View source for VLC HowTo/Transcode multiple videos

{{Howto|batch transcode or encode}}
{{Example code|l=GPL}}

== Idea ==
The idea is to use VLC to do some batch work to encode or transcode multiple files one after each other, without having to care about it. 

You may want to transcode all your videotheque to another format to play them on an [[IPod]], a [[Play on Zune|Zune]], a PS3 or a [[Play on Xbox|Xbox]].

== Codecs / Muxers ==
You have to choose the correct codecs for the device you want to transcode for.

We choose here [[H.264]] with [[AAC]] in a [[MPEG-2#TS|MPEG-2/TS]] muxer as an example.

== GUI ==
Batch convert is supported via the {{GUI}} in VLC 3.0.0

If you cannot wait, download a nightly build.  Otherwise, use command-line batch transcoding below.

== Command Lines ==
=== Windows ===
For example, to transcode a batch of m4a files (potentially in multiple subdirectories of a single common root directory) to mp3 files (512kb/s encoding with 44100 sampling frequency) you could use the following code in a Windows XP command prompt:
<big><big><syntaxhighlight lang="dos">
 for %%a in (*.VOB) do "C:\Program Files\VideoLAN\VLC\vlc" -I dummy -vvv %%a --sout=#transcode{vcodec=h264,vb=1024,acodec=mp4a,ab=192,channels=2,deinterlace}:standard{access=file,mux=ts,dst=%%a.mpg} vlc://quit

 @ECHO OFF
 REM ########################################################################
 REM # A Windows XP cmd.com script to batch convert m4a files to mp3.       #
 REM #                                                                      #
 REM # Copyright (C) 2008 Andrew Boden                                      #
 REM # (boden@graduate.uwa.edu.au)                                          #
 REM #                                                                      #
 REM # This program is free software: you can redistribute it and/or modify #
 REM # it under the terms of the GNU General Public License as published by #
 REM # the Free Software Foundation, either version 3 of the License, or    #
 REM # (at your option) any later version.                                  # 
 REM #                                                                      #
 REM # This program is distributed in the hope that it will be useful,      #
 REM # but WITHOUT ANY WARRANTY; without even the implied warranty of       #
 REM # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        #
 REM # GNU General Public License for more details.                         #
 REM #                                                                      #
 REM # You should have received a copy of the GNU General Public License    #
 REM # along with this program.  If not, see <http://www.gnu.org/licenses/>.#
 REM #                                                                      #
 REM # Version 1.0 (June 27th 2008)                                         #
 REM # Uses VideoLAN VLC 0.8.6h (www.videolan.org)                          #
 REM # Gracefully handles commas and apostrophes in file names.             #
 REM # Not aware of any other characters needing graceful handling.         #
 REM # 512kbps encoding with 44100 sampling.                                #
 REM ########################################################################
 
 FOR /R %%G IN (*.m4a) DO (CALL :SUB_VLC "%%G")
 FOR /R %%G IN (*.m4a.mp*) DO (CALL :SUB_RENAME "%%G")
 GOTO :eof
 
 :SUB_VLC
  SET _firstbit=%1
  SET _qt="
  CALL SET _newnm=%%_firstbit:%_qt%=%%
  SET _commanm=%_newnm:,=_COMMA_%
  REM echo %_commanm%
  CALL "C:\Program Files\VideoLAN\VLC\vlc" -I dummy -vvv %1 --sout=#transcode{acodec="mpga",ab="512","channels=2",samplerate="44100"}:standard{access="file",mux="mpeg1",dst="%_commanm%.mp3"} vlc://quit
 GOTO :eof
 
 :SUB_RENAME
  SET _origfnm=%1
  SET _endbit=%_origfnm:*.m4a=%
  CALL SET _newfilenm=%%_origfnm:.m4a%_endbit%=.mp3%%
  SET _newfilenm=%_newfilenm:_COMMA_=,%
  COPY %1 %_newfilenm%
  DEL %1
 GOTO :eof
 
 :eof
</syntaxhighlight></big></big>

The same as above, for vlc >= 0.9:
<big><big><syntaxhighlight lang="dos">
 @ECHO OFF
 FOR /R %%G IN (*.m4a) DO (CALL :SUB_VLC "%%G")
 FOR /R %%G IN (*.m4a.mp*) DO (CALL :SUB_RENAME "%%G")
 GOTO :eof
 
 :SUB_VLC
  SET _firstbit=%1
  SET _qt="
  CALL SET _newnm=%%_firstbit:%_qt%=%%
  SET _commanm=%_newnm:,=_COMMA_%
  REM echo %_commanm%
  CALL "C:\Program Files\VideoLAN\VLC\vlc" -I dummy -vvv %1 --sout=#transcode{acodec="mpga",ab="512","channels=2"}:standard{access="file",mux="raw",dst="%_commanm%.mp3"} vlc://quit
 GOTO :eof
 
 :SUB_RENAME
  SET _origfnm=%1
  SET _endbit=%_origfnm:*.m4a=%
  CALL SET _newfilenm=%%_origfnm:.m4a%_endbit%=.mp3%%
  SET _newfilenm=%_newfilenm:_COMMA_=,%
  COPY %1 %_newfilenm%
  DEL %1
 GOTO :eof
 
 :eof
</syntaxhighlight></big></big>

=== Windows 7 SendTo ===
This batch file allows to use the Windows SendTo context menue in Exlorer.
Copy the content in a file named MOV_to_MPG_Converter.bat and copy it to your SendTo directory (CMD SHELL:sendto)
<big><big><syntaxhighlight lang="dos">

