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• mmpeg changing the bitrate and file size of resulting file

  17 août 2019, par Paco Abato

  I’m using ffmpeg within a Python script (using mmpeg-python) in order to change metadata values but the bitrates and file size are also changed in the resulting video (bitrates are ’Velocidad de datos’ and ’Velocidad de bits’, sorry for non-english GUI) :

  

  The command I use is the following (removed the metadata part because the result is the same : the bitrate and the file size being changed) :

  import ffmpeg
  
  
  
  ifile = 'borrar.mp4'
  
  ofile = 'res.mp4'
  
  ffmpeg.input(ifile).output(ofile).run()

  How to preserve bitrates and so an aproximate file size.

  Thanks in advance.

• Perl and ffmpeg script

  21 novembre 2016, par armight29

  The first part of my script that asks whether to check for cinavia doesn’t work. That is, if I type in ’y’ or ’Y’ it doesn’t proceed to the CNVIACHk function but goes instead to the MVIEPARAMs function.

  # GET FILE INPUT..
  
  
  
  print "Enter Filename..";
  
  my $MOVIe = <stdin>;
  
  
  
  print "Check For Cinavia? Enter y or n\n";
  
  my $CNVIAQUESt = <stdin>;
  
  
  
  if ( $CNVIAQUESt eq "y" || $CNVIAQUESt eq "Y" ) {
  
      CNVIACHk( $MOVIe );
  
  }
  
  else {
  
      MVIEPARAMs( $MOVIe );
  
  }
  
  
  
  
  
  sub MVIEPARAMs {
  
  
  
      system(
  
          "ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 $MOVIe"
  
      );
  
  
  
      print "Duration In Seconds..";
  
      $DURATIOn = <stdin>;
  
  
  
      system(
  
          'ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width "$MOVIe"'
  
      );
  
  
  
      print "Movie Width? ";
  
      $MOVIEWIDTh = <stdin>;
  
  
  
      print "Movie Height? ";
  
      $MOVIEHEIGHt = <stdin>;
  
  
  
      print "Enter Target Width.. ";
  
      $TARGETWIDTh = <stdin>;
  
  
  
      print "Enter Target Height.. ";
  
      $TARGETHEIGHt = <stdin>;
  
  
  
      system(
  
          'ffprobe -show_entries stream=index,codec_type:stream_tags=language -of compact "$MOVIe" -v 0 | grep eng'
  
      );
  
  
  
      print "Enter number of English Audio Track.. ";
  
      $ENGAUDTRk = <stdin>;
  
  
  
      print "English Audio Track Number Is ", $ENGAUDTRk, ".";
  
      $BTRTe = 31875072 / $DURATIOn;
  
  
  
      DETRMNEPAd;
  
  }
  
  
  
  
  
  sub DETRMNEPAd {
  
  
  
      if ( $MOVIEWIDTh &lt; $TARGETWIDTh ) {
  
          $X = $TARGETWIDTh - $MOVIEWIDTh / 2;
  
      }
  
      elsif ( $MOVIEHEIGHt &lt; $TARGETHEIGHt ) {
  
          $Y = $TARGETHEIGHt - $MOVIEHEIGHt / 2;
  
          $X = 0;
  
          print $Y;
  
      }
  
      else {
  
          print "Padding Not Needed Moving On...";
  
          CNVRTWOPAd();
  
      }
  
  
  
      CNVRTWPAd();
  
  }
  
  
  
  
  
  sub CNVIACHk {
  
  
  
      print "Checking Movie For Cinavia.. ";
  
      system( "cinde -i $MOVIe -q high -l" );
  
  
  
      print "Enter Track To Check.. ";
  
      $TRKTOCHEk = <stdin>;
  
  
  
      system( "cinde -i $MOVIe -q high -t $TRKTOCHEk" );
  
  
  
      print "Was Cinavia Detected?";
  
      $CNVIACHKANSr = <stdin>;
  
  
  
      if ( $CNVIACHKANSr eq "y" ) {
  
          exit;
  
      }
  
      else {
  
  
  
          print "Would You Like To Check Another Track?";
  
          $CHKANTHRTRk = <stdin>;
  
  
  
          if ( $CHKANTHRTRk eq "y" ) {
  
              CNVIACHk();
  
          }
  
          else {
  
              MVIEPARAMs();
  
          }
  
      }
  
  }
  
  
  
  
  
  sub CNVRTWOPAd {
  
  
  
      print "BEGINNING CONVERSION...\n";
  
  
  
      print "What Preset Would You Like To Use?";
  
      $PRESEt = <stdin>;
  
  
  
      system(
  
          "ffmpeg -i $MOVIe -map 0:0 -map 0:$ENGAUDTRk -c:v libx264 -b:v $BTRTe -preset $PRESEt -strict -2 -c:a ac3 -b:a 192k -threads 12 -pass 1 -f matroska dummy &amp;&amp; ",
  
          "ffmpeg -i $MOVIe -map 0:0 -map 0:$ENGAUDTRk -c:v libx264 -b:v $BTRTe -preset $PRESEt -strict -2 -c:a ac3 -b:a 192k -threads 12 -pass 2 -f matroska ENCODE1.mkv"
  
      );
  
  }
  
  
  
  
  
  sub CNVRTWPAd {
  
  
  
      print "BEGINNING CONVERSION...\n";
  
  
  
      print "What Preset Would You Like To Use?";
  
      my $PRESEt = <stdin>;
  
  
  
      system(
  
          "ffmpeg -i $MOVIe -map 0:0 -map 0:$ENGAUDTRk -c:v libx264 -b:v $BTRTe -preset $PRESEt -vf \"pad=$TARGETWIDTh:$TARGETHEIGHt:$X:$Y:black\" -strict -2 -c:a ac3 -b:a 192k ",
  
          " -threads 12 -pass 1 -f matroska dummy &amp;&amp; ffmpeg -i $MOVIe -map 0:0 -map 0:$ENDAUDTRk -c:v libx264 -b:v $BTRTe -preset $PRESEt -vf \"pad=$TARGETWIDTh:$TARGETHEIGHt:$X:$Y:black\"",
  
          " -strict -2 -c:a ac3 -b:a 192k -threads 12 -pass 2 -f matroska ENCODE1.mkv"
  
      );
  
  }
  
  </stdin></stdin></stdin></stdin></stdin></stdin></stdin></stdin></stdin></stdin></stdin></stdin></stdin>

• How to Fix Problem Drawer Text and Join with FFmpeg

  13 août 2019, par Marcos QP

  I have two short videos with good state (input1.mp4, input2.mp4).
  I use ffmpeg to edit videos.

  Part 1
  I combine two videos, it works correctly

  Part 2
  I draw text on input1.mp4, result output1.mp4, it works correctly.
  I join two videos (output1.mp4, input2.mp4), its join success. But result video is corrupt.

  ------------------------------------------------------------------

  I use these comands ffmpeg

  Combine Videos
  ffmpeg -y -f concat -safe 0 -i list.txt -c copy merged.mp4

  Draw Text on Video
  ffmpeg -y -i input1.mp4 -vf "drawtext=fontfile=/Windows/fonts/arialbd.ttf : text=’Some Text’ : fontcolor=white : fontsize=50 : box=1 : boxcolor=black@0.5 : boxborderw=5 : x=(w-text_w)/2 : y=(h-text_h/2)" -codec:a copy output1.mp4

  ------------------------------------------------------------------
  

  Please i need your help to drawer text and join.
  Sorry my bad english. I am still learning.
  Thanks.