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• Overlay with fade in-out not showing

  3 mai 2018, par Pier Giorgio Misley

  I can actually add an overlay image in the center of a video from a start time A to an end time B.

  Reading here and there I tried to add a fade-in/fade-out effect to my overlayed image but the result is the image not showing at all in my final video.

  This is my "experiment" :

  -i output.mp4 -i 1.png -filter_complex "[1:v]format=rgba,scale=300:300,fade=in:st=0:d=1:alpha=1,fade=out:st=5:d=1[im];[0][im]overlay=(main_w-overlay_w)/2:(main_h - overlay_h) / 2:enable='between(t,0,5)'" -pix_fmt yuv420p -c:a copy output_0.mp4

  If in understood :

  fade=in:st=0:d=1

  Means that the image should appear at 0’’ with a fade-in effect of 1’’ duration

  fade=out:st=5:d=1

  Means that the image should disappear at 5’’ with a fade-out effect of 1’’ duration

  Isn’t it ?

  Second part would be to add a zoom effect of the image when it is fading in, can I combine the fade-in and the zoom effect toghether ?

  I think that something like this should zoom for a duration of 3 seconds my image overlay, can I add it with another "," separating the filter to the overlayed image ?

  zoompan=z='if(lte(zoom,1.0),1.5,max(1.001,zoom-0.0015))':d=3

  Thanks

  edit :

  The video is 10 sec long. I want an image to be shown with fade in-out and zoom in from 0 to 5 and another from 5 to 10 with the same effect

  Step 1 : adding fade in-out

  -i 0_vid.mp4 -loop 1 -t 1 -i 1.png -filter_complex "[1:v]format=rgba,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[im];[0][im]overlay=(main_w-overlay_w)/2:(main_h - overlay_h)/2:shortest=1" -pix_fmt yuv420p -c:a copy output_0.mp4

  With this solution the fade in works, but the fade out is not even taken in consideration.

  If I add the zoom :

  -i 0_vid.mp4 -loop 1 -t 1 -i 1.png -filter_complex "[1:v]format=rgba,zoompan=z='if(lte(zoom,1.0),1.5,max(1.3875,zoom-0.0015))':d=625,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[im];[0][im]overlay=(main_w-overlay_w)/2:(main_h - overlay_h)/2:shortest=1" -pix_fmt yuv420p -c:a copy output_0.mp4

  This way the image is stretched full screen width and the height is cut. But during the 5 sec animation the image is not resized as normal.

  What I’m aiming for is the image to be zoomed in the video but not to be cut/stretched. I would like to have the image to look smaller at the start and bigger at the end. Is it possible ?

  And also, what am I doing wrong with fade out animation

• FFmpeg - blurry or transparent outlines [duplicate]

  10 avril 2020, par q55awr

  I'm merging a bunch of videos into one and I'm looking for a specific effect / technique to add to a each of those videos. But I don't exactly know what that effect is called and how to achive it by ffmpeg.

  



  I would describe the outcome as a video with 3 columns . In the center you got the actual video and left and right there's a blurry version of that same video.

  



  Is something like this possible with ffmpeg ?

  



  Example :


  


• HTML5 Media and Accessibility presentation

  23 février 2010, par silvia

  Today, I was invited to give a talk at my old workplace CSIRO about the HTML5 media elements and accessibility. A lot of the things that have gone into Ogg and that are now being worked on in the W3C in different working groups – including the Media Fragments and HTML5 WGs – were also (...)