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• How can I resize an overlay image with ffmpeg ?

  28 novembre 2020, par Andrei Dascalu

  I am trying to add an overlay to a video using the following command

  


  ffmpeg -y -i "$videoPath" -i "$overlayPath" -filter_complex "[0:v] [1:v] overlay=$overlayPosition" -pix_fmt yuv420p -c:a copy "$outputPath" 


  


  However, I would like to be able to resize the overlay I am about to apply to some arbitrary resolution (no care for keeping proportions). However, although I followed a couple of similar solutions from SO (like FFMPEG - How to resize an image overlay ?), I am not quite sute about the meaning of the parameters or what I need to add it in my case.

  


  I would need to add something like (?)

  


  [1:v]scale=360:360[z] [1:v]overlay=$overlayPosition[z]


  


  This doesn't seem to work so I'm not sure what I should be aiming for.

  


  I would appreciate any assistance, perhaps with some explanation.

  


  Thanks !

  


• Add PNG image overlay to video starting with non-key frame

  8 mai 2020, par RamRick

  Alright, so I'm trying to edit a bunch of short to very long videos.
The goal is to mute a 1 minute part within each video and overlay that small part with a PNG image for the full duration.

  



  Because this all has to be done as fast as possible, I figured it would be the best idea to split every video into 3 parts, then mute and add the overlay to part #2 and put all 3 parts back together.

  



  The first problem I ran into was that part #2 and #3 always started with a 1-2 second freeze in video, while the audio was fine.

  



  I found out that this was caused by me cutting at key frames and ignoring non-key frames at the beginning.

  



  I fixed that by adding the -copyinkf parameter to also copy all non-key frames, like so :

  



  ffmpeg -i "in.mp4" \
-to 0:04:00 -c:v copy -c:a copy -copyinkf "p1.mp4" \
-ss 0:04:00 -to 0:05:00 -c:v copy -c:a copy -copyinkf "p2.mp4" \
-ss 0:05:00 -c:v copy -c:a copy -copyinkf "p3.mp4"


  



  So I went on and proceeded to mute part #2, like so :

  



  ffmpeg -i "p2.mp4" -af "volume=0" -c:v copy -copyinkf "p2_muted.mp4"


  



  All fine until this point, and IF I put the parts back together right now it would also be quick and accurate, like so :

  



  --parts.txt
file 'p1.mp4'
file 'p2_muted.mp4'
file 'p3.mp4'

ffmpeg -f concat -safe 0 -i parts.txt -c copy "out.mp4"


  



  But now comes the problem :

  



  Since I have to re-encode part #2 to overlay the PNG image, I get the 1-2 seconds freeze frame problem at the beginning again and I can't for the life of me figure out the "equivalent" of -copyinkf for re-encoding a video.

  



  Right now I'm overlaying the PNG image like so :

  



  ffmpeg -i "p2_muted.mp4" -i "../banner.png" -filter_complex "[1][0]scale2ref[i][v];[v][i]overlay" -c:a copy "p2_edited.mp4"


  



  So my question is, what would the equivalent to -copyinkf be, or in case there is a better way than mine, what would that be to achieve my task.

  


• How to achieve text scrolling effect using FFmpeg ? [closed]

  6 avril 2023, par smart karaler

  I want to use FFmpeg to achieve a marquee effect with text. After using the drawtext filter and expression to make the text scroll, I want the text display to be seamless at the beginning and end. Is there any way to achieve this ?

  


  I have tried using the scroll filter to achieve this effect, but it causes the entire background to scroll. I also tried splitting the screen using the split filter, but found that it was difficult to make only the text scroll while keeping the background still.

  


  Can you advise me on how to achieve this ?

  


  I want to use FFmpeg to achieve a marquee effect with text. After using the drawtext filter and expression to make the text scroll, I want the text display to be seamless at the beginning and end. Is there any way to achieve this ?

  


  I have tried using the scroll filter to achieve this effect, but it causes the entire background to scroll. I also tried splitting the screen using the split filter, but found that it was difficult to make only the text scroll while keeping the background still.