v][v0]scale2ref[v1][v0];[v0][v1]overlay=x=(W-w)/2:y=(H-h)/2[v]", "-map", "[v]", "-map", "0:a", "-c:v", "libx264", "-preset", "ultrafast", "-r", "30", OutputPath


  



  This adds black padding to the sides of the video and outputs the following :

  



  

  



  But I would like the center crop the image that is being overlayed instead, giving me this output :

  



  

  



  I've seen answers that demonstrate how to crop an image or crop 2 videos, but I couldn't find a way to center crop an image that is being overlayed on top of a video.

  



  The video I'm testing with is 1920x1080 and the size of the image is not constant.

  



  Any help in achieving this will be appreciated.

  



  ---

  



  EDIT (This edit is to add more clarification).

  



  Please have a look at the image below :

  



  

  



  The image above demonstrates :

  



  

  • Purple Lines : The entire screen of the device/player, this will be used as the input image. The user draws on the screen/player.

  


  • Blue : The input video, scaled to fill the screen

  


  • Green : The actual size of the input video

  


  



  With this example, the player/image is 1920x1080 and the actual video size is 640x640. So the video is scaled 440x440 to fill the player.

  



  ---

  



  I tried to use a simple overlay, with the hopes that it will crop the video/image and output a video with the image at the same position as what was displayed on the device, by doing the following :

  



  ffmpeg -i InputVideo -i InputImage -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -c:v libx264 -preset ultrafast OutputPath


  



  But, the image is not at the same position as what it was on the device.

  



  I suspect that I will have to take into account the size difference between the scaling of the video to fit into the video player.

  



  I'm not sure how I can do this ?

  


• In Advanced SubStation Alpha (Ass file) how can I animate each word as it is spoken ?

  29 mai 2024, par Nick Powers

  Hello I am trying to get Ass (Advanced SubStation Alpha) code to animate (highlight in green) each word as it is spoken and then have it revert back to white afterwards. What happens with my code is very odd. At first I cannot even see any text. It then appears with multiple lines overlapped, partially hanging off the screen. From this point it "kind of" works. I can see the desired highlighting happening but because the text is all jumbled and overlapping it can hardly be called a success.

  


  In case it is relevant I am using ffmeg to burn in the subtitles. I am using the following command :

  


  ffmpeg -i FortuneTeller1.mp4 -vf "ass=FortuneTeller1.ass" Subtitled.mp4

  


  The resolution of the source video is 1080x1920 (vertical).

  


  My ultimate goal is to burn Hormozi style text with per word animations. I'm far from that so any input would be appreciated ! If you need any additional info/code to help troubleshoot this please let me know what you need and I will provide it.

  


  I have the following Ass code in the Events section :

  


  Dialogue: 0,0:00:02.48,0:00:03.28,Default,,0,0,0,,{\c&H00FF00&\pos(640,480)}In{\c&H00FFFFFF&} the tapestry of time, a visitor from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:03.48,0:00:04.28,Default,,0,0,0,,In {\c&H00FF00&\pos(640,480)}the{\c&H00FFFFFF&} tapestry of time, a visitor from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:04.68,0:00:09.68,Default,,0,0,0,,In the {\c&H00FF00&\pos(640,480)}tapestry{\c&H00FFFFFF&} of time, a visitor from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:09.88,0:00:01.48,Default,,0,0,0,,In the tapestry{\c&H00FF00&\pos(640,480)}of{\c&H00FFFFFF&} time, a visitor from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:02.08,0:00:04.89,Default,,0,0,0,,In the tapestry of {\c&H00FF00&\pos(640,480)}time{\c&H00FFFFFF&}, a visitor from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:06.89,0:00:10.49,Default,,0,0,0,,In the tapestry of time,{\c&H00FF00&\pos(640,480)}a{\c&H00FFFFFF&} visitor from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:10.89,0:00:03.29,Default,,0,0,0,,In the tapestry of time, a {\c&H00FF00&\pos(640,480)}visitor{\c&H00FFFFFF&} from shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:03.69,0:00:07.49,Default,,0,0,0,,In the tapestry of time, a visitor {\c&H00FF00&\pos(640,480)}from{\c&H00FFFFFF&} shadows past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:08.09,0:00:11.49,Default,,0,0,0,,In the tapestry of time, a visitor from {\c&H00FF00&\pos(640,480)}shadows{\c&H00FFFFFF&} past shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:11.89,0:00:04.89,Default,,0,0,0,,In the tapestry of time, a visitor from shadows {\c&H00FF00&\pos(640,480)}past{\c&H00FFFFFF&} shall emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:05.29,0:00:03.61,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past {\c&H00FF00&\pos(640,480)}shall{\c&H00FFFFFF&} emerge, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:03.65,0:00:04.09,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past shall {\c&H00FF00&\pos(640,480)}emerge{\c&H00FFFFFF&}, igniting flames of forgotten yearnings.
Dialogue: 0,0:00:04.13,0:00:04.57,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past shall emerge, {\c&H00FF00&\pos(640,480)}igniting{\c&H00FFFFFF&} flames of forgotten yearnings.
Dialogue: 0,0:00:04.61,0:00:04.97,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past shall emerge, igniting {\c&H00FF00&\pos(640,480)}flames{\c&H00FFFFFF&} of forgotten yearnings.
Dialogue: 0,0:00:05.03,0:00:05.09,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past shall emerge, igniting flames {\c&H00FF00&\pos(640,480)}of{\c&H00FFFFFF&} forgotten yearnings.
Dialogue: 0,0:00:05.13,0:00:05.55,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past shall emerge, igniting flames of {\c&H00FF00&\pos(640,480)}forgotten{\c&H00FFFFFF&} yearnings.
Dialogue: 0,0:00:05.59,0:00:06.31,Default,,0,0,0,,In the tapestry of time, a visitor from shadows past shall emerge, igniting flames of forgotten {\c&H00FF00&\pos(640,480)}yearnings.{\c&H00FFFFFF&}.