 @ECHO OFF
 rem ***********************************************************************
 rem * MOV to MPG batch converter. (2014-09-29 Sinx)                       *
 rem *                                                                     *
 rem * For installation just copy batch file to SendTo directory.          *
 rem * On Win8 execute "SHELL:sendto" to go to Sendto folder.              *
 rem *                                                                     *
 rem * I got quite good compression rations with these parameters:         *
 rem * vcodec=h264      codec used                                         *
 rem * vb=10000         video bandwidth                                    *
 rem * deinterlace=1    rebuild full pictures from keyframes and diffs.    *
 rem * acodec=mp3       audio codec                                        *
 rem * ab=128           128kbps mp3 quality                                *
 rem * channels=2       stereo                                             *
 rem *                                                                     *
 rem * for parameters see                                                  *
 rem * http://www.videolan.org/doc/vlc-user-guide/de/ch04.html             *
 rem ***********************************************************************
 echo **********************************************************************
 echo MOV to MPG VLC batch converter called: %0 %1 %2 %3 %4 %5 %6 %7 %8
 echo **********************************************************************
 echo.
 echo For installation, just copy batch file to SendTo folder..
 echo.
 
 SET _new_extention=mpg
 
 :start
 if "%~1"=="" (call goto :the_end)
 CALL :SUB_CONVERT %1
 SHIFT
 goto :start
 
 
 :SUB_CONVERT
 SET _orig_path=%~1
 rem SET _orig_extention=%_orig_filename:*.=%
 echo %_orig_path%
 SET _orig_extention=%_orig_path:*.=%
 CALL SET _new_path=%%_orig_path%:.%_orig_extention%=.%_new_extention%%%
 set _new_path="%_new_path%"
 echo.
 echo Converting %1 ======TO===== %_new_path% ...
 echo.
 
 if exist "%ProgramFiles%\VideoLAN\VLC\vlc.exe" (
 SET _vlc_path="%ProgramFiles%\VideoLAN\VLC\vlc"
 ) else (
 SET _vlc_path="%ProgramFiles(x86)%\VideoLAN\VLC\vlc"
 )
 
 CALL %_vlc_path% -I dummy -vvv %1 --sout=#transcode{vcodec=h264,vb=10000,deinterlace=1,acodec=mp3,ab=128,channels=2,samplerate=44100}:standard{access=file,mux=ts,dst=%_new_path%} vlc://quit
 GOTO :eof
 
 :the_end
 echo **********************************************************************
 echo * FINISHED                                                           *
 echo **********************************************************************
 pause
</syntaxhighlight></big></big>

=== Powershell ===
<big><big><syntaxhighlight lang="powershell">    
    $outputExtension = ".mp3"
    $bitrate = 160
    $channels = 2
    
    foreach($inputFile in get-childitem -recurse -Filter *.wav)
    { 
      $outputFileName = [System.IO.Path]::GetFileNameWithoutExtension($inputFile.FullName) + $outputExtension;
      $outputFileName = [System.IO.Path]::Combine($inputFile.DirectoryName, $outputFileName);
      
      $programFiles = ${env:ProgramFiles(x86)};
      if($programFiles -eq $null) { $programFiles = $env:ProgramFiles; }
      
      $processName = $programFiles + "\VideoLAN\VLC\vlc.exe"
      $processArgs = "-I dummy -vvv `"$($inputFile.FullName)`" --sout=#transcode{acodec=`"mp3`",ab=`"$bitrate`",`"channels=$channels`"}:standard{access=`"file`",mux=`"wav`",dst=`"$outputFileName`"} vlc://quit"
      
      start-process $processName $processArgs -wait
    }
</syntaxhighlight></big></big>
    
=== Unix / Linux ===
Transcodes all files in current directory (except hidden files), saving with suffix <code>.transcoded</code>.

<syntaxhighlight lang="bash">
 #!/bin/sh                                                                                                                                                     
 ######################## Transcode the files using ... ########################
 vcodec="mp4v"
 acodec="mp4a"
 vb="1024"
 ab="128"
 mux="mp4"
 ###############################################################################
 
 # Store path to VLC in $vlc
 if command -pv vlc >/dev/null 2>&1; then
     # Linux should find "vlc" when searching PATH
     vlc="vlc"
 else
     # macOS seems to need an alias
     vlc="/Applications/Utilities/VLC.app/Contents/MacOS/VLC"
 fi
 # Sanity check
 if ! command -pv "$vlc" >/dev/null 2>&1; then
     printf '%s\n' "Cannot find path to VLC. Abort." >&2
     exit 1
 fi
 
 for filename in *; do
     printf '%s\n' "=> Transcoding '$filename'... "
     "$vlc" -I dummy -q "$filename" \
        --sout '#transcode{vcodec="$vcodec",vb="$vb",acodec="$acodec",ab="$ab"}:standard{mux="$mux",dst="$filename.transcoded",access=file}' \
        vlc://quit
     ls -lh "$filename" "$filename.transcoded"
     printf '\n'
 done
</syntaxhighlight>

The wildcard <code>*.transcoded</code> will select all of the transcoded files for group operations.

To move files:
<syntaxhighlight lang="bash">
mv *.transcoded <directory>
</syntaxhighlight>
To remove all filename extensions (including <code>.transcoded</code>):
<syntaxhighlight lang="bash">
for filename in *.transcoded; do mv "$filename" "${filename%%.*}"; done
</syntaxhighlight>
To remove all filename extensions and replace with another (e.g. <code>.mp3</code>):
<syntaxhighlight lang="bash">
for filename in *.transcoded; do mv "$filename" "${filename%%.*}.mp3"; done
</syntaxhighlight>