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• How to choose the thumbnail of the first video instead of the second video when you concatenate them with FFMPEG ?

  4 octobre 2018, par Lanh Dien Xa Tam

  I’ve been using FFMPEG to bulk add outro to my videos. This is the code I use :

  for %%f in (*.mp4) do (
  
    echo.>%%f.txt
  
    echo file '%%f' >> %%f.txt
  
    echo file 'outro/outro.mp4' >> %%f.txt
  
  )
  
  
  
  for %%f in (*.txt) do (
  
     ffmpeg -f concat -i %%f -c copy concatenated/%%f.mp4
  
  )

  The problem is the thumbnail of the output videos is always is the second video’s (the outro) but not the first. Does anybody here know how to pick the first video thumbnail to be the output’s thumbnail instead of the second’s ?

• How do I make FFMPEG use localized strftime with drawtext ?

  3 décembre 2022, par Randy Michnovicz

  I'm trying to write a script to use FFMPEG to draw localized timestamps on a video, but I'm not having much luck.

  


  I can confirm I have the locale fr_FR.UTF-8 installed on my system by running the following command : LC_ALL=fr_FR.UTF-8 date

  


  However, the following command produces a 4 second video beginning with the string "Monday 28 November 2022 19:00:47 PST" on both my Mac and an Alpine Linux docker container :

  


  LC_ALL=fr_FR.UTF-8 ffmpeg -hide_banner -f lavfi -i color=size=1024x768:rate=25:color=black -c:v libx264 -c:a aac -filter_complex drawtext=expansion=normal:fontsize=18:fontcolor=white:box=1:boxcolor=black@0.5:text='%{pts\\:localtime\\:1669690847\\:%A %-d %B %Y %X %Z}' -t 4 -y out.mp4

  


  Does anyone know how to make it create strings with non-English text ?

  


• Video Editing with Python : other transitions than crossfade

  11 février 2018, par Jay D.

  I am trying to make various transitions effects for a video-editing python script.

  Moviepy allows me to do crossfades and fades to black, but I would like a bit more diversity to transitions.

  I was thinking about : wipes, blurry wipes, blurs to black and crossblurs. All quite simple transisions types that you can find in basic video editing softwares like Windows Movie Maker.

  Examples of these transitions can be found at :
  https://www.dailymotion.com/video/x6ekx70

  Do you know any solutions ?

  Current research :

  I looked at ffmpeg but I didn t saw a single tutorial online for transitions other than crossfades & fades to black.

  The closest thing I found to my search is MLT Multimedia Framework with "Luma" patterns, working example at : https://youtu.be/t1KV6gy92i0?t=28s

  MLT has python bidings : https://github.com/mltframework/mlt/tree/master/src/swig/python

  But I have absolutely no idea how to implement those "Luma" patterns transitions in a python script.