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• FFMPEG scene detection : overlay original frame number

  21 décembre 2020, par Fugi

  I'm able to extract all frames that are not similar to the previous frame from a video file using ffmpeg -i video.mp4 -vf "select=gt(scene\,0.003),setpts=N/(30*TB)" frame%d.jpg (source)

  


  I would like to overlay the frame number onto each selected frame. I tried adding drawtext=fontfile=/Windows/Fonts/Arial.ttf: text='frame\: %{frame_num}': x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x00000000@1: fontsize=30 to the filter after select and setpts, however %frame_num returns 1, 2, 3, ... (source)

  


  If I put drawtext before select and setpts, I get something like 16, 42, 181, ... as frame numbers (which is exactly what I want), but since the scene detection runs after adding the text overlay, changes in the overlay may be detected as well.

  


  Is it possible to do the scene detection and overlay independently from another ? [in] split [out0][out1] can be used to apply filters separately, but I don't know how to "combine" the results again.

  


• RoutingError No route matches GET videos/original/missing.png

  4 novembre 2015, par D.Graves

  Okay so Im having an issue uploading videos using paperclip av transcoder. Im getting just a blank black image for my video and cant play anything. So no error pops up online but on my GitBash I see an ActionController Routing Error.

  This is the Error I see in my Gitbash
  

  My model that has the video :

  class Pin < ActiveRecord::Base
  
   belongs_to :user
  
   has_attached_file :video, :styles => {
  
  :medium => { :geometry => "640x480", :format => 'mp4' },
  
  :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
   }, :processors => [:transcoder]
  
  
  
  validates_attachment_content_type :video, :content_type => ["video/mp4",     "video.mov", "video/mpeg","video/mpeg4", "image/jpg", "image/jpeg"]
  
  
  
  end

  My show view for the video :

  <%= video_tag @pin.video.url %>
  
  
  
  <p>
  
   <strong>Description:</strong>
  
   &lt;%= @pin.description %>
  
  </p>
  
  
  
  &lt;% if @pin.user == current_user %>
  
  &lt;%= link_to 'Edit', edit_pin_path(@pin) %>
  
  &lt;% end %>
  
  &lt;%= link_to 'Back', pins_path %>

  I believe I installed ffmpeg correct and here is what it shows on my Gitbash for my version of ffmpeg

  

  I also have the newest version of paperclip and paperclip av transcoder installed. Am I just missing a route ? If you all need any other code to maybe help just let me know and ill post it

• ffmpeg scale down video dynamically (squeeze-back) or zoompan out to smaller than original

  27 avril, par Sam

  I have 2 videos, I'm trying to overlay one on top of the other, and have it shrink down in an animated fashion until it appears like a picture-in-picture setup. Then, after a few seconds it should scale back up.

  


  This is what I am trying to achieve (these would be videos, not images) :


  


  This is the closest I've been able to get, but, crucially, zoompanning "out" (as opposed to "in") does not appear to work ; so, of course, this does not work :

  


  ffmpeg -i bg.mov -i top.mov -filter_complex "[0:v]zoompan=z='pzoom-0.1':d=1, setpts=PTS-STARTPTS[top]; [1:v]setpts=PTS-STARTPTS+2/TB, scale=1920x1080, format=yuva420p,colorchannelmixer=aa=1.0[bottom]; [top][bottom]overlay=shortest=0" -vcodec libx264 out.mp4

  


  Is this achievable with ffmpeg ?