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• Can't install FFMPEG on OS X Mavericks

  15 novembre 2013, par CristianOrellanaBak

  I have an error when install FFMPEG through homebrew on OS X Mavericks running this command brew install ffmpeg :

  Error: ffmpeg dependency x264 was built with the following
  
  C++ standard library: libstdc++ (from clang)
  
  
  
  This is incompatible with the standard library being used
  
  to build ffmpeg: libc++ (from clang)
  
  
  
  Please reinstall x264 using a compatible compiler.
  
  hint: Check https://github.com/mxcl/homebrew/wiki/C++-Standard-Libraries

  The complete history is : I has installed FFMPEG on Mountain Lion (that worked fine), but when upgrade it to Mavericks, FFMPEG fails to create an video in my Ruby on Rails app : Ruby on Rails : FFMPEG fails after upgrade Mountain Lion to Mavericks

  Some idea or recommendation ??

  Thank you very much !

• ffmpeg to cut beginning and fade in audio

  31 juillet 2024, par cannyboy

  I've got a bunch of spoken word mp3 files, which all have the same intro talking and music, and then the real content begins. So it goes roughly like this :

  


  00:00 Standard intro spoken word
00:20 Standard intro music
00:35 The content


  


  The timings are not always the same (can vary by 5 secs). So I'd to cut the first 25 seconds and then fade in the next five seconds. And then output the file in the same mp3 format. Is this possible with ffmpeg ?

  


• Windows batch - unable to assign a variable within an iterative for loop

  17 janvier 2024, par user23254772

  I am using ffprobe to get the codec_name of subtitles in media files. But when I try to get the codec extension it fails. What am I doing wrong ?

  


  I have edited this post to address the comments and include the complete batch file

  


  Re : ns.txt - this command outputs the stream number of the subtitles :

  


  C:\ffmpeg\bin\ffprobe -loglevel error -select_streams s -show_entries stream=index:stream_tags=language -of csv=p=0 -i "%~dpnx1">ns.txt


  


  and the output in the txt file is :

  


  2
3


  


  Now I need to count the number of lines in this text file which will tell me how many subtitles my media file has :

  


  set "cmd=findstr /R /N "^^" ns.txt | find /C ":""
for /f %%a in ('!cmd!') do set nums=%%a
set /A nums=%nums%-1


  


  In this case nums = 2 but in ffprobe the first subtitle is s:0, so I subtract 1 from nums

  


  My iterative loop is :

  


  FOR %%i in (1,1,%nums%) DO (
C:\ffmpeg\bin\ffprobe.exe -v quiet -select_streams s:%%i -show_entries stream=%arg% -of default=noprint_wrappers=1:nokey=1 -i "%~dpnx1" >sub.txt
set /p codecs=code>

  


  Which puts the codec name in sub.txt and I create the variable codecs to store this value.

  


  Then I need to determine the appropriate container [extension] for the subtitle - here I changed my code from what I posted earlier :

  


  if !codecs! == mov_text set codecs1=srt
if !codecs! == subrip set codecs1=srt
if !codecs! == ass set codecs1=ass
if !codecs! == webvtt set codecs1=vtt
if !codecs! == ttml set codecs1=ttml
if !codecs! == dvb_subtitle set codecs1=dvbsub
if !codecs! == dvd_subtitle set codecs1=dvdsub
if !codecs! == hdmv_pgs_subtitle setcodecs1=sup
if !codecs! == xsub set codecs1=xsub


  


  Then I demux [extract] the subtitle using ffmpeg :

  


  c:\ffmpeg\bin\ffmpeg -i "%~dpnx1" -an -vn -c:s "!codecs!" "%~n1_d."!codecs1!"


  


  This is working, except I have an extra iteration, my output is :

  


  Mediafile: C:\Users\UNOIT\Desktop\Tears of Steel_2sub.mkv
subtile: Tears of Steel_2sub_d.srt
subtile: Tears of Steel_2sub_d.ass
subtile: Tears of Steel_2sub_d.ass
File 'Tears of Steel_2sub_d.ass' already exists. Overwrite? [y/N]


  


  And if the media file has only one subtitle, my ffmpeg output is :

  


  Mediafile: C:\Users\UNOIT\Desktop\_Jan2024-Media\mkv\Tears of Steel_ass.mkv
subtile: Tears of Steel_ass_d.ass
subtile: Tears of Steel_ass_d.ass
File 'Tears of Steel_ass_d.ass' already exists. Overwrite? [y/N]
subtile: Tears of Steel_ass_d.ass
File 'Tears of Steel_ass_d.ass' already exists. Overwrite? [y/N]


  


  I can choose not to overwrite the file - but obviously there is a problem with my iterative loop - maybe a subroutine would work

  


  Here is the batch file :

  


  ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION
set "arg=codec_name"
set "arg1=codec_name"
set "arg2=codec_name"
echo Mediafile: %~dpnx1
C:\ffmpeg\bin\ffprobe -v quiet -loglevel error -select_streams s -show_entries stream=index:stream_tags=language -of csv=p=0 -i "%~dpnx1" >ns.txt
set "cmd=findstr /R /N "^^" ns.txt | find /C ":""
for /f %%a in ('!cmd!') do set nums=%%a
set /A nums=%nums%-1
FOR %%i in (0,1,%nums%) DO (
    C:\ffmpeg\bin\ffprobe.exe -v quiet -select_streams s:%%i -show_entries stream=%arg% -of default=noprint_wrappers=1:nokey=1 -i "%~dpnx1" >sub%%i.txt
    set /p codecs=code>