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• plot freezedetect and blackdetect graphs ffmpeg

  7 juillet 2021, par Anup

  I want to plot freezedetect and blackdetect responses from ffmpeg onto a graph. Is there any method to do it ?

  


  Example : A line graph with frames/ seconds in the x-axis, that will have a value 1 when no freeze or black screen, and 0 when it detects an anomaly.

  


  Any pointers would be helpful. Thanks in advance.

  


• Creating a convertAll() function that converts all .filetype in working directory

  5 janvier 2019, par Risviltsov

  I seem to not know proper bash syntax ; despite this, I’ve tried to create a tool that changes the dimensions of all files of a ffmpeg-accepted filetype in the working directory and converts it to another ffmpeg-accepted filetype. In this instance, this tool converts all .webm files over 1080x720 into 1080x-1 or -1x720 .mp4 files. If the .webm file is under 1080x720, the new .mp4 file will have the same dimensions.

  However, there’s a wrench in the tool.

  convertAll () {
  
  local wantedWidth = 1080
  
  local wantedHeight = 720
  
  for i in *.webm; do
  
  local newWidth = $i.width
  
  local newHeight = $i.height
  
  until [$newWidth <= $wantedWidth && $newHeight <= $wantedHeight]; do
  
  if [$videoWidth > $wantedWidth]; then
  
  newHeight = $newWidth*($wantedWidth/$newWidth)
  
  newWidth = $newWidth*($wantedWidth/$newWidth)
  
  fi
  
  if [$videoHeight > $wantedHeight]; then
  
  newWidth = $newWidth*($wantedHeight/$newHeight)
  
  newHeight = $newHeight*($wantedHeight/$newHeight)
  
  fi
  
  done
  
  ffmpeg -i "$i" -vf scale=$newWidth:$newHeight "${i%.*}.mp4";
  
  done
  
  echo "All files have been converted."
  
  }

  What this returns is a bunch of lines that look like this :

  bash: [: missing ']'
  
  bash: [: missing ']'
  
  bash: =: No such file or directory

  My best guess is that BASH can’t do mathematics, and that I’m declaring and editing my variables incorrectly.

  I’d like some input on this --- my lack of experience is really getting me here.

• How to compress video at client side before uploading it to server without installing anything at client side ?

  25 janvier 2019, par Harpreet singh Bains

  We have application in which client have to upload video using interface so we just want to compress that video at client side before upload it to server , without installing anything at client machine . It this possible ,if possible then how ??

  i have used ffmpeg javascript compiles code too but for that also we have to install ffmpeg locally.