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• How to create a fixed image video with ffmpeg that avoids pixelization when it's not maximized ?

  11 août 2022, par Nelson Teixeira

  I have a waiting video in the project I develop. This video is a fixed waiting image with music. I was asked to change the image in the video due to deprecated logo.

  


  So initially I tried just to replace the image in the video using this command :

  


  ffmpeg -i old_waiting_video.mp4 -i new_image.png -filter_complex "[1][0]scale2ref[i][v];[v][i]overlay" -c:a copy new_waiting_video.mp4


  


  This lead to the image became pixelated when the video isn't maximized. When maximized the image is OK. But it looks terrible in the small player.

  


  Here is an image of the problem :

  


  

  


  The above image is the image without zoom out. The left bottom image is a screen capture when I resize it in an image tool and the right bottom is a screen capture of how it looks like in the player.
The image has more than this text, but I thought that wouldn't be appropriate to display my company's logo here. The logo itself is even more pixelized and looks terrible.

  


  So to try to solve this problem I extracted the audio from the file and try to add the image and the audio together to see if it removed the pixelization. So I used this command :

  


  ffmpeg -i audio.m4a -i new_image.png new_waiting_video.mp4


  


  When it failed, searching a bit I came across this other command :

  


  ffmpeg -loop 1 -i new_image.png -i audio.m4a -c:v libx264 -tune stillimage -c:a copy -pix_fmt yuv420p -shortest new_waiting_video.mp4


  


  Again the pixelization ocurred. I know it's possible because this problem doesn't occur in the old logo.

  


  What would be the correct command that allowed that the zoomed out image in the player doesn't pixelate ?

  


  Edit 1

  


  I would also be interested in a command that substitutes the image on the old video as long it doesn't pixelate in the non-maximized player.

  


  Edit 2

  


  

  • Video resolution : 1920x1080

  


  • New image resolution : 1920x1080

  


  • Non-maximized video player size : 640x360

  


  • Video tag : <video src="my-video-url.mp4" style="width: 640px;"></video>

  


  


• is it possible to overlay an image on each frame of a video using FFMPEG

  11 mai 2017, par ReubenCH

  I am trying to overlay 10 different images on a 10 second video. I am currently able to overlay one image over the entire time span of the video using FFMPEG. I want to be able to see a different image every sec on the video.

  How can i achieve this if it is possible ?

  Regards,
  Reuben

• ffmpeg : 1 image + 1 audio = 1 video (how can it encode faster ?)

  11 août 2013, par user1062949

  I want ffmpeg to take a png image and a mp3 audio file as input and generate a video file of the same duration as the audio file. I'm using the following command :

   ffmpeg -loop 1 -shortest -y -i image.png -i audio.mp3 -acodec copy \
  
   -vcodec libx264 video.mov

  However, given a 40min mp3 file (160kbps) as input, it is taking more than 2 hours to encode the whole video on a MacBook Pro i5 2.5GHz.

  I tried to use the -preset ultrafast option, but it is not really improving the encoding speed significantly.

  Is there any way to encode it faster using ffmpeg ?

  I was following the instructions provided in this post : ffmpeg : 1 image + 1 audio file = 1 video

  Any help will be appreciated, thank you.