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• Trim .wav file combining sox, ffmpeg in a windows batch script

  20 février 2020, par pbc278

  I need to trim 300 .wav files to be a specific sample-length (x times 1152 samples)
  So if a .wav file is 1727821 samples in length (sox --i -s xx.wav) = 1727821.

  I need to divide the outcome of the sox command by 1152 (1727821/1152 = 1499,844...)

  Then I need to use the outcome (1499 without decimals) and multiply it by 1152 (1499*1152=1726848)

  Then I need to trim the sample with ffmpeg to that outcome

  ffmpeg -i xx.wav -af atrim=end_sample=1726848

  How do I do this in a batch file ?

  in pseudo code something like

  FOR %%i IN (*.*) DO (
  
  
  
    @set sample_length = (sox --i -s %%~ni.wav)
  
    @set multiplier = %sample_length% / 1152
  
    @set new_samplelength = %multiplier% * 1152
  
    ffmpeg -i %%~ni.wav -af atrim=end_sample=%new_samplelength%
  
  
  
  )

  I can’t find anything understandable on how to combine all these different tools in one batch script

• Removing file in windows batch script not working

  13 février 2020, par BluePrint

  I’m trying to create a batch script for trimming 25 seconds from the beginning of all mp4 files in a folder. The batch script is located in the same folder as the files, and there is a folder called trimmed in the same folder. This is my script so far :

  @echo off
  
  setlocal DisableDelayedExpansion
  
  
  
  :promptdel
  
  set /p delorig=Delete original file (default no)? [Y/N]: 
  
  
  
  if not defined delorig (
  
    set delorig=N
  
  )
  
  
  
  set "vartwo="&for /f "delims=YNyn" %%i in ("%delorig%") do set vartwo=%%i
  
  
  
  if defined vartwo (
  
    echo Please state Y or N!
  
    goto :promptdel
  
  )
  
  
  
  for %%a in ("*.mp4") do (
  
    echo Starting %%a
  
  
  
    rem "Need to rename since file names may contain whitespaces"
  
    ren "%%a" "working.mp4"
  
    ffmpeg -loglevel panic -hide_banner -i "working.mp4" -ss 00:00:25.000 -c:v copy -c:a copy "trimmed\%%a"
  
    ren "working.mp4" "%%a"
  
  
  
    echo %delorig%
  
    if %delorig% == "Y" (del "%%a" /f /q)
  
    if %delorig% == "y" (del "%%a" /f /q)
  
  
  
    echo %%a finished!
  
  )
  
  
  
  pause

  My problem is that the original file does not get removed regardless of if I input y/Y or n/N. What am I doing wrong ?

• Windows - FFmpeg - How to map a jpg file to video stream 0:0 and include only audio stream 0:2 and not stream 0:1 and 0:2 together

  21 juin 2020, par slyfox1186

  I am trying to write a batch script that begins by extracting a thumbnail "Cover.jpg" from an mkv video. My end goal is to have this script recursively loop a folder full of videos to encode them all in one go.

  



  :: create cover art jpg
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)


  



  Then I am trying to encode the 4K mkv video that I got the jpg thumbnail from to 1920x1080 resolution instead of it's native 4K to make it easier to play back on my home plex server.

  



  I have surround sound 6 channel speaker system so I want to take audio stream 0:2 which is Dolby DTS 6 channel and save some HDD space by converting it to -c:a ac3 -b:a 640k -ac 6.

  



  I have gotten stuck because I can achieve everything I want except I keep encoding 2 of the 4 audio streams available in the end. I only want to keep 1 audio stream to maximize my space savings.

  



  Here is the entire script so far.

  



  @echo off
setlocal enabledelayedexpansion
prompt $g
color 0a

pushd "%~dp0"

set FF=C:\MAB\local64\bin-video\ffmpeg.exe
set TITLE=MOVIETITLE

:: create cover art jpg file
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)

:: run ffmpeg x265
for %%I in (*.mkv) do (
set fname="%%~nxI"
set fout="%%~nI-temp.mkv"
call :runff !fname! !fout!
del /s /q *.jpg
pause
goto:eof
)

:runff
%FF% -ss 0 ^
-y ^
-i "%~1" ^
-attach "Cover.jpg" ^
-map_metadata 0 ^
-map_chapters 0 ^
-metadata title="%TITLE%" ^
-map 0:0 -metadata:s:v:0 language=eng ^
-map 0:2 -metadata:s:a:0 language=eng -metadata:s:a:0 title="Surround 5.1 (DTS)" ^
-map 0:3 -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" -metadata:s:t:0 filename="Cover.jpg" -metadata:s:t:0 mimetype="image/jpeg" ^
-c:v libx265 -preset medium ^
-x265-params crf=18:qcomp=0.8:aq-mode=1:aq_strength=1.0:qg-size=16:psy-rd=0.7:psy-rdoq=5.0:rdoq-level=1:merange=44 ^
-c:a ac3 -b:a 640k -ac 6 ^
-t 3 ^
"%~2"
exit /b


  



  Here are the output logs. https://pastebin.com/hVMy3VJW

  



  You can see towards the bottom that it is encoding both audio streams.

  



  Any ideas guys ?