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• How to optimize FFMPEG/ Chromacast video ?

  5 août 2021, par Hasan

  Re-broadcast a live broadcast by chromecasting it. The code below delays 5 seconds.

  


  Server I use :
https://instances.vantage.sh/?selected=c5.2xlarge

  


  Can you help me optimize the code ?

  


  chromakey.sh

  


  
# Combine two files using a chromakey effects
filter_complex(){
  local videoWith="${1:-1920}"  # Video Size
  local videoHeight="${2:-1080}"  # Video Size
  local key="${3:-00FF00}"      # Colorkey colour - default vaue is 0000FF or green
  local colorSim="${4:-0.2}"    # Colorkey similarity level - default value is 0.2
  local colorBlend="${5:-0.1}"  # Colorkey blending level - default value is 0.1

  # Update color variable according to user input
  # This makes the matching case insensitive
  if [[ $3 =~ ^[0-9A-F]{6}$ ]]; then
    key=$3
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "blue" ]]; then
    key="0000FF"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "green" ]]; then
    key="00FF00"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "red" ]]; then
    key="FF0000"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "purple" ]]; then
    key="0000FF"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "orange" ]]; then
    key="ff9900"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "yellow" ]]; then
    key="FFFF00"
  fi

  
  filterString="[1:v]scale=$videoWith x $videoHeight,chromakey=0 x $key:$colorSim:$colorBlend[ckout];[0:v]scale=(iw*sar)*max($videoWith/(iw*sar)\,$videoHeight/ih):ih*max($videoWith/(iw*sar)\,$videoHeight/ih), crop=$videoWith:$videoHeight[bg];[bg][ckout]overlay[out]"
  
  printf '%s%s%s%s%s' $filterString
}

ffmpeg -re -stream_loop -1 -i "${1}" -i "${2}" -preset ultrafast -filter_complex "$(filter_complex "${@:4}")" -map '[out]' -c:v libx264 -f flv "${3}"


  


  Usage : ./chromakey.sh mask.mp4 http://example.com/live/broadcast_orj rtmp ://example.com/live/broadcast_greenscreen 1920 1080 green 0.1 0.2

  


• ffmpeg - adding Dynamic logo & random position watermark to video ?

  9 août 2021, par JackS

  I am making a tutorial for sending through mail to my uses, and to avoid piracy distribution I thought to put watermarks (logo.png) at random places at interval on the videos.

  


  I tried using the command from ffmpeg - Dynamic letters and random position watermark to video ? :

  


  ffmpeg -i input.mp4 \
-vf \
"drawtext=fontfile=font.ttf:fontsize=80:fontcolor=yellow@0.5:text='studentname': \
 x=if(eq(mod(t\,30)\,0)\,rand(0\,(W-tw))\,x): \
 y=if(eq(mod(t\,30)\,0)\,rand(0\,(H-th))\,y)" \
-c:v libx264 -crf 23 -c:a copy output.mp4


  


  But it gave me error :

  


  [NULL @ 0x55c812525600] Unable to find a suitable output format for '\'
\: Invalid argument


  


• how to change ffmpeg xstack background color

  17 août 2021, par Abdelsalam ElTamawy

  I creating a 2x2 grid of videos but only had 3 videos. So I created an xstack of these 3 videos. The bottom right corner does not get a video. This causes it to be left to FFmpeg default colour.

  


  Here is the command I use to create the video mosaic :

  


  ffmpeg -i TEST.mkv -i TEST.mkv -i TEST.mkv -filter_complex "
[0:v] scale=960x540 [a0];
[1:v] scale=960x540 [a1];
[2:v] scale=960x540 [a2];
[a0][a1][a2] xstack=inputs=3:layout=0_0|0_h0|w0_0[out]"
 -map "[out]" -f matroska - | ffplay -


  


  

  


  How can I make the green corner black or any other colour ?

  


  I'm using FFmpeg version 4.4