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• Burning subtitles into video with ffmpeg with specific margin not working

  17 mai 2024, par Anthony

  I am trying to build a tool where people can position their subtitles on an HTML5 video and then I will burn the subtitles into the video for them.

  


  I can easily get the position of the subtitles, in whatever format I need, that's easy. However, no combination of values that I feed to ffmpeg are working.

  


  My holy grail is an x and y offest (aka offset 5% from the left, 10% from the bottom, in terms of video height/width).

  


  To achieve this, I would like the subtitles to start in the very bottom-left corner.

  


  ffmpeg -y -i english.mp4 -vf "subtitles=english.srt:force_style='Alignment=1,OutlineColour=&H100000000,BorderStyle=3,Outline=1,Shadow=0,FontName=Arial,FontSize=24,MarginL=140,MarginV=0'"  -c:v libx264 -crf 23 -c:a copy output_video.mp4


  


  Here is something that is approaching working, but it's behaving very strangely. The video is 850x480 but when I do a margin of 140 it goes way past the midway point of the video.

  


  Am I missing something ? How can I start the margin in the bottom left, and then apply the margin I want to push it away from the left and away from the bottom ? I can do it either as a percentage of the video height/width if that API is supported or just pixels is fine too (but clearly doesn't seem to be working)

  


• How can i live stream with ffmep only selected area of a video

  6 février 2020, par jack the disher

  I am using ffmpeg to livestream. Lets say my video is full size of the picture. But I want to people can see only red area. Is this possible ?

   @echo OFF
  
  Setlocal EnableDelayedExpansion
  
  
  
  : path to ffmpeg
  
  set ffmpeg=C:\FFmpeg\bin\ffmpeg.exe
  
  
  
  : path to ffmpeg
  
  set INPUT=C:\Users\Administrator\Desktop\videolar: encode video
  
  for %%i in (*.mp4) DO "%ffmpeg%" -re -i "%%i" -vcodec libx264 -preset veryfast -maxrate 2500k -bufsize 3368k -vf "format=yuv420p" -g 60 -acodec libmp3lame -b:a 198k -ar 44100 -metadata title="" -metadata artist="" -metadata album_artist="" -metadata album="" -metadata date="" -metadata track="" -metadata genre="" -metadata publisher="" -metadata encoded_by="" -metadata copyright="" -metadata composer="" -metadata performer="" -metadata TIT1="" -metadata TIT3="" -metadata disc="" -metadata TKEY="" -metadata TBPM="" -metadata language="eng" -metadata encoder="" -f flv -s 1280x720 "rtmps://live-api-s.facebook.com:443/rtmp/xxxx"

  example video . real video size is green area. i want to livestream red area without rendering

• avutil/mem : remove av_realloc / av_malloc incompatibility warning

  21 avril 2015, par Michael Niedermayer

  avutil/mem : remove av_realloc / av_malloc incompatibility warning
  memalign() is not guranteed to be compatible with free() or realloc()
  
  and for platforms in this category we have —enable-memalign-hack
  
  (which should be enabled automatically if such system is detected)
  
  Trying to somehow half support systems that can free() memalign memory
  
  but not reallocate it seems not worth the amount of work needed to
  
  keep 2 then incompatible allocation systems and ensure their
  
  seperation. That is unless this would affect a major platform
  
  on which we want to avoid the memalign hack code
  The warnings also cause wasted time and effort as people try
  
  to maintain a separation that does not exist currently.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/mem.h