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• Output a video made of several video chunks of the input video

  21 mai 2013, par mad

  I was wondering if it was possible to output a video made of several extracts of the input video.
  For example outputting a video made of the first 10s of each minute of the input.

  I know you can do it programmatically, calling ffmpeg several times with -ss and -t to make the chunks and then merge them, but is it possible to do it in one command using video filters ?

• How to convert a 16:9 video to 4:3 video with top & bottom blurred video bars by using ffmpeg ?

  27 décembre 2018, par Wai Gyi

  I would like to convert a landscape video to a square video with blur bars at top and bottom.

  I tried to adapt the commands from the following link but not succeeded.

  FFmpeg : How to convert horizontal video 16:9 to vertical video 9:16, with blurred background on top and bottom sides

  So, can someone share a ffmpeg command with me ?

  Thank you very much for your help.

  Update : I tried again and get a working command. Please check and review.

      ffmpeg -i in.mp4 -lavfi "[0:v]scale=iw:iw*3/4,boxblur=luma_radius=min(h\,w)/40:luma_power=3:chroma_radius=min(cw\,ch)/40:chroma_power=1[bg];[bg][0:v]overlay=(W-w)/2:(H-h)/2,setsar=1,crop=h=iw*3/4" out.mp4

• avfilter/af_stereotools : round-up max size of buffer

  20 décembre 2023, par Paul B Mahol

  avfilter/af_stereotools : round-up max size of buffer
  Fixes : out of array access
  
  Fixes : tickets/10747/poc14ffmpeg
  Found-by : Zeng Yunxiang and Song Jiaxuan
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/af_stereotools.c