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• ffmpeg - Understand images to video output, players show different images and lengths

  8 juillet 2023, par Matt C

  I'm using multiple images to create a video with each image on a 1-second long frame. This is the command I'm using :

  


   ffmpeg -framerate 1 -i 'image%d.jpg' -c:v libx264 -r 1 -pix_fmt yuv420p out.mp4


  


  This seems straightforward and exactly what many others have done with success. However, the output I get is an mp4 which windows file explorer says is 4 seconds long, and is different in VLC and Windows media player and neither is the desired output.

  


  In Windows : the video plays for 4 seconds with a black screen and at this point the time line at the bottom is filled up at 4 seconds, indicating the video is over. But it keeps playing, for another 4 seconds. And the last 4 seconds (from 0:04 to 0:07) is actually the desired output.

  


  





  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  Frame	Image
  1	black screen
  2	black screen
  3	black screen
  4	black screen
  5	image1.jpg
  6	image2.jpg
  7	image3.jpg
  8	image4.jpg

  


  


  In VLC : the video shows last image supplied as input for 3 seconds, followed by the second to last image for 1 second.

  


  





  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  Frame	Image
  1	image4.jpg
  2	image4.jpg
  3	image4.jpg
  4	image3.jpg

  


  


  Questions :

  


  

  1. How/Why are these different in different players ?

  


  2. Why, in VLC, are only two images showing up, and why would one of them last for 3 seconds ?

  


  3. In Windows, why/how is the video 8 seconds long but shows up as 4 seconds both in the file explorer and in the actual media player ?

  


  4. How do I get the desired output, and what caused my case to not work as it did for seemingly most others ?

  


  


• How to make overlay not hidden under pad area

  26 juin 2023, par Yousuf Essa

  i have the following command where i want overlay two images above image

  


   String command = '-y -i $backgroundImage1 -i $overlayImage1 -i $overlayImage2  -filter_complex '
                  '"[1]scale=600:600[i1];'
                  '[2]scale=600:600[i2];'
                  '[0][i1]overlay=1200:1200[01];'
                  '[01][i2]overlay=800:800'
                  ',pad=width=iw:height=ih+1000:x=0:y=0:color=black'
                  '" $outPutPath';


  


  Now i notice if i position one of the overlay to be within the black pad area that i made so it be hidden behind it , how to solve, so the overlay on top pad ?

  


  if anyone could help so kindly edit my full command because i just start to learn ffmpeg , thanks

  


• Add video and audio into image, with blend=screen

  14 juillet 2019, par Jejel Boy

  i have an image sized 1800x1200, i want to crop it to 1800x1200. Manage to do that with"

  ffmpeg -i image.jpg -vf "crop=1200:1200:0:0" -y output.jpg

  I would also like to add a video.mp4 with black background as an overlay to the output, but blend=screen so black will be transparent.

  How do i continue with the script ?