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• undefined reference to `x264_encoder_open_125'

  18 juin 2013, par Vishal

  While installing ffmpeg on Ubuntu 12.04

  I am getting following error

  libavcodec/libavcodec.a(libx264.o): In function `X264_init':
  
  /root/ffmpeg/libavcodec/libx264.c:492: undefined reference to `x264_encoder_open_125'
  
  collect2: ld returned 1 exit status
  
  make: *** [ffmpeg_g] Error 1

  I am following the instructions given at
  http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide

  Do anyone have idea about this error ?

• FFMPEG : Fade the video out when ended

  21 septembre 2015, par kenicky

  In this link : https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

  I tweaked the code they provided to end the encoding in a specific time.

  Now I wanted to fade out the video to black when it is ended.

  Thanks.

• is it possible to have other text blend effects in ffmpeg other than transparency ? eg multiply or difference

  26 mars 2023, par shelbypereira

  In ffmpeg it is straightforward using alpha to set a transparency when using drawtext, but is it possible to have more complex effects ? eg if I want to blend text using difference or multiply ?

  


  I am guessing it is not possible with drawtext directly is it possible to simulate this using other features of ffmpeg ?

  


  The blend functionality is extremely powerful :
https://trac.ffmpeg.org/wiki/Blend

  


  But I don't see how I can add text to a video with drawtext and use those blending options.