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• `ffmpeg` `delogo` filter leaving traces at the logo locations

  26 mars 2023, par nlblack323

  I'm using ffmpeg delogo filter to remove these logos

  


  using :

  


  ffmpeg -i vid.mp4 -vf "delogo=x=27:y=158:w=344:h=93, delogo=x=44:y=839:w=531:h=77" out.mp4


  


  but this results in large noticeable marks at both logo locations. Besides, the replaced parts are terribly blurry and barely close to the actual colors. Is there a way to prevent or improve these results ?

  


• How to properly convert RTL subtitles in ffmpeg ?

  25 octobre 2020, par HTMHell

  I'm using the following command to extract subtitles from a video file, and save it as vtt.

  



  ffmpeg -i video.mkv -map 0:s:0 subs.vtt 2>&1


  



  It's working and outputs the subtitles file. The problem is with RTL (right to left) languages (Hebrew, Arabic etc.)
The punctuation are being misplaced.

  



  I will show you an English example of what's happening, for your convenience :

  



  Input text :

  



  Is he alive?
-I don't know.


  



  Output text :

  



  ?Is he alive
.I don't know-


  



  If you want the original text in Hebrew, there it is :

  



  Input Text :

  



  הוא חי?
-אני לא יודע.


  



  Output text :

  



  ?הוא חי
.אני לא יודע-


  



  As you can see, the punctuation marks at the end are going to the start, and vice versa. How can I avoid this behavior ?

  


• Pass UTF8 parameter in powershell

  13 juin 2018, par Dev_MC

  I have to use ffmpeg-normalize (https://github.com/slhck/ffmpeg-normalize) in my project.

  Everything works well except that encoding have trouble on Windows :

  $OutputEncoding = [System.Text.Encoding]::Unicode
  
  $OutputEncoding
  
  Get-WinSystemLocale
  
  pause
  
  Get-ChildItem -path "./" -recurse | foreach ($_) {
  
      if ($_.Extension -eq ".wav") { 
  
      write $_.FullName
  
       ffmpeg-normalize $_.FullName -nt peak -t -20 -o $_.FullName -f
  
       pause
  
      }
  
      if ($_.Extension -eq ".mp4") { 
  
       ffmpeg-normalize $_.FullName -c:a aac -nt peak -t -20 -o $_.FullName -f
  
      }
  
          if ($_.Extension -eq ".mp3") { 
  
       ffmpeg-normalize $_.FullName -c:a libmp3lame -nt peak -t -20 -o $_.FullName -f
  
      }
  
  }

  and here is the display

  BodyName          : utf-16
  
  EncodingName      : Unicode
  
  HeaderName        : utf-16
  
  WebName           : utf-16
  
  WindowsCodePage   : 1200
  
  IsBrowserDisplay  : False
  
  IsBrowserSave     : True
  
  IsMailNewsDisplay : False
  
  IsMailNewsSave    : False
  
  IsSingleByte      : False
  
  EncoderFallback   : System.Text.EncoderReplacementFallback
  
  DecoderFallback   : System.Text.DecoderReplacementFallback
  
  IsReadOnly        : True
  
  CodePage          : 1200
  
  
  
  Parent                         : en
  
  LCID                           : 1033
  
  KeyboardLayoutId               : 1033
  
  Name                           : en-US
  
  IetfLanguageTag                : en-US
  
  DisplayName                    : English (United States)
  
  NativeName                     : English (United States)
  
  EnglishName                    : English (United States)
  
  TwoLetterISOLanguageName       : en
  
  ThreeLetterISOLanguageName     : eng
  
  ThreeLetterWindowsLanguageName : ENU
  
  CompareInfo                    : CompareInfo - en-US
  
  TextInfo                       : TextInfo - en-US
  
  IsNeutralCulture               : False
  
  CultureTypes                   : SpecificCultures, InstalledWin32Cultures, FrameworkCultures
  
  NumberFormat                   : System.Globalization.NumberFormatInfo
  
  DateTimeFormat                 : System.Globalization.DateTimeFormatInfo
  
  Calendar                       : System.Globalization.GregorianCalendar
  
  OptionalCalendars              : {System.Globalization.GregorianCalendar, System.Globalization.GregorianCalendar}
  
  UseUserOverride                : True
  
  IsReadOnly                     : False
  
  
  
  Press Enter to continue...:
  
  C:\Users\user\Desktop\a\b\d\e\audio - Copy.wav
  
  WARNING: Output file only supports one stream. Keeping only first audio stream.
  
  Press Enter to continue...:
  
  C:\Users\user\Desktop\a\b\d\不\audio - Copy.wav
  
  ERROR: file C:\Users\user\Desktop\a\b\d\?\audio - Copy.wav does not exist
  
  Press Enter to continue...:
  
  C:\Users\user\Desktop\a\c\audio - Copy.wav
  
  WARNING: Output file only supports one stream. Keeping only first audio stream.
  
  Press Enter to continue...:

  The program works well on MacOS, so I don’t think it’s a software issue. It looks like PowerShell does not send the parameter to the program correctly.

  Do you have any ideas ?

  Thanks