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• Ffmpeg : Move a slider "image" over a "background" from 0% to 100% in sync with the audio

  7 février 2014, par Znuff

  I'm trying to create a video using the follwing code :

  `$`ffmpeg -loop 1 -r 5 -i video.png -r 5 -i progress.png -filter_complex "overlay=x='if(gte(t,0), -W+(t)*5, NAN)':y=H-h" -i video.mp3 -acodec copy video.mp4

  I have the following files

  • video.png
    • this is a 1280x720 px still frame that is simply a background with a waveform of the video.mp3 file
  • progress.png
    • this is simply a 1280x100 px semi-transparent image that should simulate an animation (from from 0 to 100% of the width of the video.png file, in order to simulate "fill up" animation.

  My issues are as following :

  • The video is not in sync with the audio. The progress bar is way off, instead of finishing at the end of the song, it just keeps going on and on and on and on...
  • Also... it just keeps going on and on ! I left it create a 1 hour video and it never stopped.

  I know I'm missing something in the filter, but I have no idea how I could fix it.

  Could someone lend me some help ?

• FFMPEG - Difference between "-ab" and "-b:a"

  5 juin 2018, par Playa

  As far as i know both Commandline Args change the Audio Bitrate, but ime not exactly sure because i have also seen them in combination.
  Basically i couldn’t find any Documentation that explains both of these Commands. It could also be that -ab got replaced with -b:a but ime not exactly sure.

  TY

• Echoprint-codegen perpetual "error" :"could not decode" from shell_exec

  16 janvier 2016, par sid405

  I am trying to run codegen from popen (shell_exec creates the same scenario) in php in my Mac lion MAMP box as follows :

  $handle = popen('echoprint-codegen "/Applications/MAMP/htdocs/projectx/codegen/2.mp3" 10 30', 'r')
  
  
  
  echo "'$handle'; " . gettype($handle) . "\n";
  
  $read = fread($handle, 2096);
  
  echo $read;
  
  pclose($handle);

  But i am perpetually met with

  "error":"could not decode", "tag":0, "metadata":{"filename":"/Applications/MAMP/htdocs/projectx/codegen/2.mp3"}}

  No matter how i format the cmd inside the handle, with various variations of single and dbl quotes i still get the same thing.

  codegen is in the path and so is ffmpeg.

  Here’s the kicker. Codegen works fine from command line and so does the php script with the popen() or the shell_exec().

  From browser it won’t work.

  Any ideas ?

  Thank you in advance