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• Why the result of FFmpeg capture process has no audio to create a webm file ?

  23 mars 2019, par RAM

  The result of my bellow FFmpeg command has no audio (is silent) :

  ffmpeg -f gdigrab -framerate 30 -i desktop -video_size 720x480 -c:v libvpx-vp9 -c:a libopus -b:v 1M -b:a 128K -auto-alt-ref 0 -crf 10 -preset ultrafast output.webm

  But this one has audio :

  ffmpeg -f gdigrab -i desktop -f dshow -i audio="Microphone (4- High Definition Audio Device)" output.mkv

  • How should I capture as webm file by using libopus or libvorbis ?
  • What is the problem in my first command ?

  ---

  My FFmpeg version :

  ffmpeg version N-93439-gb073fb9eea Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20190212
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg 
  
                   --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab 
  
                   --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 26.100 / 56. 26.100
  
    libavcodec     58. 47.105 / 58. 47.105
  
    libavformat    58. 26.101 / 58. 26.101
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 48.100 /  7. 48.100
  
    libswscale      5.  4.100 /  5.  4.100
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100

• Converting .aif to mp3 using pydub

  22 mars 2019, par Nick Wetaski

  I want to convert a bunch of music files located on my desktop (however trying to convert just one of them is the first step) from .aif to .mp3 however I am receiving an error code 1 from ffmpeg.

  I have ffmpeg and pydub installed

  Code :

  from os import path
  
  from pydub import AudioSegment
  
  from pydub.utils import which
  
  
  
  AudioSegment.converter = which("ffmpeg")
  
  
  
  aif_audio = AudioSegment.from_file("C:/Users/Nick/Desktop/scratch/landonmusic1.aif", format="aif")
  
  
  
  aif_audio.export("C:/Users/Nick/Desktop/scratch/landonmusic1.mp3", format="mp3")

  I am receiving the following feedback from Python Terminal :

  S C:\Users\Nick\OneDrive\ProgrammingProjects> & C:/Users/Nick/AppData/Local/Programs/Python/Python37-32/python.exe c:/Users/Nick/OneDrive/ProgrammingProjects/Classes/MusicFileConverter.py
  
  Traceback (most recent call last):
  
    File "c:/Users/Nick/OneDrive/ProgrammingProjects/Classes/MusicFileConverter.py", line 10, in <module>
  
      aif_audio = AudioSegment.from_file("C:/Users/Nick/Desktop/scratch/landonmusic1.aif", format="aif")
  
    File "C:\Users\Nick\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pydub\audio_segment.py", line 704, in from_file
  
      p.returncode, p_err))
  
  pydub.exceptions.CouldntDecodeError: Decoding failed. ffmpeg returned error code: 1
  
  </module>

  Output from ffmpeg/avlib :

  b"ffmpeg version N-93431-g6dc1da416e Copyright (c) 2000-2019 the FFmpeg developers\r\n  built with gcc 8.2.1 (GCC) 20190212\r\n  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt\r\n  libavutil      56. 26.100 / 56. 26.100\r\n  libavcodec     58. 47.105 / 58. 47.105\r\n  libavformat    58. 26.101 / 58. 26.101\r\n  libavdevice    58.  7.100 / 58.  7.100\r\n  libavfilter     7. 48.100 /  7. 48.100\r\n  libswscale      5.  4.100 /  5.  4.100\r\n  libswresample   3.  4.100 /  3.  4.100\r\n  libpostproc    55.  4.100 / 55.  4.100\r\nUnknown input format: 'aif'\r\n"

• FFmpeg commands work for root only(centos 6.10)

  20 mars 2019, par Prashant Hanamghar

  I have dedicated server. I have installed FFmpeg on my root. All commands related to FFmpeg works if I logged in as root but no command is working if I logged in as user. I have tried adding one user to sudoers also. Also I want to use FFmpeg commands in PHP shell_exec() or exec(). Can someone tell me the solution. Thanks in advance.

  user command :

  $ ffmpeg

  output :

  -bash: ffmpeg: command not found

  root command :

  $ ffmpeg

  output

  ffmpeg version N-93394-g14eea7c Copyright (c) 2000-2019 the FFmpeg 
  
  developers
  
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-23)
  
  configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static -- 
  
  extra-cflags=-I/root/ffmpeg_build/include -
  
  -extra-ldflags=-L/root/ffmpeg_build/lib --extra-libs=-lpthread --extra- 
  
  libs=-lm --bindir=/root/bin --enable-gpl --enab
  
  le-libfdk_aac --enable-libfreetype --enable-libmp3lame --enable-libopus -- 
  
  enable-libvpx --enable-libx264 --enable-libx
  
  265 --enable-nonfree
  
  libavutil      56. 26.100 / 56. 26.100
  
  libavcodec     58. 47.103 / 58. 47.103
  
  libavformat    58. 26.101 / 58. 26.101
  
  libavdevice    58.  6.101 / 58.  6.101
  
  libavfilter     7. 48.100 /  7. 48.100
  
  libswscale      5.  4.100 /  5.  4.100
  
  libswresample   3.  4.100 /  3.  4.100
  
  libpostproc    55.  4.100 / 55.  4.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] 
  
  outfile}...
  
  
  
  Use -h to get full help or, even better, run 'man ffmpeg'