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• Animated GIF overlay is not looping on Video built from Image FFmpeg

  15 octobre 2022, par nicover

  My goal is to transform an image .jpg into a .mp4 video and then add a .gif overlay on the video created.
The problem is the GIF overlay on the video created is not playing/looping.

  


  Here is the command for the image -> video :

  


  "-framerate 1/10 -i image.jpg -vf scale=720:1280 -t 10 -pix_fmt yuv420p -c:v libx264 -movflags faststart output.mp4"


  


  This create successfully a video of 10seconds from my image.

  


  Here is the command for applying the gif as overlay :

  


  -i video.mp4 -ignore_loop 0 -i animated.gif -filter_complex '[1:v]scale=321.0:-1[ovrl0];[0:v][ovrl0]overlay=160.5:487.28:shortest=1' -codec:a copy -codec:v libx264 -preset ultrafast output.mp4


  


  The overlay is correctly applied but it's not playing or looping at all.

  


  I don't know what I am doing wrong because the last command (overlay) is working perfectly when it's triggered from a classic video file (like from recorded camera or something) -> the gif is looping as expected.

  


  So I'm assuming the real issue come from the video I created from my image but result I've got seems to be good so can't find what's wrong with the image or video created.

  


  Can someone could help me please to fix it and understand this case ?

  


• Concatenate multiple videos with a black screen interval into one video

  21 mars 2016, par AHC

  I am using ffmpeg to join a bunch of videos together.
  I am using the classic join ffmpeg code :
  

  ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4

  but the problem is that the videos are of different formats, encodings, but the same size : all 640x480. I want to join them all and put a black screen video with no sound every other video :

  video1 + black_screen_video + video2 + black_screen_video + video3 ...

  I generated a black screen video of 2 seconds duration using :

  ffmpeg -f lavfi -i color=c=black:s=640x480:d=2 black_screen_video.mp4

  so all of the videos are of the same size : 640x480, and 25 fps but different codecs. The videos have sound, except for the black screen video.
  I can’t do anything manual, because the number of videos are around several hundred. So it has got to be an automatic way to do all this.

  When I joined them together using the above code, the resulting video does not play correctly at all.

  I know that I have to re-encode them, but how to do this to all these videos at once, with one line of code ?

  Update :
  I am already using with success this code to join them together, but only three, if I have more than one hundred, it is time consuming to write down one by one :

  ffmpeg -i vid1.avi -i vid2.avi -i vid3.avi -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  but this is joining only the videos, not looping the black screen video. When I do with black screen, ffmpeg gives me stream matching errors.

• How to efficiently create H264 mpeg from two clips with known different motion intensity ?

  14 février 2017, par Serge

  Given an audio and an image we create a static image "video" and then append a short clip that has a rather intense motion.

  Audio and image varies from run to run. Appended animation is always the same. Rendering is done with ffmpeg on a remote server. Rendered file must be in h264 codec mpg.

  Speed of encoding is crucial. Is there a fast and effective way to generate and merge the two clips quickly ?

  Atm we use the following ffmpeg commands :

  // create first clip from image
  
  ffmpeg -loop 1 -r 24 -i $IMAGE -i $AUDIO -t $AUDIO_LENGTH -c:a aac -profile:a aac_low -ar 48000 -b:a 192k -bsf:a aac_adtstoasc -strict -2 -y -c:v libx264 -profile:v high -preset veryfast  -tune stillimage -crf 24 -x264opts bframes=2 -pix_fmt yuv420p -safe 0  clip1.mpg
  
  // . . .
  
  // then append the animation
  
  ffmpeg -f concat -safe 0 -i list.txt -c copy -y -safe 0 final.mpg 

  Intuition is that we can benefit form knowing exact timing of a first clip with a static image and the second one with intense animation – like it is determined in the 1-st pass of a 2-pass compression.

  Someone experienced in tech of h264 codec and mpeg please advice.