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• Replace Special Characters In Batch-File Variable Feeding ffmpeg program

  14 janvier 2019, par whereswaller

  I am attempting to write a batch-file that leverages ffmpeg.exe to convert all files in a folder structure to mp3 format (specifically 128 KBps).

  My batch-file is presently unable to process filenames (constructed by concatenating the %_SOURCE% and %%~F variables) containing certain special characters generating the following errors :

  No such file or directory

  • … ellipsis sign
  • – en dash
  • — em dash
  • − minus sign

  Invalid argument

  • ‘ and ’ curved single quotation marks
  • “ and ” curved double quotation marks

  Invalid argument (yet sometimes passes depending on where symbol is in the filename, for example, seems to work if placed between the n and t of Dont in C:\Users\Test\Documents\Input\Peter Bjorn And John - I Know You Dont Love Me.mp3)

  • - hyphen
  • ! exclamation mark
  • ~ tilde
  • ' non-curved single quotation mark
  • = equals sign
  • + plus sign
  • % percentage sign
  • ( open bracket

  How can I modify my batch-file script so that the %%~F variable escapes these characters correctly ?

  Example current filename input : C:\Users\Test\Documents\Input\Peter Bjorn And John - I Know You Don't Love Me.mp3

  Example desired filename input : C:\Users\Test\Documents\Input\Peter Bjorn And John - I Know You Don"^'"t Love Me.mp3

  Script (see line beginning C:\ffmpeg\bin\ffmpeg.exe) :

  @echo off
  
  setlocal EnableExtensions DisableDelayedExpansion
  
  
  
  rem // Define constants here:
  
  set "_SOURCE=C:\Users\Test\Documents\Input" & rem // (absolute source path)
  
  set "_TARGET=C:\Users\Test\Documents\Output"  & rem // (absolute target path)
  
  set "_PATTERN=*.*" & rem // (pure file pattern for input files)
  
  set "_FILEEXT=.mp3"   & rem // (pure file extension of output files)
  
  
  
  pushd "%_TARGET%" || exit /B 1
  
  for /F "delims=" %%F in ('
  
      cd /D "%_SOURCE%" ^&^& ^(rem/ list but do not copy: ^
  
          ^& xcopy /L /S /Y /I ".\%_PATTERN%" "%_TARGET%" ^
  
          ^| find ".\" ^& rem/ remove summary line;
  
      ^)
  
  ') do (
  
      2> nul mkdir "%%~dpF."
  
  
  
      rem // Set up the correct `ffmpeg` command line here:
  
      set "FFREPORT=file=C\:\\Users\\Test\\Documents\\Output\\ffreport-%%~F.log:level=32"
  
      "C:\ffmpeg\bin\ffmpeg.exe" -report -n -i "%_SOURCE%\%%~F" -vn -c:a libmp3lame -b:a 128k "%%~dpnF%_FILEEXT%"
  
      if not errorlevel 1  if exist "%%~dpnF%_FILEEXT%" del /f /q "%_SOURCE%\%%~F"
  
  
  
  )
  
  popd
  
  
  
  endlocal
  
  pause

• Ffmpeg converting to HLS - video extremely low quality

  7 janvier 2019, par John Kim

  I’m building a streaming webapp that uses FFMPEG. The client sends webcam video using FFMPEG (converting the webm stream into mpeg-ts in the process) over RTMP, and the media server receives the mpeg-ts stream, transcodes it into HLS with multiple quality levels for ABR (using a master playlist).

  So far, I’ve got all of this working, except that my transcoding command creates HLS segments that are extremely low quality ; the video is very pixellated, and the best quality level (1080p) just looks like 240p scaled up to 1080p. In order to test my FFMPEG command I remuxed a sample high quality 1080p movie into mpeg-ts (I checked the quality, it looks the same as the original), and I’m using this command to transcode this movie into HLS for the test :

  ffmpeg.exe -threads 4 -filter_complex_threads 4 -vsync 1 -i output.ts -filter_complex 
  
  "[v:0]split=5[s0][s1][s2][s3][s4]; 
  
  [s0]scale=w=1920:h=1080:flags=lanczos,yadif[v0];
  
  [s1]scale=w=1280:h=720:flags=lanczos,yadif[v1];
  
  [s2]scale=w=854:h=480:flags=lanczos,yadif[v2];
  
  [s3]scale=w=480:h=360:flags=lanczos,yadif[v3];
  
  [s4]scale=w=426:h=240:flags=lanczos,yadif[v4]" 
  
  -map "[v0]" -pix_fmt yuv420p -r 23.976 -vcodec libx264 -b:v 3400k -preset medium -profile:v baseline -keyint_min 24 -g 48 -x264opts no-scenecut -strict experimental -map_metadata -1 
  
  -map "[v1]" -pix_fmt yuv420p -r 23.976 -vcodec libx264 -b:v 1725k -preset medium -profile:v baseline -keyint_min 24 -g 48 -x264opts no-scenecut -strict experimental -map_metadata -1 
  
  -map "[v2]" -pix_fmt yuv420p -r 23.976 -vcodec libx264 -b:v 960k -preset medium -profile:v baseline -keyint_min 24 -g 48 -x264opts no-scenecut -strict experimental -map_metadata -1 
  
  -map "[v3]" -pix_fmt yuv420p -r 23.976 -vcodec libx264 -b:v 510k -preset medium -profile:v baseline -keyint_min 24 -g 48 -x264opts no-scenecut -strict experimental -map_metadata -1  
  
  -map "[v4]" -pix_fmt yuv420p -r 23.976 -vcodec libx264 -b:v 320k -preset medium -profile:v baseline -keyint_min 24 -g 48 -x264opts no-scenecut -strict experimental -map_metadata -1 
  
  -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -c:a aac -b:a 96k -af “aresample=async=1:min_hard_comp=0.100000:first_pts=0” 
  
  -f hls -var_stream_map "v:0,a:0 v:1,a:1, v:2,a:2, v:3,a:3, v:4,a:4" 
  
  -hls_wrap 24 -hls_time 10 -master_pl_name master.m3u8 "C:/Users/John/Desktop/ffmpeg-20181218-978c935-win64-static/bin/vs%v/manifest.m3u8"

  I’m very new to FFMPEG, I referred to this article for the video options, and modified it to create HLS instead of mp4. Needless to say I botched this up pretty bad, although the command itself works and does what I need it to (other than the crappy quality). Could anyone help me optimize this command to make it transcode much less lossy video ?

• Is it possible to vertically rotate a showwaves (or showfreqs) overlay using ffmpeg ?

  5 février 2019, par Introspectre

  I wish to take a showwaves (or showfreqs) overlay and center it vertically using ffmpeg, e.g.

  ffmpeg -i input.mp3 -filter_complex "[0:a]showspectrum=color=fiery:saturation=2:slide=scroll:scale=log:win_func=gauss:overlap=1:s=960x1080,pad=1920:1080[vs]; [0:a]showspectrum=color=fiery:saturation=2:slide=rscroll:scale=log:win_func=gauss:overlap=1:s=960x1080[ss]; [0:a]showwaves=s=1920x540:colors=B80000|950000|690000:mode=p2p,inflate[sw]; [vs][ss]overlay=w[out]; [out][sw]overlay=0:(H-h)/2[out]" -map "[out]" -map 0:a -c:v libx264 -preset fast -crf 18 -c:a copy output.mkv

  

  As shown above, the showwaves output is centered horizontally. But would it also be possible to have it centered vertically ? Specifically, using a single -filter_complex command argument ?

  I’ve looked through the ffmpeg manual and searched stackoverflow for an answer, but to no avail.