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• ffmpeg streaming simultaneously synchronized delay to multiple social networks

  4 avril 2021, par Jintor

  I'm able to stream simultaneously using ffmpeg to youtube, twitter, facebook, twitch ... simultaneously BUT the issue is the following : each network have their own delay

  


  in 1 network : 15 seconds delay, an other : 10 seconds delay, etc

  


  I tried 2 different ways

  


  • 1 ffmpeg per network => Signal is strong and stable

  


  • 1 ffmpeg with tee muxer to many at once => horrible, unstable, 1 network accepts it and some other says signal poor or too low bitrate...

  


  ----------- for example I use this for each social network ------------------------------

  


  /usr/bin/ffmpeg -re -i input.mp4 -deinterlace -c:v libx264 -pix_fmt yuv420p 
-preset veryfast -tune zerolatency -c:a aac -b:a 128k -ac 2 -crf 18 -r 30 -g 60  
-b:v 2369k -minrate 2369k -maxrate 2369k -ar 44100 -qscale:v 2 -vf "scale=-2:1080" 
-profile:v main -bufsize 2369k -f flv "rtmp://a.rtmp.youtube.com/live2/key"


  


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  • I know that it's a case by case basis and not easy to do, but Is there a way to "fake" a delay with ffmpeg (like youtube->x delay, facebook-> y delay, etc) ?

    


  


  • or is there any synchronizing mechanism or timing option in ffmpeg ?

    


  


  • or any other approach ?

    


  


  


• Idea on how to make video maker website ?

  13 octobre 2015, par Gulam Gajani

  I want to create website that create video and user can share that website in any social site.

  (example sites :

  1. flixpress.com
  2. studio.stupeflix.com
  3. www.photodex.com
  4. www.picovico.com )

  this type of website i want to create.After long research and come to conclusion to use imagemagick and ffmpeg for my website.I learn the basic of the ffmpeg and imagemagick.
  SO I create code like this
  for text overlay in ffmpeg i create code like this

     ffmpeg -i input.mp4 -vf drawtext="fontfile=/usr/share/fonts/TTF/Vera.ttf: \
  
          text='Stack Overflow': fontcolor=white: fontsize=24: box=1: boxcolor=black: \
  
          x=(w-text_w)/2: y=(h-text_h-line_h)/2" -codec:a copy output.flv

  and for imagemagick use convert to make pics and make slideshow with ffmpeg code.

   shell_exec(" ffmpeg -framerate 1*10 -i %d.png -c:v libx264 -r 30 -pix_fmt yuv420p out1.mp4");

  This code works fine.No error, nothing.
  But the output video does not have the quality that i wanted.
  My question is that for create website like i mentioned above.Am i using the right software (ffmpeg and imagemagick).what software or code this type of website used ? Any idea ? any opensource software or program for this ?
  I am just newbie and try to learn the things.
  Please provide guidance on this what i am doing wrong.Just give the software name of programe which is used for this type of website. I can go through by myself. Please Give some idea on this.

• ffmpeg chromakey filter : blend parameter does not what it should

  5 mai 2017, par Mat

  I want to remove greenscreen background and am not completely satisfied with what I have achieved because I still have green borders (especially on semi-transparent areas like hair, when I move my head).

  The documentation for the blend-parameter of chromakey filter says

  blend

  Blend percentage.

  0.0 makes pixels either fully transparent, or not transparent at all.

  Higher values result in semi-transparent pixels, with a higher transparency the more similar the pixels color is to the key color.

  So I reckoned, I could use this to minimise greenscreen bleeding (is this the term ?) when removing the background with a command like this :

  ffmpeg -i DSCN0015.MOV -vf "[in] hqdn3d=4:4:8:8 [dn]; [dn] scale=iw*3:-1 [sc]; [sc] chromakey=0x005d0b:0.125:0.0 [out]" -r 24 -an -c:v ffvhuff 4.mov

  But when I use anything else than 0.0 for blend, it seems to determine some kind of MINIMUM transparency and the entire frame is affected.

  Here are some pics to visualize : the first is the raw material from the camera. the 2nd shows what I get with blend=0.0 and the last one shows the problem : blend=0.5, but the whole frame is almost completely transparent.

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