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• ffmpeg-Error "Buffer queue overflow, dropping." when merging two videos with delay

  20 septembre 2016, par Stefan Urbansky

  I want to merge two videos (as example the iphone video from https://peach.blender.org/trailer-page/). The videos are placed on an background image with the overlay filter and the second video starts 3 seconds later.

  And I need that the audio is mixed.

  Here is my code :

  ffmpeg \
  
      -loop 1 -i background.png  \
  
      -itsoffset 0  -i trailer_iphone.m4v \
  
      -itsoffset 3  -i trailer_iphone.m4v \
  
      \
  
      -y \
  
      -t 36 \
  
      -filter_complex "
  
          [2:a] adelay=3000 [2delayed];
  
          [1:a][2delayed] amerge=inputs=2 [audio];
  
          [0][1:v] overlay=10:10:enable='between(t,0,33)' [lv1];
  
          [lv1][2:v] overlay=10:300:enable='between(t,0,36)' [video]
  
      " \
  
      \
  
      -threads 0 \
  
      -map "[video]" -map "[audio]" \
  
      -vcodec libx264 -acodec aac \
  
      merged-video.mp4

  I get the error message :

  [Parsed_overlay_3 @ 0x7fe892502ac0] [framesync @ 0x7fe892502b88] Buffer queue overflow, dropping.

  And the merged video has many dropped frames.

  I know that are some other posting with this error message. But the suggested solutions doesn’t work for me.

  How can I fix the problem ?

• Making a movie from the url using ffmpeg and phantomjs

  1er novembre 2016, par Matt

  Im Taking screen shots from a url, using phantomjs using the setIntreval function (25 right now) and then piping the output to the ffmpeg (Using the frame rate -r 24).
  Here is the Code. ffmpeg.js

  var page = require('webpage').create();
  
  page.viewportSize = { width: 1024, height: 768 };
  
  
  
  page.open('http://ewoken.github.io/Leaflet.MovingMarker/', function () {
  
    setInterval(function() {
  
      page.render('/dev/stdout', { format: "png" });
  
    }, 25);
  
  });

  Then I run the script using this.

  phantomjs ffmpeg.js | ffmpeg -y -c:v png -f image2pipe -r 24 -t 10 -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart output.mp4

  Like In the command Im getting the 10 sec video with the page, But Its all speeding up fast first and completely freezes with a last frame.

  Can you guys help me, with a work around, enabling me to record the page , AS IS ? Like if there is a 3000 delay animation in the movie, It should appear like real in the movie, like smooth and in real time.

  Thank you guys. Stuck on this for a long time now.

  Cheers,

• shell - looping command with several variables

  19 janvier 2017, par o_ren

  I’m running an FFmpeg command from a script which takes several arguments and passes them to the command.
  

  #!/bin/bash
  
  
  
  while getopts "i:b:" flag
  
  do
  
    case "$flag" in
  
      i) input="$OPTARG";;
  
      b) IFS=, read -a bitrate <<< "$OPTARG";;
  
    esac
  
  done
  
  
  
  for rate in "${bitrate[@]}";
  
    do
  
      ffmpeg -i $input -video_size 100x100 -b:v $bitrate -y output.mp4
  
    done
  
  
  
  exit

  I use getopts to take the variables and for loop to run the command.
  To run the script I use script.sh -i input.mov -b 1000,2000,3000 and FFmpeg runs 3 times, each with different $bitrate value.

  What if I want to pass another var - scale, to the command and run it like this :
  script.sh -b 1000,2000,3000 -s 100x100,200x200,300x300 so the first run would use -b 1000 and -s 100x100, second run use -b 2000 and -s 200x200 and so on.
  Is this posooble ? I would like to keep using getopts if possible.