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• 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>

  


• How to do this in batch-file for multiple files video and audio with ffmpeg ?

  11 août 2023, par alexdo

  Can someone help me creating a for loop for mutiple video files and audio in directory structure ?

  


  @ECHO OFF
Setlocal EnableDelayedExpansion
set INPUT=D:\Shorts\code\INPUT
set OUTPUT=D:\Shorts\code\OUTPUT

:: encode video:

for %%a in ("%INPUT%\*.*") DO ffmpeg -i "%%a" -i music.mp3 -c:v copy -map 0:v -map 1:a -map_metadata -1 -y -preset superfast "%output%\%%~na.mp4"

pause


  


  

  


  This works good for one audio, but I'm lost how to do this in batch file for multiple files ramdom audio.

  


• avcodec/nvenc : surface allocation reduction

  25 avril 2017, par Ben Chang

  avcodec/nvenc : surface allocation reduction
  This patch aims to reduce the number of input/output surfaces
  
  NVENC allocates per session. Previous default sets allocated surfaces to 32
  
  (unless there is user specified param or lookahead involved). Having large
  
  number of surfaces consumes extra video memory (esp for higher resolution
  
  encoding). The patch changes the surfaces calculation for default, B-frames,
  
  lookahead scenario respectively.
  The other change involves surface selection. Previously, if a session
  
  allocates x surfaces, only x-1 surfaces are used (due to combination
  
  of output delay and lock toggle logic). To prevent unused surfaces,
  
  changing surface rotation to using predefined fifo.
  Signed-off-by : Timo Rothenpieler <timo@rothenpieler.org>
  

  • [DH] libavcodec/nvenc.c
  • [DH] libavcodec/nvenc.h
  • [DH] libavcodec/nvenc_h264.c
  • [DH] libavcodec/nvenc_hevc.c