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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.

  


• Concatenate a large number of videos with moviepy

  10 décembre 2016, par Anis Souames

  I’m using moviepy to create compilations automatically, I have around 20 mp4 videos with less than 2 mins each that are concatenated into one large video file using moviepy .
  However I’m facing a lot of difficulty because each time I try to concatenate this large number of videos I get an OSError: Cannot Allocate Memory Error . So the way I’m doing it is that I first create one part with 10 vids and a second part with 10 vids and then concat both of them. this method works however it’s very time and cpu consuming .

  Is there a straight forward way to concatenate a large number of videos ? My bot is running on an Ubuntu Server with 1GB of RAM and 10 GB of disk space . For 20 typical vids I have approxiamtely 60MB of vids to get processed and compiled . 1GB of ram should handle this without any problem. :

  Here’s the code I’m using :

  for video_name in videos_filename[0:len(videos_filename)/2]:
  
      try:
  
          print video_name
  
          clip = mv.VideoFileClip(video_name, audio=True)
  
          clip = clip.resize(width=720, height=480)
  
          video_clips.append(clip)
  
      except:
  
          print "Error in adding clips.... Part 1"
  
      pdb.set_trace()
  
      final_clip = mv.concatenate_videoclips(clips=video_clips, method="compose")
  
      finalFile = mv.write_videofile(someName, fps=60, codec="libx264")

  I’m sure that the mv.concatenate_videoclips(clips=video_clips, method="compose) is responsible for the error that I’m getting, How can I fix that and stop using a partial solution ? Should I quit moviepy and use another module ? Maybe ffmpeg directly ?

• Adjust the max number of files inside of the resize callback. Fixes #1106.

  21 mars 2012, par Sebastian Tschan

  m js/jquery.fileupload-ui.js Adjust the max number of files inside of the resize callback. Fixes #1106.