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• perturbation of an audio/video decoding execution trace with gstreamer

  9 mars 2013, par KKc

  I am a new comer in gstreamer community and i have a pipeline to decode and trace a .mp4 file.

  gst-launch --gst debug=filesrc:7,queue:7,audioconvert:7,audioresample:7,qtdemux:7,faad:7,ffmpeg:7,audioresample:7,audioconvert:7,autoaudiosink:7,autovideosink:7,  filesrc location=...! qtdemux name=demuxer demuxer. ! queue ! faad ! audioconvert ! audioresample ! autoaudiosink demuxer. ! queue ! ffdec_h264 ! ffmpegcolorspace ! autovideosink > file1

  I inserted the "identity" component to disturb the decoding, and effectively, i saw images which became very slow and sound disappeared.
  I used this command :

  gst-launch --gst debug=filesrc:7,queue:7,audioconvert:7,audioresample:7,qtdemux:7,faad:7,ffmpeg:7,audioresample:7,audioconvert:7,autoaudiosink:7,autovideosink:7,  filesrc location=...! qtdemux name=demuxer demuxer. ! queue ! faad ! audioconvert ! audioresample ! autoaudiosink demuxer. ! queue ! identity sleep-time=1000000 ! ffdec_h264 ! ffmpegcolorspace ! autovideosink > file2

  The first time i did this execution, two new functions appeared in file2,

  (i) gst_ffmpegdec_chain...'skipping...',

  (ii) gst_ffmpegdec_video_frame...'Dropping..'

  I assumed that the meaning is that some data were dropped or something else

  However, since many days, i use the same pipelines, with the same video to decode ; i obtain the same bad visualization, but any new function in file 2 :(
  the only difference is the number of occurrence of the functions below :

  *gst_ffmpegdec_update_qos :...'update* 558 times in one case

  *gst_ffmpegdec_update_qos :...'update* 4 times in the other case

  I don't know why i am unable to produce again a disturbed trace with 'skipping..' and 'dropping..'

  My questions are :

  1- have you any idea about the meaning of the above functions ?

  2- Do you know any other component useful to disturb a A/V decoding processing ?

  Thank you for any reply

• 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

• Use FFMpeg libraries to read an audio file while it is being generated

  12 mai 2019, par EyAl

  I got an audio engine, which generates aac files. I want to mux this audio with some video. I’m using ffmpeg libraries to do just that - meaning, after the audio file is ready, I read it and mux it.
  Now - for performance reasons, I don’t want to wait until the audio engine completes the audio generation, I want the muxer to start reading the audio while it is being generated.
  Can I achieve that using the FFMpeg libraries ?
  Which approach should I take ?
  Couldn’t find any examples doing that